Cyllodes accentus Kirejtshuk, 1985

Liu, Meike, Yang, Xingke & Huang, Min, 2016, One new species and one newly recorded species of Cyllodes Erichson from China (Coleoptera: Nitidulidae: Nitidulinae), Zootaxa 4079 (3), pp. 345-356 : 350-353

Cyllodes accentus Kirejtshuk, 1985 , new record for China

( Figs. 9–16 )

Cyllodes accentus Kirejtshuk 1985: 162 .

Description. Length 6.6 mm, width 5.1 mm. Body yellowish-brown with three circular black spots on pronotum and three different sizes of black spots on each elytron. Dorsum glossy and shining, surface consisting of dense punctures with distinct microrecticulate interspaces between them ( Figs. 9, 10 ).

Head overall yellowish-brown. Surface with circular punctures, about 1.0–1.5× eye facet width in diameter, 1.5–2.0 puncture diameters apart. Eyes slightly prominent, finely faceted, interfacetal setae absent. Antennal grooves distinctly margined and slightly deepened, convergent posteriorly, the shortest distance between them about 2× width of mentum. Antenna with yellowish-brown funicle and 4-segmented club black. Club slightly longer than antennomeres 1–7 combined. Terminal antennomere about half length of other three combined club antennomeres. Scape 4.0× longer than pedicel. Pedicel small, 0.3× as long as antennomere 3 ( Fig. 11 ). Apical edge of mandibles with only two teeth; molar region with large transverse ridges; prostheca with slightly dense setal brush ( Fig. 12 ). Terminal segment of maxillary palpi elongate, nearly 1.5× longer than 1–2 combined segments; lacinia with short dense brown setal brush apically and long dense black setal brush along anterior half of lateral region ( Fig. 13 ). Terminal segment of labial palpi obviously longer than wide, with convex sides and slightly narrowed apically. Mentum nearly square and flattened at anterior margin, with faint minute punctures laterally and posteriorly, interspaces smooth.

Pronotum transverse (L:W = 1.0:2.8), widest near posterior angles; punctures similar to circular punctures on vertex, punctures on posterior half denser than on anterior half, interspaces smooth to finely microreticulate along lateral and posterior margin. Scutellar shield inverted-trapezoidal with posterior margin truncate. Prosternum with space between coxae and anterior margin about 2× width of procoxal process between coxae. Prosternal process slightly expanded posterior to procoxae. Mesoventrite with punctation slightly smaller than on pronotum, surface sculpturing granular with some faint microreticulation. Mesoventrite distinctly carinate, on slightly more dorsal plane than metaventrite and prosternum; not or only slightly obscured by prosternal process. Meso-metaventral junction distinctly procurved. Metaventrite transverse (W:L = 1.0:2.4); metaventral disc sculpturing granular with dense punctures, space between them about 1–1.5 puncture diameters. Elytral margins parallel in the anterior half, then curved in the posterior half. Elytra covering pygidium completely; some serially punctate striae distinct; sculpturing smooth to slightly granular; punctures similar to those of pronotum but slightly less dense.

Distance between mesocoxae widest, about 0.5× length of antennal club, 1.5× wider than distance between metacoxae, 2.5× wider than distance between procoxae. Each femur canaliculate for reception of tibiae; widest near middle. Profemur 2.5×, mesofemur and metafemur about 2× width of corresponding tibia. Tibia slender and flat (W:L = 1.0:3.5). Protibia slightly narrower than width of antennal club, with distinct stout spines along outer edge and two unequal apical spurs. Mesotibia with row of short blunt spines along apical margin; with two obvious apical spurs; stiff seta-like spines along lateral, apical and distal half of inner margin. Metatibia similar to mesotibia, without distinct stout spines along outer edge, as wide as antennal club. Tarsi slightly narrower than corresponding tibiae. Claws simple.

Tegmen of male genitalia elongate (L:W = 2.8:1.0) with apex narrowly rounded and with dense and long setae around apical margin ( Fig. 14 ). Median lobe with apex slightly convex, near middle of lobe with pair of claw-like projections ( Fig. 15 ). Internal sac sclerites with paired ejaculatory rods, proximal to and around the ejaculatory rods with large fields of callosities, each end of ejaculatory rod divergent ( Fig. 16 ).

Notes. Cyllodes accentus had been reported from Vietnam. Here, we first report it from Yunnan in China. It differs from other members of this genus by possessing the following characters: 1) body with three circular black spots on pronotum and three different sizes of black spots on each elytron; 2) antennal club comprised of 4 antennomeres while other Cyllodes with only a 3-segmented club; 3) apical edge of mandibles with only two teeth; 4) maxillary lacinia with dense black setal brush along anterior half of the lateral region while other species of Cyllodes with brown setal brush; 5) scutellar shield inverted-trapezoidal with posterior margin truncate; 6) mentum nearly square; 7) mesoventrite distinctly carinate, on slightly more dorsal plane than metaventrite and prosternum; 8) male genitalia with median lobe with pair of claw-like projections near middle part.

Material examined. 1♂, China: Yunnan, Xishuangbanna, Mengzhe , 870m a.s.l., 08-VI-1958, Fuji PU ( IZAS) ; 1♂, China: Yunnan, Xishuangbanna, Mengzhe , 875m a.s.l., 01-VII-1958, Fuji PU ( IZAS) . Distribution. China (Yunnan), Vietnam.

Figures

FIGURES 9 – 10. Cyllodes accentus Kirejtshuk: 9. Male habitus, dorsal view; 10. Male habitus, ventral view. Scale bar = 1.00 mm.

FIGURES 11 – 13. Cyllodes accentus Kirejtshuk: 11. Right antenna; 12. Right mandible; 13. Right maxilla. Scale bar = 0.20 mm.

FIGURES 14 – 16. Cyllodes accentus Kirejtshuk: 14. Male tegmen; 15. Male median lobe of aedeagus; 16. Male internal sac sclerites. Scale bar = 0.20 mm.