-
Ent. Rev. Japan, 63 (2): 109-120, December25, 2008
New or Little-known Tenebrionid Species(Coleoptera) from
Japan(7) Revisional Study of Borboresthes(Tenebrionidae:
AIIeculinae) Species
from the Ryukyu Islands
Katsumi AKITA
Hisai-iba-cho66, D-304, Tsu City, Mie Pref.,514-1108 Japan
an d
Kimio MAsUMoT0
Institute of Human Culture Studies, 0tsuma Women's
University,Tokyo,102-8357 Japan
Abst rac t A11eculine Bo,・bo,・esthes species from the Ryukyu
Islands are re-examined. Twonamed species, orbo''esf/1es a加 'e'Isis
MAEDA et NAKANE and o''00''esr/1es ama'malulsM AEDA et NAKANE are
re-recorded from their original localities, and newly recorded
fromIriomote-jima Is., and Okinoerabu-jima Is.、 respectively. Four
new species are described:Bo,・bo,・est/1es htra11 sp nov.. B
ki,ml1・al sp nov., B oil,no,1101 sp n o v and B. nakanei sp n o v
.A key to all the species from these islands is also provided.
This is the seventh part of the new or little-known tenebrionid
species from Japan, and dealswith a revisional study of
Borbolesthes(Alleculinae: Tenebrionidae) species from the
RyukyuIslands.
MIYATAKE(1985) illustrated two species of this genus only from
the main islands of Japan(included Tsushima Is). Just a few years
later, MAEDA and NAKANE(1988) described two newspecies,
Borbo,esthes amamianus from Amami-oshima Is., and B kabirensis from
Ishigaki-jjma Is., respectively. SAsAJl (1989) enumerated only B
fulginosus from the Ryukyu Islands(Yaeyama Islands). AzUMA et a1.
(2002) listed two species, B amamlanus and B tut9mosuSkabjrensls
from the Ryukyu Islands. FromIriomote-j ima Is. of the Ryukyu
Islands, MIWA(1g33) recorded a problematic species B fttlgtnosus
originally described from Sze-tChOuen(chjna) presumably, jt must be
a misidentification of one of the species from the RyukyuIslands to
be mentioned in this paper.
Before gojng further in details, the authors wish to express
cordial thanks to Mess「S the lateIsamu HIRAl (Sajtama), Satoshi
INADA(Okinawa), the late Atsuo IZUMI (Tokyo),
Hi「emuKAMEzAwA(Tokyo), Tatsunosuke KIMoT0(Tokyo), Masaaki
KIMURA(Okinawa), Sadahi「oOHMoM0(Ibaragj), Hjdehiro
ONoDERA(Ibaragi), Hiroshi OTOBE(Mie), TakaShi SHIMADA(shjzuoka),
for offering the type materials. The authors also appreciate D「.
MakOto KluCHI,Tsukuba City for his taking the photographs inserted
in the Present PaPe「.
-
110 Katsumi AKITA and Kimio MAsUMoTo
The ho1otypes will be deposited in the collection of the
National Museum for Nature andScience, Tokyo (NSMT).
Borboresthes kabirensis MAEDA et NAKANE, 1988
[Japanese name: Ishigaki-tobiiro-kuchikimushi](Figs. 1,7, 13 and
19)
Bo,-bo,esthes kabi,-ensis MAEDA et NAKANE, 1988, Rev. Miyazaki
Sangyo-keiei Univ., 1: 6 (Kabira,Ishigaki Is ).
Specimens examined. Ishigaki-jima Is: 1 (Fig. l ), 1 早, emote,
17. V 2000, 1. HIRAI leg; 1 早,Mt.0moto-dake,100-525m,6. V.1993, K.
AKITA leg;1 早, ditto,20. IV. l993, K. AKITA leg;1 (11、, ditto,6.
V.1994, H. 0ToBEleg; l 早, ditto,29. V.1992, H. KAMEzAwAleg;1 ,
ditto, 1-7. V. 1994, H. 0TOBEleg;2早早, Mt. Yarabu-dake,20-180m,1.
V.1993, K. AKITA leg; l 早, ditto,1-7. V.1994, H.0ToBEleg ; 1 l ,
ditto,5-8. V.1994, H. 0ToBEleg; 1 早, Hirakubo,14. IV.1998, C. END0
leg;1 早, Mt.Buzama-dake,17. IV.1998, S. 0HMoM01eg;1 早, Shiramizu,5.
