Compsiluroides meifengensis sp. nov.

(Figs 4, 20–26)

Type material. HOLOTYPE Ƌ (NMNS): [T A I W A N] Nantou, Meifeng / 24°05'22.2"N, 121°10'27.3"E, 2100m / 18.viii.2015, H. Shima leg. // HOLOTYPE / Compsiluroides meifengensis / Huang & Tachi, 2019.

PARATYPES. China: 1 Ƌ (KUM), Sichuan, Dujangyan Shi, Qingchen Shen, 1300m, 12–13.viii.1993, H. Shima leg. Taiwan: 1 ♀ (NMNS), Nantou, Meifeng, 18.viii.2015, H. Shima leg. ; 1 Ƌ (BLKU), Nantou, Meifeng, 18.viii.2015, T. Tachi leg. ; 1 ♀ (NMNS), Kaohsiung, Maolin, Tona forest rd., 17K [road sign], 29.iv.1998, W.T. Yang leg.

Diagnosis. Lower facial margin not protruded in lateral view; prementum short, about 3 times as long as wide; gena wider than 1/5 of eye height in female; surstylus tapered to apex in dorsal and lateral views.

Description. Body length: 5.3–7.6 mm.

Male. Head grayish-white pollinose, fronto-orbital plate brownish-gray; antenna and arista black; palpus yellow. Vertex 0.23–0.25 of head width; inner vertical seta strong, about 0.6 of eye height; outer vertical seta present, 0.4–0.5 times as long as inner vertical seta; ocellar setae present, slightly shorter than anterior reclinate orbital seta; frontal vitta widened anteriorly, about 1.7 times as wide as fronto-orbital plate at middle; 6 frontal setae, lowest seta at level of middle of pedicel; 2 reclinate orbital setae, anterior seta stronger than posterior one; parafacial bare, slightly narrowed in lower part, 0.75–0.85 times as wide as 1 st flagellomere at mid-height; face concave; facial ridge with several setae on lower 7/10; lower facial margin not protruded in lateral view; vibrissa arising at level of lower margin of face; compound eye hairy; gena 1/7–1/6 of eye height; occiput flattened; upper occiput with 1–2 rows of black setose; antenna not reaching level of lower facial margin; 1 st flagellomere 4–4.5 times as long as pedicel, about 3 times as long as wide; arista thickened on basal 0.3, 2nd aristomere about as long as wide; palpus weakly clavate, about 0.8 times as long as 1 st flagellomere; prementum about 3 times as long as wide.

Thorax black in ground color; postpronotal lobe and notopleuron densely grayish-white pollinose, other portions of scutum and scutellum thinly gray pollinose; presutural area with 3 longitudinal gray vittae; pleurae rather densely grayish-white pollinose. Two postpronotal setae; 3 presutural and 3 postsutural acrostichal setae, first presutural seta fine; 3 presutural and 3 postsutural dorsocentral setae; 2 presutural and 3 postsutural intra-alar setae, first presutural seta fine; 1 presutural and 3 postsutural supra-alar setae, first postsutural seta fine; proepisternum bare; 3 katepisternal setae, lower anterior seta 0.6 times as long as upper one; anatergite bare; scutellum with 3 pairs of marginal setae, basal seta strong, subapical setae strong and divergent, about as long as lateral seta; a pair of discal setae sometimes present. Wing hyaline, slightly tinged with pale brown anteriorly; tegula and basicosta black; lower calypter pale yellowish-brown. Second costal sector setose ventrally; relative lengths of 2nd, 3rd and 4th costal sectors approximately 1:2.25:1; distance of vein M from crossvein dm-cu to bend about 2.75 times distance between bend and wing margin. Legs black, pulvilli pale yellowish-brown. Fore tibia with 2 posterior, 1 preapical dorsal and 1 preapical posteroventral setae; mid tibia with 1 anterodorsal, 2 posterodorsal, 1 ventral, 1 preapical anterodorsal, 1 preapical posterior and 2 preapical ventral setae; hind tibia with 4 anterodorsal, 2 posterodorsal, 2 ventral, 2 preapical dorsal and 1 preapical ventral setae; claws and pulvilli longer than 5th tarsomere.

Abdominal dorsum black in ground color, whitish pollinose on anterior 1/5 of tergite 3, 2/5 of tergite 4, and 1/2 of tergite 5; mid-dorsal longitudinal vitta distinct on tergites 3–5. Syntergite 1+2 and tergite 3 with pairs of median and lateral marginal setae; tergite 4 with 7 marginal setae; tergite 5 with 7 marginal setae; sternite 5 with V-shaped cleft bearing some setae. Postabdomen. Epandrium nearly trapezoidal in lateral view, with some setae; surstylus slender, tapered to apex in lateral view, tapering and curved inward, with some setae in apical 1/ 4 in dorsal view; cercus pointed apically in lateral view, nearly triangular, with dense setae along entire length in dorsal view; hypandrial arms not fused; pregonite fused with hypandrium ventrally at base, nearly rectangular, with some setae dorsally; postgonite nearly square and rounded apically; epiphallus short, subequal in length to postgonite; distiphallus membranous medially with many spinules ventrally in lateral view, apex narrowly rectangular in dorsal view.

Female. Differs from male as follows: vertex about 0.29 of head width; gena 2/9–1/4 of eye height; scutellum with apical setae, parallel to slightly divergent, horizontal [hair-like in 1 specimen].

Etymology. This species is named after the type locality Meifeng (Nantou, Taiwan).

Distribution. China (Sichuan), Taiwan.

Remarks. Compsiluroides meifengensis sp. nov. is similar to C. flavipalpis . However, it can be distinguished from this species by surstylus tapered to apex in lateral view and cercus wider in dorsal view in male and gena wider, more than 1/5 of eye height, in female. The type specimens were collected from mountainous areas between 1300 and 2100 m.