Trachys lingdongshanensis Peng, 2021

Peng, Zhongliang, 2021, Studies on the Genus Trachys Fabricius from China (2) - Descriptions of Six New Species (Coleoptera: Buprestidae: Agrilinae: Tracheini), The Coleopterists Bulletin 75 (4), pp. 749-757 : 749-751

Trachys lingdongshanensis Peng , new species

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( Figs. 1 – 3 )

Type Specimen. Holotype ( BPCQ), female, labeled: “Lingdongshan, altitude 500 m, 25°05′N 116.3′E, Lingtong Vil. Chengxiang , Wuping, Fujian, China, 10-V-2021, Leg. Z-L. Peng et Y-Q. Cai ” .

Description. Habitus ( Fig. 1 ): Length 3.0 mm, width 1.9 mm; form robust and attenuate; head and pronotum dark brown-purple, elytra black-purple; underside dark brown with purple reflections. Head: Widely depressed between eyes; vertex slightly transversely convex, sparsely covered with pale and yellow pubescence; frons nearly glabrous, with a fine longitudinal groove; eyes reniform, genae very short; antennal sockets situated above lower margin of eyes, deep and wide; clypeus nearly rectangular,anterior margin deeply and semi-circularly emarginate, clypeal suture slightly arcuate, lateral sides slightly narrowed at midlength; antennae very short, barely reaching margin of pronotum when laid alongside; antennal scape and pedicel submoniliform, about 1.20 times as long as wide; antennomeres 3 – 6 cylindrical, about 1.50 times as long as wide, much shorter than scape and pedicel and slightly shorter than remaining apical ones; antennomeres 7 – 10 serrate. Pronotum: 3.36 times as wide as long, widest at base, nearly as wide as elytra at base but much narrower than at elytral humeri; lateral margins from base directly converging to acute anterior angles; anterior margin biarcuate with median lobe slightly anteriorly produced; basal margin trisinuate with rather angulate median lobe; disc convex medially, slightly depressed along basal margins; surface nearly uniformly covered with coarse scale-like sculpture, irregularly clothed with semi-recumbent or recumbent, bright white pubescence but with irregular glabrous area. Scutellar shield: Indistinct or invisible. Elytra: About 1.46 times as long as wide, about 4.28 times as long as pronotum, widest behind elytral base; lateral margins slightly emarginate behind humeri, directly and sharply converging from apical third to apices; apices jointly arcuate without distinct apical and lateral denticles; elytral surface convex; humeri distinctly projecting beyond elytral outline; humeral depressions wide; entire surface irregularly covered with rugosities and foveae, clothed with black pubescence and bright white pubescent markings, arranged on each elytron as follows: sparse pubescence at basal depression, an indistinct circled spot at midlength near suture, two short, oblique stripes near side, two parallel and transverse zigzag bands on posterior half, and irregular pubescence near apex. Lateral view ( Fig. 2 ): Thickest point lying behind scutellar shield; maximal thickness greatly exceeding length of head plus pronotum; curvature with angle of about 140° between pronotal margin and subhumeral lobe; basal part of elytral margin slightly biarcuate with obtuse angle above metaventrite; humeral carina rather weakly arcuate. Underside ( Fig. 3 ): Nearly uniformly clothed with short, recumbent, pale pubescence; anterior part of prosternum transverse; anterior margin arcuate, slightly anteriorly produced at middle; surface with a transverse pubescent band; prosternal process about 1.15 times as long as wide, widest at apical angles; apical angles very acute; apical margin arcuate; lateral margins gradually diverging from base to apical angles; surface smooth, irregularly covered with pale pubescence; hypomeron smooth, depressed marking contracted, very small, nearly reniform; metaventrite sparsely covered with ocellate sculpture centrally but with strong transverse wrinkles near sides and along anterior margin, anterior margin arcuately and deeply emarginate; first two abdominal ventrites uniformly covered with ocellate sculpture, remainder rather smooth; posterior margin of anal ventrite acuminate medially. Legs: Procoxa and mesocoxa small and globular, metacoxa expanded as a transverse plate and covered with round or ocellate sculpture; all trochanters relatively large, nearly triangular; all femora moderately dilated; all tibiae slender with pale pubescence but without distinct spines; all tarsi bright yellow; claws with an indistinct tooth at base. Sexual dimorphism: Male unknown.

Differential Diagnosis. This species is slightly similar to Trachys suichuanensis Peng, 2021 , but it is easy to differentiate by being wider, the elytra in anterior two-thirds more quadrate and only moderately attenuate posteriorly, while in T. suichuanensis the lateral margins of the elytra converge sharply from midlength to the apices and are rather attenuate posteriorly. In addition, the shape of the anterior part of the prosternum is different; in T. lingdongshanensis it is transverse and the posterior margin nearly straight, while in T. suichuanensis it is butterfly-like with the posterior margin rather oblique.

Etymology. The specific epithet is an adjective referring to the mountain where the holotype was collected.

Figures

Figs. 1–12. Holotypes of new species of Trachys. T. lingdongshanensis, new species, holotype, female: 1) Dorsal view; 2) Lateral view; 3) Ventral view. T. albopilosus, new species, holotype, female: 4) Dorsal view; 5) Lateral view; 6) Ventral view. T. latipennis, new species, holotype, male: 7) Dorsal view; 8) Lateral view; 9) Ventral view; 10) Aedeagus (dorsal view). T. aureolus, new species, holotype, male: 11) Dorsal view; 12) Ventral view.