V.1994, H.0ToBEleg;2早早, Takeda,17. IV. 1993, H. 0NoDERA leg ; 1 , 1
, Yonehara, 23. V. 1973, T. NAKANE leg. (NSMT-I-C 44827,44832);1
(i'、, ditto,9. VI.1982, A. IzuMl leg; Iriomote-jima Is:2早早,
Aira-gawa Riv.,4. V 2003, H.OToBEleg; 1 (11、, ditto,28. IV 2003, T.
KURIHARAleg;1 (11、, Gunkan'iwa- Kampira-no-taki, 3. V. 1995,H.
KAMEzAwAleg; 1 , Sonai-dake, l8. V 2000, 1. HIRAl leg;1 早,
Urauchi-gawa Riv.,19. V 2001, T.SHIMADAleg; 1 , Shirahama, 4. V
2003, J. 0KAMURAleg.
Distributior1. Ishigaki-j ima Is., Iriomote-j ima Is. [New
Record].
Borboresthes amamianus MAEDA et NAKANE, 1988[Japanese name:
Amami-tobiiro-kuchikimushi]
(Figs 2,8,14 and20)
Borbo'esthes a'na'nianus MAEDA et NAKANE, 1988, Rev. Miyazaki
Sangyo-keiei Univ., 1 : 5 (AmamiOshima).
Specimens examined. Amami-oshima Is: 1 (11、 (Fig. 2), Kominalo,
5 m,2-9. V. 1999, K. AKITA leg1 早, ditto, 21. V 2007, H. 0ToBEleg;
0kinoerabu-jima Is: 1 , Mt. 0o-yama, China_oho, 22_23. v1993, 1.
HIRAl leg.
Distribution. Amami-oshima Is.,0kinoerabu-jima Is. [New
Record].
Borboresthes hiraii sp n o v.[Japanese name:
Hirai-tobiiro-kuchikimushi]
(Figs 3,9,15, 21)
Body eton9ate-elliptical, moderately convex dorsad; dark reddish
brown to dark yellowishb「own, head eXCludin9 apical part, pronotoum
and elytra dark grayish brown, scutellum lighterin Co1ou「, apical
Part of head, mouth parts, antennae and legs brownish yellow, hairs
on dorsalSu「face yellow with feeble brownish tinge; dorsal surface
weakly, rather serjceously shjnjng,
-
Bo,-bo,-est/1es from the Ryukyu Islands
4 6Figs. l -6. Bo,-bo,-esthes spp. . habi tus. - l , B.
kab1,-ensls MAEDA et NAKANE: 2、 B a11lanl ian lls MAEDA et
NAKANE:3. B. /111・ail sp nov.. hOlOtype:4. B. kl1川l''at sp nov.,
hOlOtype: 5、 B. 0/1'110'not Sp nov., hOlotype;6, B. nakane1 sp
nov., holotype. Scale =5 mm
prosternum hardly shining, metasternum and abdomen gently,
somewhat vitreously shining;dorsal surface rather densely clothed
with decumbent long hairs; ventral surface rather denselyclothed
with decumbent hairs.
Head subtrapezoida1 and rather flat, closely punctate and
clothed with fine and rather longhajrs, the punctures often
confluent with one another in anterior part; clypeus subquadrate,
notdefjned from frons, with apical part produced, feebly narrowed
anteriad and truncate in front;genae(areas before eyes) rather
small, subtriangular, hardly produced laterad, weakly raised
inmjddle, almost impunctate; frons feebly convex, weakly inclined
anteriad; areas near eyes gen-tly depressed, with rows of punctures
along eyes. Eyes transversely subreniform in dorsal view,gently
convex exteriad, with interior parts comparatively narrowly inlaid
into head. Antennaefiliform, reaching basal 2/5of elytra, ratio of
the length of each segment from base to apex:0.3 6. 0.16. 0.54. 0 .
63, 0.57, 0.50, 0.48, 0.49, 0 . 45, 0.50, 0 .48.
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l l2 K atsumi A iaTA and K imio M AsUMoTo
P ronotum subtrapezoida1 in dorsal view, very closely, somewhat
umbilicately punctate,covered with fine hairs; apex roundly
produced anteriad, finely rimmed in lateral parts; basewholly
margined, weakly produced in medial part, feebly emarginate in
front of scutellum,rather noticeably sinuous on each side; front
angles rounded but not seen from above, hindangles feebly angulate
in dorsal view; sides steeply declined to lateral margins in
anterior parts,gently so in lateral margins, which are finely
bordered; disc moderately convex, closely andrather umbilicately
punctate, each puncture with a subdecumbent1ong hair. Scutellum
subtrian-gular, feebly convex, rather asperate, covered with fine
hairs.
