Cyllodes bifascies ( Walker, 1859 )

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 : 347-350

Cyllodes bifascies ( Walker, 1859)

( Figs. 1–8 )

Tritoma bifascies Walker 1859: 259 .

Chilocorus opponens Walker 1859: 219 . Camptodes ornatus Motschulsky 1863: 442 . Strongylus notatus Reitter 1873: 129 .

Strongylus binotatus Reitter 1879: 217 . Strongylus dorsalis Reitter 1884: 268 .

Cyllodes bifascies: Kirejtshuk 1992: 199 .

Description. Length 3.2 mm, width 2.4 mm. Body black with reddish-orange spots on lateral posterior region of pronotum and elytra. Surface sculptured on dorsum consisting of minute punctures with microrecticulate interspaces between punctures. Dorsum without setae, entire surface glossy and shining, only pygidium finely pubescent ( Figs. 1, 2 ).

Head with anterior half black and posterior half reddish-orange. Surface punctures irregular, circular or crescent shaped, about 1.5× eye facet width in diameter, approximately 1.5–2.0 puncture diameters apart. Eyes prominent, finely faceted, interfacetal setae absent. Antennal grooves distinctly margined and slightly convergent posteriorly, the smallest distance between them about 1.5× width of mentum. Antenna with funicle yellow and 3- segmented club black, apex of terminal segment yellow. Club about 0.7× length of 1–8 combined segments. Terminal antennomere shorter than other two combined segments. Scape about 2.0 times longer than pedicel. Pedicel small, barrel-shaped, about 0.6× as long as segment 3 ( Fig. 3 ). Apical edge of mandibles with five teeth; molar region with large transverse ridges; prostheca with dense setal brush ( Fig. 4 ). Terminal segment of maxillary palpi elongate, slightly expanded along middle region, longer than 1–2 combined segments; lacinia with long dense brown setal brush apically and anterior half of lateral region ( Fig. 5 ). Terminal segment of labial palpi slightly longer than wide, slightly narrowed apically, nearly conical. Mentum subpentagonal and angulate at medial anterior margin, with minute punctures, interspaces between the punctures smooth.

Pronotum somewhat transverse (L:W = 1.0:2.6), widest near posterior angles; punctures similar to punctures on vertex, punctures on anterior and lateral margin denser than other parts, interspaces smooth; sometimes with a few granules along lateral and posterior margin. Scutellar shield semicircular. Prosternum with space between coxae and anterior margin about 1.5× width of procoxal process between coxae. Prosternal process with weak longitudinal carina, expanded posterior to procoxae. Mesoventrite with punctation similar to pronotum, surface granular with some faint microreticulation. Mesoventrite carinate and on more dorsal plane than metaventrite and prosternum. Meso-metaventral junction broadly procurved. Metaventrite transverse (W:L = 1.0:3.0); metaventral disc sculpturing granular with punctures separated by 1.5–2.0 puncture diameters. Elytra slightly sloping, covering pygidium almost completely with only apex exposed; serially punctate striae visible; sculpturing smooth; punctures similar to those of pronotum.

Distance between mesocoxae widest, about 0.8× length of antennal club, 2.0× wider than distance between metacoxae, 4.0× wider than distance between procoxae. All femora canaliculate for reception of tibiae; widest near middle. Profemur 1.5×, mesofemur about 2×, and metafemur 2.5× as wide as corresponding tibiae. Tibia wide and flat (W:L = 1.0:2.0). Protibia slightly narrower than width of antennal club, with distinct stout spines along outer edge and two apical spurs. Mesotibia with two obvious apical spurs; row of short blunt spines along apical margin; 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. Protarsus about 0.75× width of protibia; mesotarsus and metatarsus slightly narrower than corresponding tibia. Claws simple.

Tegmen of male genitalia acuminate at apex with shorter setae medio-apically and longer setae laterally. Tegmen slightly elongate (L:W = 2.1:1.0) ( Fig. 6 ). Median lobe with apex slightly protuberant and with paired, widely separated elongate fingerlike projections antero-laterally ( Fig. 7 ). Female genitalia weakly sclerotized, slightly elongate (L:W = 2.3:1.0) ( Fig. 8 ).

Notes. Cyllodes bifascies had been inadequately described formerly. Kirejtshuk (1992) moved it from the genus Tritoma to Cyllodes with simple description. Here we redescribe it in detail and provide photos of habitus, antenna, mouthparts, and genitalia. Cyllodes bifascies differs from other members of the genus by possessing the following characters: 1) body with spots on lateral posterior region of pronotum and elytra; 2) apical edge of mandibles with five teeth; 3) prosternal process expanded posteriorly with weak longitudinal carina; 4) mesoventrite carinate, deeply concave for reception of the prosternal process (not be observed easily); 5) apex of male tegmen acuminate, setae not evenly distributed along apical region, shorter medially and longer laterally; 6) male median lobe with two elongate lateral fingerlike projections in apical half, widely separated.

Material examined. 1♂, China: Yunnan, Xishuangbanna, Damenglong, 650m a.s.l., 10-IV-1958, Shuyong WANG ( IZAS); 8♂, 7♀, China: Guangxi, Nanning, 17-I-2015, Ziling LI ( NWAFU).

Distribution. China (Guangxi, Yunnan, Taiwan), Russian Far East, Japan, Korea, SE Asia.

Figures

FIGURES 1 – 2. Cyllodes bifascies (Walker): 1. Male habitus, dorsal view; 2. Male habitus, ventral view. Scale bar = 0.50 mm.

FIGURES 3 – 5. Cyllodes bifascies (Walker): 3. Right antenna; 4. Right mandible; 5. Right maxilla. Scale bar = 0.20 mm.

FIGURES 6 – 8. Cyllodes bifascies (Walker): 6. Male tegmen; 7. Male median lobe of aedeagus; 8. Female ovipositor. Scale bar = 0.10 mm.