Trachys albopilosus Peng, 2021

Trachys albopilosus Peng , new species

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( Figs. 4 – 6 View Figs )

Type Specimen. Holotype ( BPCQ), female, labeled: “Qianqingtang, 30°09′N 118.51′E, Qingliangfeng National Nature Reserve, LinAn , Zhejiang, China, 16-V-2012, Leg. Huang Pang ”.

Description. Habitus ( Fig. 4 View Figs ): Length 3.8 mm, width 2.5 mm; head and pronotum dark bronze-purple, elytra black with purple reflections; underside dark brown with slightly purple reflections. Head: Widely excavated between eyes; vertex transversely convex, but slightly depressed in middle, sparsely and irregularly covered with pale and yellow pubescence; frons deeply depressed centrally with dense and recumbent brown-yellow pubescence; eyes reniform, genae very short; antennal sockets situated above lower margins of eyes; antennae short, barely reaching anterior margin of pronotum when laid alongside; antennal scape and pedicel submoniliform, about 1.20 times as long as wide; antennomeres 3 – 6 much shorter than scape and pedicel and slightly shorter than remaining apical ones, cylindrical, about 1.52 times as long as wide; antennomeres 7 – 11 serrate; clypeus wide, bronze, metallic and shiny; anterior margin deeply emarginate as a semi-circular notch, clypeal suture slightly arcuate, lateral sides narrowed at midlength. Pronotum: 3.13 times as wide as long, widest at base but narrower than elytra at base and much narrower than at elytral humeri; lateral margins sharply converging from base to acute anterior angles; anterior margin biarcuate with broad median lobe; basal margin trisinuate, median lobe arcuate; disc more or less convex, slightly depressed along lateral and basal margins; surface nearly uniformly covered with scale-like sculpture and small punctures, very sparsely and irregularly clothed with bright white pubescence. Scutellar shield: Very small but clearly visible, subtriangular. Elytra: 1.35 times as long as wide, 4.65 times as long as pronotum, widest at humeri; lateral margins slightly diverging from base to humeri, deeply emarginate from humeri to midlength, then sharply converging to sub-apices and arcuately to apices, apices separately arcuate with very small apical and lateral denticles; elytra more or less convex; humeri rather strongly projecting beyond elytral outline; basal depressions indistinct; entire elytra nearly uniformly covered with indistinct double-circled sculpture; ornamentation consisting of only bright white pubescence arranged on each elytron as follows: a spot at basal depression and another under humerus, a medially interrupted oblique stripe at midlength, a small spot behind midlength near suture, and two parallel and zigzag transverse bands on posterior half. Lateral view ( Fig. 5 View Figs ): Thickest point lying at basal third of elytra, maximal thickness slightly exceeding length of head plus pronotum; curvature with angle of about 125° between pronotal margin and subhumeral lobe; basal part of elytral margin obliquely straight with angulate angle above metaventrite; humeral carina rather weakly arcuate. Underside ( Fig. 6 View Figs ): Anterior part of prosternum very wide, butterfly-shaped; anterior margin arcuately anteriorly produced at middle, posterior margin oblique laterally; prosternal process long, about 2.2 times as long as wide, widest at apical angles; apical margin arcuate, lateral sides narrowed at middle, basal margin distinct; surface smooth with sparse, pale pubescence; hypomeral marking on each side very large, footprint-like, with very dense micro-wrinkles, near side with a strong carina; metaventrite centrally glabrous, covered with ocellate sculpture, nearly uniformly clothed with short, pale pubescence near sides and along anterior margin and covered with strong arcuate wrinkles; abdomen nearly uniformly covered with short, sparse, pale pubescence; anterior two abdominal ventrites with dense wrinkles and indistinct ocellate sculpture, remainder rather smooth; posterior margin of anal ventrite arcuate medially. Legs: Procoxa and mesocoxa globular, metacoxa distinctly expanded as a transverse plate and covered with ocellate sculpture; all trochanters small, nearly triangular; all femora moderately dilated; all tibiae slender with pale pubescence, row of brown-yellow soft spines along inner side of each tibia; all tarsi light brown-yellow; each claw with a swollen tooth at base. Sexual dimorphism: Male unknown.

Differential Diagnosis. This species is similar to Trachys sororculus Obenberger, 1929 , but differs from it as follows: 1) in T. sororculus , the humeri are moderately produced, the lateral margins are only slightly emarginate behind the humeri, and the entire lateral margin is subarcuate, while in T. albopilosus the humeri are strongly produced, the lateral margins are deeply emarginate behind the humeri, and the entire lateral margin is rather sharply attenuate posteriorly; 2) in T. sororculus the pronotum is covered with dense yellow mixed with pale pubescence, while T. albopilosus is mostly glabrous with only sparse bright white pubescence; and 3) the prosternal process in T. sororculus is dilated and fan-shaped apically, while in T. albopilosus the prosternal process is arcuate apically.

Etymology. The specific epithet is an adjective derived from two Latin adjectives, “albus” meaning white, and “pilosus” meaning hairy, referring to the bright white pubescent ornamentation on the elytra.