406 Orthorrhapha brachycera. 



I have kept the genus here, though I am not sure that this is 

 correct; it is one of Mik's numerous genera, which were not all valid. 

 The character from the scutellar bristles is a slight one; in T. rufi- 

 cornts the outer bristles are small, and moreover varying in size, 

 sometimes very small. The difference in the thoracic bristles is also 

 questionable, and when all species of Thinophilus are examined (my 

 generic description is chiefly based on ruficornis) I doubt whether the 

 characters will hold good. 



Of the genus only one species is known, also occurring in Denmark. 



1. S. versutus Walk. 



1851. Walk. Ins. Brit. I, 192, 3 (Thinophilus). — 1855. Zett. Dipt. 

 Scand. XII, 4641, 3 {Thinophilus). — 1903. Kat. palaarkt. Dipt. II, 352. - 

 1909. Strobl, Verhandj. zooL bot. Geseli. Wien, LIX, 188. — Pseudacropsilus 

 macuUpennis Strobl, 1899. Wien. ent. Zeitg. XVIII, 123, 79. 



Male. Vertex and frons brown. Epistoma broad, brov^n. Palpi 

 brownish. Occiput slightly greenish, grey pruinose; postocular bristles 

 black above, yellowish below. Antennæ blackish, a little yellowish 

 at the base and below; arista practically apical, Thorax greyish 

 brown, dull. Pleura slightly greenish or æneous, grey pruinose; pro- 

 pleura with some pale hairs among which a pair of bristles. Abdomen 

 very slightly greenish or æneous, grey pruinose; it is thinly clothed 

 with short, black hairs, and has small hindmarginal bristles at the 

 sides, longer on the first segment. Venter grey. Legs with the coxæ 

 grey, femora blackish, a little greyish pruinose; the apex of thefemora, 

 the tibiæ and tarsi yellowish brown or reddish brown, the tarsi darker 

 at the apex. The legs have short, blackish hairs; posterior coxæ 

 each with a black bristle; the femora have a little longish, distantly 

 placed hairs below, and at the apex a pair of bristly hairs below on 

 each side; posterior femora with a preapical bristle; the front tibiæ 

 are short ciliated below, without bristles above; middle tibiæ with 

 about two antero-dorsal and two postero-dorsal bristles, but no ven- 

 tral bristles, and hind tibiæ with some few bristles on the dorsal and 

 antero-dorsal sides. Wings somewhat grey or brownish tinged; veins 

 black; the discai vein straight, parallel with the cubital vein; the 

 posterior cross-vein is slightly blackish seamed, and on the middle 

 of the last part of the discai vein is a faint blackish spot. Squamulæ 

 dirtily whitish, with a very short^ pale fringe. Halteres yellow or a 

 little brownish. 



Female. Epistoma broader than in the male, greyish brown; for 

 the rest quite similar to the male. 



