Trachys langyashancola Peng, 2024

Peng, Zhongliang, 2024, Studies on the Genus Trachys Fabricius from China (5) - Descriptions of Two New Species (Coleoptera: Buprestidae: Agrilinae: Tracheini), The Coleopterists Bulletin 78 (1), pp. 76-80 : 78-79

Trachys langyashancola Peng , new species

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( Figs. 6–10 )

Chinese Common Name: DZ琊潜吉丁

Type Specimen. Holotype ( BPCQ), male, labeled: “Langyashan, 32°15ʹN 118°16ʹE, Langya, Chuzhou, Anhui, China, 31-V-2023, Leg. Z-L. Peng et X-Q. Sheng, Ŕ徽省Ñ州市DZ琊区DZ琊山ª区 ”.

Description. Habitus ( Fig. 6 ): Length 2.50 mm, width 1.60 mm; head and pronotum brown with strong, rusty bronze reflections, elytra brown with slightly bronze reflections, underside brown with rusty bronze reflections, stronger centrally; a small and granular species. Head ( Fig. 9 ): Widely excavated between eyes; vertex transversely and arcuately flattened, uniformly covered with distinct scale-like or ocellate sculpture and clothed with pale pubescence; frons depressed along midline with a very fine longitudinal groove, nearly uniformly covered with pale pubescence and indistinct ocellate sculpture; eyes reniform, inner margins carinate and biarcuate; antennal sockets situated just above lower margins of eyes, circular and widely open near sides; two frontal pits round, situated just above clypeus on each side; clypeus dark bronze-green, rather quadrate, nearly as long as wide; anterior margin with a semicircular notch, clypeal suture indistinct, lateral sides narrowed at midlength; surface covered with very dense and strong transverse wrinkles extending upwards to area between two frontal pits; antenna short, barely reaching anterior margin of pronotum when laid alongside; antennal scape clavate, about 2.00 times as long as wide, pedicel moniliform, 1.50 times as long as wide, smaller than scape; antennomeres 3–6 also moniliform but much smaller than antennal scape and pedicel and slightly smaller than remaining apical ones, 1.20 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: 2.60 times as wide as long, widest at base, basal margin 1.62 times as wide as anterior margin in dorsal view, much narrower than elytra at base and at humeri; lateral margins generally oblique but deeply emarginate at basal third; anterior margin biarcuate with median lobe slightly produced forwards; median lobe with inner basal edge arcuate but that of outer basal edge truncate, extent of margin between outer and inner edges narrow and transversely unequal; disc convex medially, slightly depressed along basal and lateral margins, surface uniformly covered with scaly or ocellate sculpture, nearly uniformly clothed with mainly pale mixed with very sparse, brown-yellow pubescence. Scutellar shield: Very small but clearly visible, typically triangular, smooth. Elytra: 1.30 times as long as wide, 3.60 times as long as pronotum, widest at humeri; lateral margins from base to humeri arcuate, from humeri sightly emarginate to just behind midlength, then very sharply attenuate to apices; apices jointly arcuate without distinct apical and lateral denticles; elytral surface rather convex; humeri strongly projecting beyond elytral outline; basal depressions wide; surface in anterior half near suture covered with a few coarse foveae; ornamentation consisting of dense, pale pubescence mixed with a few brown-yellow setae and arranged on each elytron as three spots on anterior half and two transverse bands on apical half with some extra pale pubescence near apex. Lateral view ( Fig. 7 ): Thickest behind scutellum, maximal thickness greatly exceeding length of pronotum plus head; curvature with angle of 130° between pronotal margin and subhumeral lobe; pronotal margins obliquely straight; basal part of elytral margin obliquely straight, angulate above metaventrite, humeral carina indistinct, marked by only an arcuate, convex trace. Underside ( Fig. 8 ): Nearly uniformly covered with short, pale pubescence, slightly denser on abdomen; anterior part of prosternum nearly butterfly-shaped, anterior margin emarginate, surface with irregular pale pubescence; prosternal process 1.30 times as long as wide, fan-shaped, widest at apical angles; apical angles rather angulate, lateral margins sharply converging from apical angles to midlength, then gently converging to base; apical margin semicircular; surface depressed and smooth, sparsely scattered with a few pale setae; hypomeron with a depressed reniform marking near inner side; mesoventrite divided by prosternal process; metaventrite rather smooth centrally with weak coarse foveae, covered with strong arcuate wrinkles or reticulate sculpture near sides and anterior margin; anterior margin deeply emarginate; first abdominal ventrite covered with dense longitudinal reticulate sculpture, remaining ventrites with ocellate sculpture, posterior margins of anal ventrite and pygidium arcuate and slightly acuminate medially. Legs: Procoxa and mesocoxa globular, posterior coxa expanded as a transverse plate and covered with ocellate sculpture; all trochanters small, nearly triangular; all femora moderately dilated; all tibiae slender and slightly lobate; length of tarsi rather short, much shorter than claw, brown dorsally, dark yellow ventrally; each claw brown with a swollen tooth at base. Aedeagus ( Fig. 10 ): Length 0.50 mm, width 0.20 mm; brown-yellow except along sides and whole apical third of parameres which are black-brown; phallobase wide, subrectangular, slightly narrower than parameres at base, length 0.33 times total aedeagal length, sides parallel, apical margin truncate; tegminal strut very short, apical margin angulate; parameres diverging from base to apical fourth, then sharply converging to apices; median lobe slightly longer than tegmen, strongly sclerotized apically and laterally, membranous centrally, midpiece parallel, blunt apically. Sexual dimorphism: Female unknown.

Differential Diagnosis. This species resembles Trachys pseudoscrobiculatus pseudoscrobiculatus Obenberger, 1940 from Japan, but is much shorter, the entire apical third much more tapered, the lateral pronotal margins more deeply emarginate at the posterior third, and with a completely different male aedeagus.

Etymology. The species name is a combination of two words, “Langyashan”, the mountain name of the type locality in Chuzhou city of Anhui Province, and the Latin verb “colo”, meaning to inhabit. It is to be treated as a noun in apposition.

Figures

Figs. 1–10. New species of Trachys, holotypes. T. semicircucollis, new species, male, 2.9 mm: 1) Dorsal view; 2) Lateral view; 3) Ventral view; 4) Head, frontal view; 5) Aedeagus (fully dissected). T. langyashancola, new species, male, 2.5 mm: 6) Dorsal view; 7) Lateral view; 8) Ventral view; 9) Head, frontal view; 10) Aedeagus (fully dissected).