Elytra about 16 times as long as wide,3.8 times the length and
13 times the width ofpronotum, widest at basal 3/8; dorsum rather
strongly convex, highest at basal t/4, very weaklyflattened in
intero-basa1 part; disc punctate-striate, the striae in
antero-interior parts often dis-continuous, the punctures in striae
small and closely set; intervals feebly convex, weakly cov-ered
with isodiametric microsculpture, scattered with small, feebly
transverse punctures, eachwith a minute protrusion at the anterior
edge and a decumbent long hair; humeri weaklyswollen; apical parts
rounded.
Terminal segment of maxillary palpi widened apicad, truncate at
apex, with rounded inte-rior side. Prosternum coarsely, closely
punctate and wrinkled; mesosternum coarsely punctate;metasternum
weakly covered with isodiametric microsculpture, scattered with
punctures, eachwith a bent short hair. Abdomen closely, finely
punctate, each with a decumbent hair, lateralparts of 3rd sternite,
major parts of 4th and whole part of 5th weakly covered with
isodiametricmicrosculpture;5th(anal) stemite without special
modification.
Legs moderate-sized and ordinary in shape in the members of this
genus; 3rd and4th seg-ments of pro- and mesotarsi rather noticeably
dilated towards each apex, 3rd the widest;metatarsi with3rd segment
feebly widened; ratios of lengths of pro-, meso- and metatarsal
seg-m e n ts: 0.30, 0.15, 0.18, 0.25 , 0.49; 0.60, 0.23, 0.24,
0.48; 1 .00, 0 .33,0.28, 0 . 50.
Male genitalia about 13 mm in length and 0.3 mm in width; basal
piece bold in majorbasal part, rather strongly nalTowed anteriad;
fused parameres somewhat subrhombic, gentlybent ventrad at the
border of basal piece,0.26 mm in length, somewhat nib-shaped.
Body length: 7.2-8.6 mm.Type series. Holotype. , Amami-oshima
Is., Uken-son, Chuo-rindo,150-300m,22_24.
VII i999, K. AKITA leg. Paratypes. Amami-oshima Is:1 ,3 早早, same
data as the holotype;1 , Uken-son, Mt.Yuwan-dake, 2. VII i994, 1.
HIRA11eg; 1 早, Kinsakubaru, 26_27. VI.2001, 1. HIRAI leg;1 (i'、,
Uragami,22. V. 1960, K. YAMADAleg;1 , Naze, 12. VI. 1960,
K.YAMADAleg; Takara-jima Is:2早,6. VI.1981, J.0KUMAleg.
Distribution. Amami-oshima Is., Takara-jima Is.This specific
name is dedicated to the late Mr. Isamu HIRAl, who supported our
present
study and is one of the collectors of the type materials.
Borboresthes kimurai sp nov.[Japanese name:
Tarama-tobiiro-kuchikimushi]
(Figs 4,10, 16, 22)
Body e1ongate-subelyptica1, moderately convex dorsad; dark
reddish brown, apjca1 part ofhead, mouth Parts, antennae, femora
and tibiae dark yellowish brown, tarsi dusky yellow, hajrs
-
Borbo,-est/1es from the Ryukyu Islands
12
Fjgs 7_l2. Head and pronotum ( ). - 7, B kabi1-ensls MAEDA et
NAKANE. 8, B amamianuS MAEDA et
NAKANE;9, B. hi1・ail sp nov., hOlOtype;10, B. ki1川l''al sp nov.,
hOlOtype; 11, B. 011n10mOi SP・ nov・, hOlO-type;12, B nakanel sp
nov., holotype. Scale=1 mm.
113
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l l 4 Katsu mi AKITA and K imio M AsUMoTo
on head, pronotum and scutellum dusky yellow, those on major
part of elytra a feebly brownishyellow, and those on antennae and
legs dark yellowish brown to pale brown under a certainlight; head,
pronotum and scutellum dully shining, elytra weakly, somewhat
sericeously shining,ventral side of neck vitreously shining,
prosterunum hardly shining, metasternum and abdomenweaky, somewhat
vitreously shining, abdomen gently, somewhat sericeously shining;
dorsalsurface rather densely clothed with recumbent long hairs,
ventral surface rather densely clothedwith shor t recumbent
hairs.
