Trachys aureolus 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 : 753-755

Trachys aureolus Peng , new species

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( Figs. 11 – 14 )

Type Specimens. Holotype ( BPCQ), male, genitalia dissected, mounted on cover slip, and pinned with holotype, labeled: “ Jiulong Forest Reserve , altitude 600 m, 28°32′N 114.53′E, Wanzhai , Jiangxi, China, 01-V-2020. Leg. Z-L. Peng et Y-Q. Cai ” . Paratypes ( ZLPN), 3 females, each labeled: “ Jiulong Forest Reserve , altitude 600 m, 28°32′N 114.53′E, Wanzhai , Jiangxi, China, 01-V-2020. Leg. Z-L. Peng et Y-Q. Cai ” ; 1 male, genitalia dissected and mounted on cover slip and pinned with the paratype, labeled: “ Nanhualing Village , altitude 300 m, 30°33′N 118.79′E, Hule, Ningguo , Anhui, China, 12-VIII-2020, Leg. Z-L. Peng et Y-Q. Cai ” ; 1 male, genitalia dissected and mounted on cover slip and pinned with the paratype, labeled: “ Xianyushan , altitude 600 m, 29°56′N 117.22′E, Qimen , Anhui, China, 12-VIII-2020, Leg. Z-L. Peng et Y-Q. Cai ” .

Description. Habitus ( Fig. 11 ): Length 3.0 mm, width 1.8 mm; surface uniformly dark golden-yellow, underside brown with yellow reflections; a long ovate species. Head: Widely and deeply excavated between eyes; vertex transversely convex, covered with dense, yellow pubescence mixed with sparse, pale pubescence; frons deeply depressed along midline with a distinct longitudinal groove, covered with sparse, pale-yellow and semi-recumbent pubescence; eyes reniform, genae very short; antennal sockets situated just above lower margins of eyes, round and deep; clypeus metallic bronze and shiny; anterior margin arcuately and deeply emarginate; clypeal suture slightly arcuate; lateral sides weakly narrowed at midlength; antennae very short, barely reaching anterior margin of pronotum when laid alongside; antennal scape and pedicel moniliform, as long as wide; antennomeres 3 – 6 subcylindrical, much shorter than scape and pedicel and slightly shorter than remaining apical ones, 1.21 times as long as wide; antennomeres 7 – 11 serrate. Pronotum: About 2.9 times as wide as long, widest at base, nearly as wide as elytra at base but distinctly narrower than at elytral humeri; lateral margins from base sharply converging to acute anterior angles; anterior margin biarcuate, median lobe broadly but only slightly anteriorly produced; both inner and outer basal edges trisinuate with rather angulate median lobe, extent of basal margin between inner and outer edges wide and transversely equal; disc convex medially, slightly depressed along basal and lateral margins, surface uniformly covered with ocellate sculpture, irregularly clothed with yellow pubescence mixed with several white pubescent spots. Scutellar shield: Very small but clearly visible, triangular, smooth. Elytra: 1.35 times as long as wide, about 4.6 times as long as pronotum, widest at humeri; lateral margins slightly diverging from base to humeri, slightly emarginate from humeri to midlength, then gradually and arcuately converging to apices; apices jointly arcuate without distinct apical and lateral denticles; elytral surface slightly convex; humeri markedly projecting beyond elytral outline; humeral depressions wide; entire surface irregularly covered with coarse rugae and foveae, nearly uniformly clothed with golden-yellow mixed with white pubescence; ornamentation consisting of white pubescence arranged on each elytron as follows: spot at humeral depression, on humerus, and at basal third near suture, an oblique zigzag band at midlength, and two parallel transverse zigzag bands on posterior half. Lateral view ( Fig. 13 ): Thickest point lying at basal third of elytra; maximal thickness greatly exceeding length of head plus pronotum; curvature with angle of about 120° between pronotal margin and subhumeral lobe; basal part of elytral margin obliquely straight with angulate angle above metaventrite; humeral carina indistinct, humerus smooth and shiny. Underside ( Fig. 12 ): Nearly uniformly clothed with short, pale pubescence; prosternal process about 1.8 times as long as wide, widest at apical angles; lateral marginal carinae strong, diverging from base to apical angles, entire apical half fan-shaped, apical angles arcuate, apical margin more or less arcuate but slightly angulate apically, surface depressed, with sparse, yellow pubescence; anterior part of prosternum butterfly-like, anterior margin arcuately anteriorly produced at middle, posterior margin obliquely arcuate inwards laterally; surface slightly depressed, densely covered with pale-yellow pubescence; hypomeron smooth, hypomeral marking footprint-shaped, narrowed near inner side; metaventrite with sparse ocellate sculpture centrally with strong reticulate wrinkles near sides and along anterior margin, anterior margin with deep V-shaped emargination; first ventrite of abdomen covered with longitudinal wrinkles; second ventrite with indistinct ocellate sculpture, remaining ventrites smooth without distinct sculpture; posterior margin of anal ventrite arcuate apically. Legs: Procoxa and mesocoxa globular, metacoxa 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; all tarsi bright yellow; each claw with a short, obtuse tooth at base. Aedeagus ( Fig. 14 ): Length 0.90 mm, width 0.20 mm; entirely yellow brown; phallobase long, about 0.40 times the total length; basal knots distinct, black; basal median lobe prolonged backwards; lateral sides of parameres slightly diverging from base to apical third, dilated as a fan-shaped lobe at apical third, then sharply tapering to apices; median lobe cylindrical, rather acuminate apically. Sexual dimorphism: Sexes very similar; female slightly larger in size, more attenuate posteriorly.

Differential Diagnosis. This species resembles Trachys purpuratus Peng, 2021 , but differs by its golden yellow color and the elytra quadrate only in the anterior half and more attenuate posteriorly, while T. purpuratus is dark purple with the elytra quadrate in the anterior two-thirds and moderately attenuate posteriorly. The prosternal process is also different between the two species; in T. aureolus the apical half is very widely dilated and fan-shaped, while in T. purpuratus the apical half is only slightly dilated and arcuate.

Etymology. The specific epithet “ aureolus ” is a Latin adjective meaning golden-yellow, referring to the body color of the new species.

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.

Figs. 13–21. Holotypes of new species of Trachys. T. aureolus, new species, holotype, male: 13) Lateral view; 14) Aedeagus (dorsal view). T. quadripennis, new species, holotype, male: 15) Dorsal view; 16) Ventral view; 17) Lateral view; 18) Aedeagus (dorsal view). T. scapulis, new species, holotype, female: 19) Dorsal view; 20) Lateral view; 21) Ventral view.