Sinodorcadion chinense Xie & Wang, 2020

Zhao, Shuai, Xie, Guanglin & Wang, Wenkai, 2020, Two new species of the genus Sinodorcadion Gressitt, 1939 (Coleoptera: Cerambycidae: Lamiinae), Zootaxa 4768 (2), pp. 291-296 : 292

Sinodorcadion chinense Xie & Wang sp. nov. (ƤṃṃḎK+)

( Figs 1–4 , 9–12 )

Description. Male: Length 8.5–9.0 mm, humeral width 2.0– 2.1 mm, maximum elytral width 2.7–2.9 mm. Body mostly reddish-brown to dark brown, with golden-yellow pubescence; head, pronotum and elytra densely punctate. Lower margin and apex of mandible black, base of apical segment of maxillary palpi and base of apical two segments of labial palpi dark brown; antennae mostly light orange-brown, inner side of antennal tubercles and apex of each antennomere dark brown; both side of middle of femora, apical margin of tibiae and apical margin of each tarsomere dark brown. Elytra mostly dark brown, suture black, border of suture and apical fourth lighter in color, apical area mixed with golden-yellow pubescence and pale-brown integument, forming a large patch reddish brown to yellowish brown, the rest slightly gold mottled.

Head densely punctate; frons transverse, slightly convex, with a smooth black longitudinal median sulcus extending to occiput; last segment of maxillary and labial palpi with apex slightly flattened and truncated ( Fig. 9 ); eyes coarsely faceted, lower lobe narrow. Antennae about 2 times as long as body; antennal tubercles broadly separated; scape cylindrical, slightly thickened apically and sparsely punctate ventrally; antennomere III longer than IV, about 2 times as long as scape; antennomeres IV-X gradually shorter in length, antennomere XI subequal to VI. Pronotum slightly wider than long, similarly punctate as on head; anterior margin slightly wider than posterior margin; disc convex, with anterior and posterior distinct transverse sulcus; lateral tubercle conspicuous, slightly directed upward. Scutellum short, lingulate. Elytra elongate, about 2.1 times as long as maximum elytral width; widest at middle, then gradually narrowed towards apex, apex rounded; elytral surface more sparsely and coarsely punctate than on head and pronotum, punctures diminishing towards apex. Prosternum, mesanepisternum, mesoventrite and metaventrite coarsely punctate. First abdominal sternite with several coarse punctures laterally, apex of terminal abdominal sternite emarginate. Legs relatively long, tibiae approximately as long as femora, claws widely divergent.

Female: Length 10.5 mm, humeral width 2.9 mm, maximum elytral width 4.0 mm. Similar to male, but body relatively broad, body color more darker, mostly black brown, apex of each antennomere distinctly black brown, golden pubescence on elytra more dense and conspicuous, presenting obvious mottled maculae. Antennae about 1.4 times as long as body. Maxillary and labial palpi with apical palpomere fusiform ( Fig. 10 ). Pronotum slightly transverse. Elytra nearly ovate, length about 1.7 times as long as maximum width, strongly narrowing toward apices, surface distinctly and irregularly depressed. Apical edge of terminal abdominal sternite nearly straight.

Material examined. Holotype (male), China: Hubei, Wufeng county, Houhe National Nature Reserve , N 30°5′6″, E 110°32′38″, alt. 1410 m, June 3, 2019, coll. by Shuai Zhao . Paratypes: one male, same data as the ho- lotype but coll. by Yifang Ren; one female, Houhe National Nature Reserve, N 30°5′2″, E 110°40′47″, alt. 430 m, May 8, 2019, coll. by Shuai Zhao.

Distribution. China: Hubei.

Etymology. The specific name refers to the country where the new species is found.

Comments. The new species is easily distinguished from other known members of this genus by the body with golden pubescence, male maxillary and labial palpi with apical palpomere not expanded apically ( Fig. 9 ), apex of male elytra mostly reddish brown to yellowish brown, female elytra strongly constricted toward apices and surface with irregular shallow depressions. Furthermore, the antennae of the new species are rather long, male antennae are about 2 times as long as the body, female antennae are about 1.4 times as long as the body (in other known species, the male antennae are not more than 1.5 times as long as the body, the female antennae are at most slightly longer than the body length); male elytra also are very elongate, the ratio of elytral length to maximum elytral width is 2.1 (the ratio of others known species is not more than 1.9). The new species has the scape with coarse and sparse punctures, which is similar to Sinodorcadion punctuscapum Xie, Shi & Wang, 2013 .

The new species resembles some species of Dolophrades Bates, 1884 by the relatively long antennae ( Figs 1-4 ) and by the males with maxillary and labial palpi with no enlarged apical palpomeres ( Fig. 9 ). However, it can be differentiated from the species of that genus by the humeri not prominent and the humeral width distinctly narrower than the maximum elytral width.

Figures

FIGURES 1–8. Habitus of Sinodorcadion spp. 1–4. S. chinense Xie & Wang sp. nov. 5–8. S. zenghuaae Xie & Wang sp. nov. 1, 2, 5, 6. Holotype, male. 3, 4, 7, 8. Paratype, female.

FIGURES 9–16. Sinodorcadion spp. 9–12. S. chinense Xie & Wang sp. nov. 13–16. S. zenghuaae Xie & Wang sp. nov. 9–10. Labial palpus. 11, 15. Scape showing the sparse punctures. 12, 16. Mesoventrite. 13–14. Head in ventral view showing the maxillary and labial palpi. 9, 11–13, 15–16. Holotype, male. 10, 14. Paratype, female.