Head subtrapezoidal and rather at, weakly covered with
isodiametric microsculpture,closely punctate, clothed with fine,
not so long hairs, the punctures often con?uent with oneanother in
anterior part; clypeus subquadrate, roundly defined from frons,
feebly depressedagainst frons, gently produced and
subpara11e1-sided, weakly inclined anteriad, and truncate infront;
genae rather small, subtriangular, hardly produced laterad, weakly
depressed in posteriorparts before eyes, weakly punctulate; frons
feebly convex, weakly declined to fronto-clypea1border, which is
evenly curved and reached to lateral margins; areas along interior
parts of eyesweakly rugoso-punctulate. Eyes transversely
subreniform in dorsal view, gently convex exteri-ad, with interior
parts comparatively narrowly inlaid into head and bordered from
head bygrooves. Antennae filiform, reaching basal t/3of elytra,
ratio of the length of each segmentfrom base to apex: 0.32, 0.12,
0.48, 0.52, 0.46,0.45,0.44, 0.49,0.40,0.40,0.43.
Pronotum subtrapezoida1 in dorsal view, very closely, feebly
umbilicately punctate, cov-ered with decumbent fine hairs, which
become longer in lateral parts; apex roundly producedanteriad,
finely rimmed in major lateral parts; base wholly bordered by a
fine deep groove,weakly produced in medial part, feebly truncate in
front of scutellum, rather angularly sinuouson each side; front
angles rounded but not seen from above, hind angles rectangular in
dorsalview with corners rounded; sides steeply declined to lateral
margins in anterior parts, gently soin lateral margins in posterior
parts, both of which are wholly finely rimmed; disc
moderatelyconvex, covered with isodiametric microsculpture, very
closely and weakly umbilicate-punc_fate, each puncture with a
rather recumbent long hair. Scutellum subhexagona1, convex,
weaklycovered with isodiametric microsculpture,
rugu1oso-punctulate, and clothed with fine decum_bent hairs.
Elytra about l6 times as long as wide,3.5 times the length and
slightly less thant 3 timesthe width of pronotum, widest at basal
t/4; dorsum rather strongly convex, highest at basal t/4,very
weakly flattened in interior-basal part; disc with rows of
punctures, which are closely setand mostly connected by shallow
grooves, each puncture with fine decumbent hajr; jntervalsfeebly
Convex, very weakly covered with isodiametric microsculpture,
rather jrregularly seat_te「ed with small, feebly transverse
punctures, which are often connected wjth one another andfo「min9
t「ansverse wrinkles, each puncture with a minute protrusion al the
anterior edge and arecumbent long hair; humeri weakly swollen;
apical pari rounded.
To「minal So9ment of maxillary palpi subsecuriform, with inferior
side shortest and gentlyCu「Vcd, eXte「iO「 Side gently curved, about
16 times longer than the jnlerjor jnlength, apex near_1y St「al9ht,
1.8 times longer than the interior. Prosternum rugu1oso_punctate;
mesosternumCOa「Sely Punc tate, metasternum weakly covered wi th
isodiametric mjcrosculpture, scatteredWith PunCtu「eS, each with a
short recumbent hair; abdomen closely, finely punctate, each with
a「eCumbent She「t hair. Abdomen rather closely punctate, each with a
recumbent short hajr, lateralPa「tS of 2nd Ste「nife, major parts of
3rd and whole part of 4th and5th weakly covered wjth 1so_diamet「IC
miC「oSCulPture, lateral parts of 1st and2nd and4th sternites and
basal and lateral parts
-
Bo,-bo,-est/1es from the Ryukyu Islands
13
17 18
115
Figs. 13 - 18. A n tenna ( f ). - 13,B. kabi''ensts MAEDA et
NAKANE;14, B a'na'n ianus M AEDA etNAKANE; 15, a li i''all sp n
ov.,holotype;16, B. kimll1-at sp nov.,holotype; l 7, B o/111tomo1
sp.nov., holotype; l8, B. nakanei sp.nov., holotype. Scale=1
mm.
of 3rd longitudinally wrinkled, male5th stemite feebly attened
in middle.Legs moderate-sized and ordinary in shape; 3rd and4th
segments of pro- and mesotarsi
noticeably dilated towards each apex, 3rd the widest; metatarsi
with 3rd segment gentlywidened; ratios of lengths of pro-, meso-
and metatarsal segments:0.25,0.18,0.21,0.28,0.43;0.48,
0.25,0.23,0.28, 0.40; 0.83,0.33, 0.28,0.45.
Male genitalia elongated fusiform in dorsal view, about 15 mm in
length and 0.25 mm inwidth; basal piece gently narrowed anteriad;
fused parameres somewhat nib-shaped, directedanterior-ventrad,0.25
mm in length.
