Tephrochlamys pengi sp. nov.

(Figs. 28–39)

Diagnosis. Dorsal side of first flagellomere flat with slight protrusion near base before arista (visible in lateral view). Scutum with one pair of dark brown stripes in middle discontinuously on presutural scutum and two pairs of dark brown short stripes on each side. Wing tinged with brown anteriorly, crossveins r-m and dm-m with infuscate markings on the membrane. Calypter and alula nearly hyaline, with brownish yellow hairs. All femora slightly thickened. Fore femur with single row of 8 long anterodorsal setae, but without anteroventral seta. Abdominal tergites 2–5 with widely darkened band.

Description. Male. Body length 5.0 mm, wing length 5.2 mm [Holotype ♂].

Head (Fig. 31) brownish yellow with pale pruinesence; ocellar triangle brown, frons brownish orange without conspicuous dark marking, front half paler than posterior one, occiput almost brown; gena almost yellowish white, but posteriorly slightly brownish yellow. Eyes brownish orange. Hairs and setae on head dark brown. 2 fronto-orbital setae and ocellar setae missing due to damage. Gena with 5–6 irregular postgenal setae. Antenna brownish orange, scape with black short setae dorsoapically; pedicel with 1 black dorsoapical seta, a circle of black ventroapical setae. First flagellomere long and oval, with pale brownish yellow velvet, 0.31 times as long as head height, dorsal side of first flagellomere flat, with slight protrusion near base before arista (visible in lateral view, Fig. 31); arista pubescent, brownish yellow, 3.45 times longer than first flagellomere. Proboscis pale brownish yellow with 1 strong vibrissa, hairs pale grey; palpus with 1 apical seta and 1 subapical seta nearly same in length.

Thorax (Fig. 29) dark brown, mesonotum with pale grey pruinesence; scutellum brown yellow with dark brown margin. Scutum with one pairs of stripes in middle discontinuously on presutural scutum and two pairs of short stripes on each side. Hairs and setae on thorax dark brown. Postpronotum with one pair of setae. 1 well developed postpronotal seta and 5 short setae; 3 postsutural dorsocentral seta miss, anterior one shorter than posterior two, 1 st dorsocentral seta closer to 2 nd than to suture, 4 irregular rows of acrostichal setae between them after suture; katepisternum and propleuron each with 1 seta, katepisternum with a regular row of several short setae, a pair of prescutellar setae. Scutellum yellowish brown to dark brown margin, with two pairs of scutellar setae.

Wing (Fig. 32) nearly hyaline, slightly brownish, anteriorly tinged with brown; veins brownish yellow, crossveins r-m and dm-m with infuscate markings on the membrane; costal spines inconspicuous. Calypter and alula nearly hyaline, with brownish yellow hairs. Halter yellowish white.

Legs almost yellowish. Fore femur brownish yellow except apex yellowish, mid femur subapically tinged with brownish yellow, hind femur subapically tinged with brownish yellow ventrally; all tibiae and tarsi darkened towards apex, hind tibia tinged with brown dorsally. Hairs and setae on legs dark brown. All femora slightly thickened. Fore femur with a row of 8 long anterodorsal setae, but without anteroventral seta.

Abdomen dark brownish dorsally, but tergites 2–5 with widely darkened posterior band. Hairs and setae on abdomen dark brown. Tergites 2–5 with a row of longer setae at posterior margin.

Male genitalia (Figs. 33–39): Epandrium (Figs. 33–35) small, dark yellow, sparsely with black thick setae different in length. Hypandrium symmetrical. Surstylus (Figs. 36, 37) almost trapezoid in lateral view, about 0.77 times as long as basal width, with distinctly thickened and pointed process at apex, posterior margin straight, 4 widely spaced setae near the apex towards the central area of the edge on outer surface, about 20 setae gather towards the base on one side away from the apex, with several sparse setae along the edge on inner surface, with central area nearly bare, and 2 seta in the middle. Cercus (Figs. 34, 35) dark yellow, almost transparent, symmetrical and thin, apically narrow, with a row of long setae.

Female. Unknown.

Type material. Holotype ♂, Fujian, Wuyishan, Huanggangshan [27°50'15.3"N, 117°46'43.23"E], 1930 m, 2022. VI-VII, Lingfei Peng (Malaise trap) (CAU).

Distribution. China (Fujian).

Remarks. The new species is similar to the Oriental species T. wuyishanensis sp. nov. and T. javanensis Frey, 1934, but it is distinguished from it by the following characteristics: (1) The first flagellomere is partially rounded and slightly flattened on the dorsal side (while it has a rounded shape in T. wuyishanensis sp. nov. and T. javanensis Frey, 1934); (2) 4 irregular rows of acrostichal setae after suture (while it 6 irregular rows in T. wuyishanensis sp. nov.); (3) crossveins r-m and dm-m with infuscate markings on the membrane (while in T. javanensis, they are without such markings); (4) similar to T. wuyishanensis sp. nov., the abdomen is yellowish brown (while in T. javanensis, the abdomen is entirely black, dusted with greenish-gray); (5) the dorsal side of the first flagellomere is flat, exhibiting a slight protrusion near the base, before the arista (visible in lateral view) (while in T. variegata sp. nov., the dorsal side is also flat, but there is no protrusion process before the arista; T. javanensis has a round first flagellomere).

Etymology. The species is named after the collecter Mr. Lingfei Peng (Fujian).