Compsiluroides Mesnil, 1953

Huang, Yu-Zen & Tachi, Takuji, 2019, Taxonomic review of the genus Compsiluroides Mesnil (Diptera: Tachinidae), with the description of a new species, Zootaxa 4608 (2), pp. 345-356 : 346-347

Compsiluroides Mesnil, 1953

Compsiluroides Mesnil, 1953: 105 . Type species: Compsiluroides communis Mesnil, 1953 , by monotypy.

Redescription. Male. Head grayish-white pollinose, fronto-orbital plate brownish-gray; antenna black; palpus black or yellow. Vertex 0.22–0.29 of head width; inner vertical seta strong, 0.6–0.9 of eye height; outer vertical seta present, 0.2–0.5 times as long as inner vertical seta; ocellar setae present, slightly shorter than anterior reclinate orbital seta; frontal vitta widened anteriorly, 1.1–2.5 times as wide as fronto-orbital plate at middle; 6–7 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, 0.7–1.7 times as wide as 1 st flagellomere at mid-height; face concave; facial ridge with several setae on lower 3/8–3/5; vibrissa inserted at level of lower facial margin; compound eye hairy; gena 1/7–2/7 of eye height; occiput flattened; upper occiput with 1–2 rows of black hairs. Antenna not reaching level of lower facial margin; 1 st flagellomere 2–5 times as long as pedicel and 3–5 times as long as wide; arista thickened in basal 0.1–0.3, 2nd aristomere about as long as wide. Palpus weakly clavate, 0.7–1.0 times as long as 1 st flagellomere ; prementum 3–5 times as long as wide; labella pad-like.

Thorax black in ground color; postpronotal lobe and notopleuron densely grayish-white pollinose; scutum thinly gray pollinose, presutural part with 3 longitudinal gray vittae; scutellum thinly gray pollinose; pleurae rather densely grayish-white pollinose. Two postpronotal setae; 3 presutural and 3 postsutural acrostichal setae, first presutural seta short; 3 presutural and 3 postsutural dorsocentral setae; 2 presutural and 3 postsutural intra-alar setae, first presutural seta short; 1 presutural and 3 postsutural supra-alar setae, first postsutural seta short; proepisternum bare; 3 katepisternal setae, lower anterior seta 0.5–0.8 times as long as upper one; anatergite bare; scutellum with 3–4 pairs of marginal setae, basal setae strong, subapical setae strong and divergent, about as long as lateral setae, apical setae, if present, parallel to divergent, horizontal, fine or hair-like, 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 1:2–3:1–1.5; distance from crossvein dm-cu to bend of vein M 2.2–3.0 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 2–4 anterodorsal, 2 posterodorsal, 2 ventral, 2 preapical dorsal and 1 preapical anteroventral setae; claws and pulvilli longer than 5th tarsomere.

Abdominal dorsum black in ground color, whitish pollinose on anterior 1/3 of tergite 3, 2/5 of tergite 4, and 1/2–2/3 of tergite 5; mid-dorsal longitudinal vitta distinct on tergites 3–5. Syntergite 1+2 not excavated to hind margin; syntergite 1+2 and tergite 3 with pairs of median marginal and lateral marginal setae; tergite 4 with 6–12 marginal setae; tergite 5 with 6–12 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, curved inward at apex in dorsal view; cercus varied in width, pointed apically in lateral view, nearly triangular and densely setose on almost entire length in dorsal view; hypandrial arms not fused; pregonite fused with hypandrium at base ventrally, nearly rectangular with some setae dorsally; postgonite nearly square and rounded apically; epiphallus short, subequal in length to postgonite; phallus with distiphallus membranous medially and dorsally at apex, sclerotized with many spinules ventrally.

Female. Differs from male as follows: vertex 0.25–0.32 of head width; gena 1/6–1/3 of eye height; frontoorbital plate with 2 proclinate orbital setae and 4–6 frontal setae; claws and pulvilli shorter than 5th tarsomere. Postabdomen. Tergite 6 nearly rectangular with setae posteriorly; sternite 6 nearly fan-shaped with setae posteriorly; spiracles of 6th and 7th segments located near tergite 6; tergite 7 nearly rectangular, with setae posteriorly; sternite 7 swollen posteroventrally, with setae posteriorly; tergite 8 nearly rectangular, without setae; sternite 8 nearly semicircular, with setae; epiproct nearly oval, with or without setae; cerci nearly oval, with hairs posteriorly and dorsally; hypoproct curved ventrally at base, with setae on posterior half.

Remarks. The long and inward-curved surstylus (dorsal view) is a feature exclusive to Compsiluroides that is not found in most other species of Blondeliini. This character state is possibly an autapomorphy of the genus. The female postabdomens are similar in all species of the genus. Compsiluroides is here newly recorded from Nepal and Taiwan.