Bodylength:7.0-7.6 m m .Type series: Holotype. , Tarama-j ima
Is.,3. VI. l996, M. KIMURA leg. Pa「atyPeS 3早
早, same data as the holotype.Distribution. Tarama-j imaIs.Thjs
specjfic name is dedicated to Mr. M. KIMuRA, who provided us with a
So「ieS of the
type materials.
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116 Katsumi AKITA and Kimio MAsUMoTo
Borboresthes ohmomoi sp n o v .[Japanese name:
0hmomo-tobiiro-kuchikimushi]
(Figs 5, 11, 17, 23)
Body e1ongate-elyptica1, rather strongly convex dorsad; head
excluding apical part, prono-toum and scutellum dark reddish brown
with feeble coppery tinge, elytra, metastenum andabdomen mostly
dark brown, anterior part of head, basal parts of antennae, meso-
and metaster-na, femora and legs mostly reddish brown, apical parts
of antennae, mouth parts and tarsi yel-lowish brown, hairs on
dorsal surface dusky yellow with feeble brownish tinge; head and
prono-tum gently shining, scutellum and elytra weakly, rather
sericeously shining, ventral side of neckstrongly and vitreously
shining, prosternum hardly shining, mesosternum and metasternum
gen-tly, somewhat vitreously shining, abdomen weakly and rather
sericeously shining; dorsal sur-face rather densely clothed with
recumbent long hairs; ventral surface clothed with recumbentshort
hairs.
Head subtrapezoida1, closely punctate and clothed with fine
hairs; clypeus subquadrate,weakly inclined anteriad, feebly
narrowed anteriad and truncate in front, fronto-clypea1
bordercurved and shallowly grooved; genae rather small,
subtriangular, feebly produced anterior-later-ad, weakly raised in
middle, gently declined to eyes; frons feebly convex, weakly
inclined ante-riad and to eyes, the punctures often con?uent with
one another in anterior parts. Eyes trans-versely subreniform in
dorsal view, gently convex exteriad, with interior parts
comparativelynarrowly and roundly inlaid into head. Antennae fili
form, reaching basal t/3 of elytra, ratio ofthe length of each
segment from base to
apex:0.34,0.13,0.48,0.64,0.54,0.50,0.48,0.54,0.45,0.45 , 0.44.
Pronotum subtrapezoida1 in dorsal view; apex roundly pl・educed
anteriad, almost whollyand finely rimmed; base wholly finely
bordered, weakly produced in medial part, feebly truncatein front
of scutellum, rather noticeably sinuous on each side; front angles
rounded, scarcely seenfrom above, hind angles subrectangular with
rounded corner in dorsal view; sides gentlydeclined to lateral
margins, which are finely bordered and visible in whole areas from
above;disc moderately convex, closely and feebly umbilicately
punctate, each puncture with a recum-bent long hairs, these in
lateral parts becoming bolder than those in central part. Scutellum
trian-gular with feebly rounded sides, very weakly convex in medial
part, shallowly punctulate,sparsely covered with fine long
hairs.
Elytra about 17 times as long as wide, 3.4 times the length and
13 times the width ofpronotum, widest at basal2/7; dorsum rather
strongly convex, highest at basal2/7; disc puncta_to-striate, the
punctures in striae small and closely set; intervals weakly convex,
very feeblyCove「ed with isodiametric microsculpture, scattered with
small, somewhat transverse punctures,each With a minute Protrusion
at the anterior edge and a recumbent long hair; humeri
weaklyswollen; apical part gently rounded.
Te「mina1 Segment of maxillary palpi widened subsecuriform, with
interjor sjde shortestand Weakly 「ounded, exterior side nearly
straight and about 1 .5 times jn length of jnterjor, andapex
Sli9htly curved and 17 times of the same. Ventral side of neck
noticeably convex, pol_iShed. P「oSte「num wrinkled; mesosternum
coarsely rugu1oso-punctate; metasternum weaklyCove「ed With
iSOdiametricmicrosculpture, scattered with punctures, each with a
recumbent shorthai「. Abdomen mostly, weakly covered with
isodiametric microsculpture and1ongjtudjna11yW「inkled, 「athe「
Closely, finely punctate, each with a recumbent fine hajr;5th
sternjte semjcjrcu_
-
Bo,・bo,・esthes from the Ryukyu Islands 117
Figs. l9-24. Male genitalia. - 19, B. k:abl,ensls MAEDA et
NAKANE 20, B a na,n1-atltls MAEDA et NAKANE; 21. B il l''all sp
nov., holotype;22, B. kim1l,-a1 sp nov.,holotype; 23, B. clime,noi
sp nov., holotype; 24, B. nakanel sp nov., holotype.Scale = 1
mm.
