Strongylium liangi, Yuan, Cai-Xia & Ren, Guo-Dong, 2014

Yuan, Cai-Xia & Ren, Guo-Dong, 2014, Note on brachypterous Stenochiini from China (Coleoptera, Tenebrionidae) with description of a new species, ZooKeys 415, pp. 329-336 : 330-332

Strongylium liangi sp. n. Figs 2-10

Type specimen.

Holotype male: China, Yunnan, Lushui county, Pianma town, Yakou, 19.v.2005, Hong-Bin Liang leg. (IZCAS).

Diagnosis.

The new species is similar to Strongylium tanakai Ando, 2003, from Japan because their humeri are more developed than other brachypterous species of Strongylium , such as Strongylium claudum (Fig. 11) and Strongylium wuyishanense , but can be distinguished from the latter by its stouter body, the distance between the eyes being narrower than the transverse diameter of an eye, and the shape of the aedeagus, that is obliquely narrowed apically in dorsal view, slightly curved in lateral view.

Etymology.

Named in honor of Dr. Hong-Bin Liang, collector of the holotype.

Description.

Male (Figs 2-10). Body length 14.4 mm, elongate, slightly wider posteriorly. Colour dark brownish black, pronotum reddish, antennae and legs dark reddish brown, tarsi slightly lighter; head, antennae and pronotum almost dull, elytra shining; body surface almost glabrous except antennae, tarsi and ventral surface. Head (Fig. 2) subhexagonal, densely punctate; clypeus transverse, slightly and gradually declined forward in basal part, strongly bent ventrad in apical part, truncate at anterior edge; frontoclypeal suture deeply depressed; genae obliquely raised, with outer margins obtusely produced; frons somewhat widely T-shaped, steeply inclined anteriorly, slightly, longitudinally impressed in middle, surface irregularly and finely punctate, punctures often fused with one another, distance between eyes 0.66 times as wide as transverse diameter of an eye in dorsal view. Eyes medium-sized, rather protruding. Antennae (Fig. 4) subfiliform, reaching basal 1/5 of elytra, ratio of the length of antennomeres II–XI as 0.31: 1.02: 0.76: 0.58: 0.63: 0.65: 0.56: 0.53: 0.54: 0.67. Maxillary palpomere IV (Fig. 5) moderately expanded. Pronotum (Fig. 3) 1.06 times as wide as long, widest before the middle; anterior margin bordered, border tapering laterad; posterior margin bisinuate, bordered; both sides steeply inclined downwards, lateral margins arcuate anteriorly, obliquely narrowed at posterior one-third, bordered along entire length; anterior angles rounded, posterior angles subrectangular; disc moderately convex, shallowly impressed near anterior margin, densely covered with confluent, ocellate punctures. Scutellum triangular, densely and rugosely punctate. Elytra elongate ovoid, slightly dilated posteriorly, 2.11 times as long as wide, widest at apical one-third, 3.68 times as long as and 1.62 times as wide as pronotum; disc slightly convex, striae fine, strial punctures circular and fine anteriorly, be coming finer and nearly disappearing apically; intervals slightly convex, flattened apically, sparsely covered with microscopic granules at posterior 1/4; humeri moderately swollen, hind wings reduced, reaching basal 3/4 of elytra. Prosternum narrow, strongly raised between coxal cavities, impressed in middle, prosternal process strongly declined to roundly produced and protruding at apex. Abdominal ventrites (Fig. 7) covered with microscopic punctures and setae, ventrite V with dense punctures and setae, setae longer than those on I–IV. Legs slender, simple, length ratio of metatarsomeres I–IV as 2.01: 1.03: 0.68: 1.44. Aedeagus 2.48 mm long, 0.5 mm wide (Figs 8-9).

Female: unknown.