258 



Orthorrhapha brachycera. 



Ent. Soc. XXVIII, 1902, 208, PI. V, figs. 12, 17, 24) as nigra Meig. 

 is not assimilis as is shown with certainty by the figure of the wing, 

 which has the cross-veins nmch nearer to each other than assimilis. 

 About Walker's statement (List of the Spec. of Dipt. Ins. in the Goll. 

 of the Brit. Mus. III, 1849, 511) I can say nothing. 



4. D. exilis Meig. 



1822. Meig. Syst. Beschr. III, 91, 1, Tab. XXIII, Fig. 25—28, et VI, 

 344. — 1859. Loew, Neue Beitr. zur Kenntn. d. Dipt. VI, 42, 10. — 1862. 

 Schin. F. A. I, 95. — 1903. Kat. palåarkt. Dipt. II, 273. 



Male. Frons and vertex black; ocellar triangle with four short 

 bristles; epistoma black; palpi greyish. Occiput black, above with a 

 pair of short bristles and some smaller hairs. Antennæ black, the 

 second joint with a very short bristle below. Thorax black, shining, 

 with short, somewhat adpressed, yellowish grey pubescence; the disc 

 has a couple of longer, black bristles behind. There are some black 

 notopleural and a postalar bristle, perhaps also a supraalar bristle. 

 Scutellum with two black marginal bristles and some very small hairs. 

 Plem^a black, shining. Abdomen black, somewhat shining, with short, 

 yellowish grey, towards the sides darker hairs. Venter similarly co- 

 loured and haired. Legs black, front coxæ and all trochanters yellow- 

 ish, front tibiæ yellowish to brownish; sometimes also the front fe- 

 mora, the middle tibiæ and the apex of the hind tibiæ yellowish to 

 brownish and all tarsi brownish. The legs are short-haired, front fe- 

 mora with very small bristles at the apex on both sides, middle 

 femora with a longer bristle on the anterior side, hind femora with 

 a pair of bristles below at the apex; all femora with fine hairs below; 

 hind tibiæ with fine hairs on the dorsal side among which a few 

 stronger hairs. Tibiæ without apical spurs. The hairs pale, the 



Fig. 116. Wing of D. exilis. 



bristles blackish. Wings brownish tinged, especially on the anterior 

 part. Veins blackish brown to black, the subcostal vein somewhat 