1arly emarginate at apex in male.Legs moderate-sized and
ordinary in shape in the members of this genus; 3rd and4th seg-
ments of pro- and mesotarsi rather noticeably dilated towards
each apex, 3rd the widest;metatarsi with3rd segment feebly widened;
ratios of lengths of pro-, meso- and metatarsal seg-ments: 0.40, 0
. 18, 0.19, 0.25, 0 .45; 0.60, 0.25, 0.23 , 0.28, 0.49; 1 . 10,
0.33, 0 . 27, 0.48.
Male genitalia slender, about 18 mm in length and 0.3 mm in
width, gently curved in lat-eral view; basal piece prolonged and
narrowed in anterior 1/3; fused parameres sublinguiform indorsal
view, 0.3 run in length.
Bodylength:7.9-9.3 m m .Type series: Holotype d''、,
Ishigaki-jima Is., Mt. Buzama-dake, l7. IV.1998, S. 0HMoMo
leg. Paratypes. Ishigaki-jima Is : 1 , same data as the
holotype;1 , Arakawa, 18. VI. 1995, C.END01eg;1 (j1、,1 ,
Yonehara,1-7. V. 1994, H. 0ToBEleg; Iriomote-j ima Is : l ,
Aira-gawaRiv.,23. m.1999, S. INADAleg;1 早, ditto,4. V 2003, H.
0TOBEleg;1 f, dittO,28. IV 2003,T. KURIHARA leg ; 1 , Nakama-gawa
Riv., 1. V. 1994, H. 0ToBEleg; 1早, Haemida,5. V.2003, H.
0TOBEleg.
Distribution. Ishigaki-jima Is., Iriomote-j ima Is.Thjs species
is named in honor of Dr. S. 0HMoMo, who collected the holotype of
the pre-
sent new species.
-
118 Katsumi AKITA and Kimio MAsUMoTo
Borboresthes nakanel sp n o v.
[Japanese name: Nakane-tobiiro-kuchikimushiJ(Figs 6,12, 18,
24)
Body elongated-elliptical, rather strongly convex dorsad; dark
reddish brown to dark yel-lowish brown, apical part of head, mouth
parts, antennae and legs brownish yellow, hairs ondorsal surface
dusky yellow with feeble brownish tinge; head, pronotum, antennae,
major ven-tral parts and legs genty shining, scutellum and elytra
feebly sericeously shining; dorsal surfacedensely clothed with
decumbent, rather long hairs; ventral surface sparsely clothed with
recum-bent short hairs.
Head subtrapezoida1 and gently convex in middle, very weakly
covered with isodiametricmicrosculpture, closely, somewhat
umbilicately punctate and clothed with fine hairs;
clypeussubquadrate, defined from frons by curved fronto-clypeal
border, with anterior part produced,feebly narrowed anteriad and
truncate in front; genae rather small, subtriangular, feebly
pro-duced laterad, very weakly raised in middle, depressed in
posterior parts before eyes, rugu1oso-punctulate in interior parts
and impunctate in marginal parts; frons feebly convex,
weaklyinclined anteriad; areas near eyes weakly depressed,
shallowly grooved along eyes. Eyes trans-versely subreniform in
dorsal view, gently convex exteriad, with interior parts narrowly
inlaidinto head. Antennae 1iform, reaching basal t/3of elytra,
ratio of the length of each segmentfrom base to apex: 0.24, 0.19,
0.46, 0.50, 0.40, 0.42, 0.42, 0.40, 0.40, 0.36, 0.42.
Pronotum subtrapezoida1 in dorsal view, very weakly covered with
isodiametricmicrosculpture, very closely, rather umbilicately
punctate, covered with recumbent, rather longhairs; apex roundly
produced anteriad, almost wholly, finely rimmed; base wholly
bordered andrimmed, weakly produced in medial part, feebly
emarginate in front of scutellum, rather notice-ably sinuous and
impressed on each side of the production; front angles rounded but
hardly seenfrom above, hind angles subrectangular in dorsal view;
sides steeply declined to lateral marginsin anterior parts, gently
so in lateral margins, which are finely bordered; disc moderately
con-vex, closely and somewhat umbilicate-punctate, each puncture
with a recumbent long hair; thehairs in interior-medial parts being
shorter and finer than those in anterior-lateral parts.Scutellum
sublinguiform, feebly convex, feebly asperate, closely covered with
fine hairs.
