Trachys jinpenshanensis Peng, 2023

Peng (彭忠亮), Zhongliang, 2023, Studies on the Genus Trachys Fabricius from China (4) - A Faunal Survey of Jiangxi Province and Descriptions of Two New Species (Coleoptera: Buprestidae: Agrilinae: Tracheini), The Coleopterists Bulletin 77 (2), pp. 239-247 : 241-243

11. Trachys jinpenshanensis Peng , new species zoobank.org/ urn:lsid:zoobank.org:act:15E2D926-C87F-4926-BD47-68CAE0B165FA Figs. 2–6

Type Specimen. Holotype ( BPCQ), male, labeled: “ Jinpenshan , 24°55′N 114°46′E, Longxia , Longnan , Jiangxi, China, 13-VIII-2021, Leg. Z-L Peng et Y-Q Cai, 江&省Ê南县Ê下乡ŵȃ山 ”.

Description. Habitus ( Fig. 2 ): Length 3.0 mm, width 1.8 mm; surface uniformly bronze-brown, underside brown with slightly bronze reflections centrally, a rather triangular species. Head ( Fig. 5 ): Widely but narrowly excavated between eyes; vertex transversely and arcuately depressed; frons depressed along midline with an indistinct groove, rather uniformly covered with ocellate sculpture and uniformly clothed with dense golden-yellow pubescence; eyes nearly triangular, inner margins obliquely straight and moderately carinate; antennal sockets situated just above lower margins of eyes, wide and deep, open near sides; clypeus rather unique, golden bronze, metallic and shiny, quite dilated upwards, polygonal, covered with strong transverse or arcuate dense rugae; two frontal holes rather round, situated just above clypeus each side; antennae short, barely reaching anterior margin of pronotum when laid alongside; antennal scape and pedicel both moniliform, 1.50 times as long as wide; antennomeres 3 – 6 cylindrical, much shorter than antennal scape and pedicel and slightly shorter than remaining apical ones, 1.80 times as long as wide; antennomeres 7 – 11 serrate; lateral sides of head oblique from dorsal view, narrower at base than anterior margin of pronotum. Pronotum: 2.96 times as wide as long, widest at base, basal margin 1.68 times as wide as anterior margin in dorsal view, but narrower than elytra at base and much narrower at elytral humeri; lateral margins from base arcuate to basal third, then converging to acute aanterior angles, tips of basal angles rather sharp; anterior margin semicircular, median lobe indistinct; basal edges trisinuate, arcuate in middle, extent of basal margin rather narrow or indistinct; disc convex centrally, uniformly covered with scaly or ocellate sculpture, nearly uniformly clothed with pale-yellow pubescence mixed with a few brown-yellow ones, denser towards anterior angles and sides. Scutellar shield: Very small but clearly visible, triangular, smooth. Elytra: 1.35 times as long as wide, 4.0 times as long as pronotum, widest at humeri; lateral margins from base arcuate to humeri, behind humeri deeply emarginate to posterior third, then sharply attenuate to subapices and arcuately to apices; apices jointly arcuate with sparse but rather sharp apical and lateral denticles; elytral surface slightly convex; humeri strongly projecting beyond elytral outline; basal depressions wide; entire surface nearly uniformly covered with visible black setae, elytral ornamentation consisting of dense pale pubescence mixed with some pale-yellow ones arranged on each elytron including a narrow strip from base to midlength along side, a triangular spot near suture and a narrow transverse band at midlength, a large arcuate spot near side at posterior third, and a small spot at apex. Lateral View ( Fig. 3 ): Thickest point lying at just behind scutellar shield, maximal thickness slightly exceeding length of pronotum plus head; curvature with angle of 120° between pronotal margin and subhumeral lobe; basal part of elytral margin rather obliquely straight with angulate angle above metaventrite, humeral carina rather weak, straightly oblique. Underside ( Fig. 4 ): First abdominal ventrite densely and uniformly covered with pale pubescence, other areas of ventral side with irregular and sparse pale ones; prosternal process clavate, about 1.57 times as long as wide, widest at apical angles; apical angles weakly angulate, lateral margins nearly parallel in basal half, from midlength diverging to apical angles, apical margin arcuate, surface densely clothed with long, pale pubescence; anterior part of prosternum transverse, narrow, anterior margin slightly trisinuate, posterior margin slightly oblique on each side, lateral margins oblique, surface with dense pale pubescence; hypomeron with a sub-reniform depressed marking near inner side; covered with very dense but fine wrinkle; metaventrite uniformly covered with sparse foveae centrally, near anterior margin with strong transverse or arcuate wrinkles, towards sides with dense alveolate sculpture; anterior margin deeply V-emarginate; entire abdominal ventrites densely and nearly uniformly covered with ocellate sculpture, posterior margin of anal ventrite arcuately acuminate, but apical margin of pygidium subtruncate. Legs: Procoxa and mesocoxa globular, posterior coxa expanded as a transverse plate and covered with dense ocellate sculpture and pale pubescence; all trochanters small, nearly triangular; all femora moderately dilated; all tibiae slender and rather straight with sparse pale-yellow pubescence; all tarsi light yellow; each claw with a very short but sharp tooth at base. Aedeagus ( Fig. 6 ): Length 1.1 mm, width 0.3 mm; brown-yellow, but along sides and inner half of apical part of parameres blackbrown; phallobase narrow but relatively long, much narrower than parameres at base, about 0.3 times the total aedeagus; tegminal strut dilated and long, apical margin rather angulate; parameres gradually diverging from base to subapices, then sharply tapering to apices; median lobe very wide, slightly longer than tegmen, strongly sclerotized apically and laterally, membranous centrally. Sexual dimorphism: female unknown.

Differential Diagnosis. This species is rather close to Trachys ohbayashii Kurosawa, 1954 from Japan, but in the new species the humeri are much more strongly projected, the elytral margins are more deeply emarginate behind humeri, and the elytral ornamentation in both species is distinctly different.

Etymology. The specific epithet refers to the locality Jinpenshan, Longnan County in south Jiangxi Province where the holotype was collected.

Figures

Figs. 2–10. New species of Trachys, holotypes. T. jinpenshanensis, new species, male: 2) Dorsal view; 3) Lateral view; 4) Ventral view; 5) Head-frontal view; 6) Aedeagus. T. parviformis, new species, female: 7) Lateral view; 8) Dorsal view; 9) Ventral view; 10) Head-frontal view.