Elytra about 17 times as long as wide,3.5 times the length and
13 times the width ofpronotum, widest at basal t/3; dorsum rather
strongly convex, highest at basal3/8; disc puncta-te-striate, the
punctures in striae small, slightly ovate and closely set;
intervals feebly convex,weakly covered with isodiametric
microsculpture, rather closely scattered with small punctures,each
with a minute protrusion at the anterior edge and a recumbent long
hair, the hairs in interi_or-medial Parts bein9 shorter and finer
than those in anterior-lateral paris; humeri weaklyswollen; apical
parts rounded.
Terminal segment of maxillary palpi missing in the holotype.
Ventral side of neck pol_iShed. P「oSte「num rugu1oso-punctulate,
almost asperate; mesosternum rugu1oso_punctulate toW「inkled;
metasternum scattered with punctures, each with a fine short hair.
Abdomen closely,finely punctate, each with a fine short hair, basal
and lateral parts of 1st to3rd sternjtes1ongjtu_dina11y
wrinkled,5th male stemite weakly depressed in apical part, wjth
rounded at apex
Legs moderate-sized and ordinary in shape in the members of this
genus; pro_ and meso_ta「Si with3rd and4th segments rather
noticeably dilated towards each apex, respectively, pro_ta「Si
With3「d Segment largest, mesotarsi with4th segment largest,
metatarsi with3rd segment
-
4(3)5(6)
IS
Male genitalia with basal piece not nalTowed in anterior
1/3Elytra with sutural parts lighter in color; fused parameres
elongate, about20% the wholelength of genitalia. Body
length:7.0-7.5 mm. Amami-oshima Is., 0kinoerabu-j ima Is. - -
58
67
Bo'bo1-est/1es from the Ryukyu Islands l l 9
a o/momol sp nov
gently widened; ratios of lengths of pro-, meso- and metatarsal
segments: 0.2g, 0.18, 0.20, 0.24,0.40; 0.43, 0.19,0.20, 0.25, 0.45;
0.80, 0 . 28, 0.30, 0.38.
Male genitalia extremely elongated fusiform, about 16 mm in
length and 0.25 mm jnwidth, weakly curved in lateral view; basal
piece gradually narrowed towards the border ofParameres; fused
parameres elongated subtriangular in dorsal view, gently weakly
ventrad,0.24mm in length, subnib-shaped.
Body length: 6.2-7.4 mm.Type series. Ho1otype. 1 , Ishigaki-j
ima Is., Kabira, 13. V. 1973, T. NAKANE leg.
(NSMT-I-C42973). Paratypes. Ishigaki-jima Is: 1 早, same data as
the holotype(NsMT_I_c42971);2早早, ditto, 23. V 2001, T. SHIMADA
leg;1 , Mt. Buzama-dake, 17. IV. 1998, S.OhmOm01eg; 1 , Yonehara,
26. V 2001, T. SHIMADA leg ; 1 , dittO, 23. V 2003, J.OKAMURA leg ;
1 ,1 早, dittO,6-9. V 2004, H. 0ToBEleg ;1 (j1、, dittO,3. V 2005, H.
0ToBEleg;1 (11、, ditto,7. V.1993, K. AKITA leg; 1 早, Yoshihara,4-5.
V.1994, H. 0ToBEleg;Iriomote-j ima Is ;1 早, Haemida, 5. V 2003, H.
0ToBEleg; 1 早, Hoshinosuna Camp sjte,16- 17. V 2001, T. SHIMADA
leg.
Distribution. Ishigaki-j ima Is., Iriomote-j ima Is.The specific
name is dedicated to the late Dr. T. NAKANE, who studied the
A11eculinae of
the Ryukyu Islands, and collected the type materials of the
present new species.
Key to the Species of the Genus Borboresthes from the Ryukyu
Islands
1(2) Antennae slender, reaching beyond the middle of body length
in male, or about the half ofthe same in female. Male genitalia
with basal piece strongly curved in middle in lateralview;
parameres very long, about28% the whole length of genitalia. Body
length:8.2-9.5mm. Ishigaki-jima Is., lriomote-jima Is. - - - -
Bo1-boresthes kabi rensis MAEDA et NAKAE
2(1) Antennae not beyond the middle of body length even in male.
Male genitalia with basalpiece weakly curved in lateral view; fused
parameres less than20% the whole length ofmale genitalia
3(4) Male genitalia with basal piece prolonged and narrowed in
anterior l/3; fused parameressublinguiform in dorsal view. Body
length: 7.9-9.3 mm. Ishigaki-j ima Is., Iriomote-jima
Elytra wholly dark brown to dark grayish brown; fusedwhole
length of genitalia
B amamianus MAEDA et NAKANE
parameres short, less than t7% the7
pronotum and elytra dark grayish brown. Male genitalia with
basal piece bold in majorbasal part, rather strongly narrowed
anteriad; fused parameres somewhat nib-shaped,about 17% whole
length of genitalia. Body length: 7.2-8.6 mm. Amami-oshima
IS.,Takara-j ima Is a /1iralf sp nov
8(7) pronotum and elytra dark reddish brown to dark yellowish
brown. Male genitalia eton9at-ed fusjform, with basal pieces not
strongly narrowed anteriad; fused paramereS about 10-12% the whole
length of genitalia 9
-
120 K atsumi AKITA and Kimio MAsUMOT0
9(10)Male genitalia elongated fusiform, fused parameres long,
about 12% the whole length ofgenitalia, somewhat nib-shaped.
Bodylength: 7.0-7.6 mm. Tarama-j ima Is
要 約
秋田勝己・ 益本仁雄: 日本産ゴミムシダマシ科甲虫の新種・ 稀少種 (第7 報) ・ 琉球列島産 トビイロクチキムシ属 (
ゴミムシダマシ科クチキムシ亜科) の再検討. 一 琉球列島産トビイロクチキムシ属Borboresthesは, これまで西表島からB
fuliginosus FAIRMAIRE,1897 ミナミトビイロクチキムシ (ヵバイロクチキムシ) (MlwA, l933),
奄美大島からB amamianus MAEDA etNAKANE, 1988 アマミトビイロクチキムシ, 石垣島からB
kabirensis MAEDA et NAKANE, 1988イシガキトビイロクチキムシが知られている. このうち, .a
fuliginosusは中国・ 四川省のものであることから, 同定間違いであると考えられる.著者らは, 今回,
琉球列島産の本属の種を再検討し, MAEDE et NAKANE(1988) の2 種のほかに4 新種を見出したので, B
hirali sp nov. ヒライトビイロクチキムシ (奄美大島, 宝島), Bkimurai sp nov.
タラマトビイロクチキムシ(多良間島), B ohmomoi sp nov. オオモモトビイロクチキムシ(石垣島, 西表島), B
nakanei sp nov. ナカネトビイロクチキムシ (石垣島, 西表島) として命名記載し, これに全6種の検索表を付した.
また, 沖永良部島からB amam1-anusを, 西表島からB kablrensisを記録した.
References
10(9) Male genitalia extremely elongated fusiform, fused
parameres short, about 10% the wholelength of genitalia, elongated
subtriangular. Body length: 6.2-7.4 mm. Ishigaki-jima
Is.,Iriomote-j ima Is
a zmurai sp nov
B nakanei sp nov
AZUMA, S. (ed ), S. AZUMA, M. YAFUS0, M. KINJ0, M. HAYASH1, T.
KOHAMA, T. SASAKI, M. KIMURA. & F.KAwAMuRA, 2002. Check List of
the Insect of the Ryukyu Islands (Second Edition), the
BiologicalSociety of Okinawa, Nishihara,Okinawa, xxiv+570 pp. (In
Japanese, with English book title)
FAIRMAIRE, L., 1897. Coleopteres du Sze-tchouen et de
Koui-Tcheou (China). Notes from the LeydenMuseum,19: 241-255.
KIMOTo, T.,2004. Distribution Records of A11eculinae.
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NAKANE, l988. New or Little-known Coleoptera from Japan. Review of
Miyazaki
Sangyo-keieiUniverslty,1(1): 1-10.MIYATAKE, M., l985.
A11eculidae. In: KUROSAWA, Y et al. (eds), The Coleoptera of Japan
in Color, 3:
346-348 [incl. pl 59]. Hoikusha,Osaka. (In Japanese, with
English book lille)MIWA, Y.,1933. An enumeration of Coleoptera from
the island I1iomote in Loochoo, with descrjptjons of
new Species(The Coleopteran fauna of Loochoo, I). Transection of
theNaturalHistory society ofFormosa, 23: 4-11 .
SASAJl, H・,1989. A11eCulidae. In:: HIRASHIMA, Y., eta1. (eds). A
Check List of Japanese Insects[1]:418_419. Kyushu University. (In
Japanese with English book tjlle)
(Received October 10, 2008; Accepted October24,2008)