Empididae. 259 



near to the margin; the apex of the cubital vein curved a little up- 

 wards, thin and nearly evanescent before reaching the margin; the 

 discai vein thin from the base to considerably behind the postical 

 cross-vein; the cross-veins near to each other; a thin anal vein indi- 

 cated. Halteres black or brownish black. 



Female. Quite similar to the male; abdomen more pointed. 



Length 1,5 — 2 mm. 



D. exilis seems to be the most common of our species; Amager, 

 Ørholm, at Skelskør; on Langeland at Lohals, and on Bornholm 

 at Rønne; at Lohals I caught the species in rather great numbers 

 with the net on a clover-field. My dates are only ^^/r — -'h. 



Geographical distribution: — Northern and middle Europe down 

 into France; its northern limit is hitherto in Denmark. 



5. D. pusilla Loew. 



1859. Loew, Neue Beitr. zur Kenntn. d. Dipt. VI, 42, 9. — 1862. 

 Schin. F. A. I, 96. — 1903. Kat. palåarkt. Dipt. II, 274. — Drapetis 

 exilis (non Meig.) : 1842. Zett. Dipt. Scand. I, 328, 2. 



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

 bristles; palpi greyish. Occiput blackish, with a pair of bristles and 

 short hairs above. Antennæ black, second joint with a very short 

 bristle below. Thorax black, shining, with a short, somewhat ad- 

 pressed, brownish pubescence, behind there is a pair of longer, black 

 bristles. Small notopleural and a postalar bristle present. Scutellum 

 with two black marginal bristles and some small hairs. Pleura black, 

 shining. Abdomen black, slightly shining, with short, dark brown 

 hairs. Venter black. Legs black, anterior femora more or less brown 

 at the apex, front tibiæ yellowish brown, middle tibiæ more or less 

 brown and hind tibiæ brown towards the apex; tarsi brown. Legs 

 short-haired with brownish hairs; front femora with a small bristle 



Fig. 117. Wing of B. pusilla. 



at the apex on the posterior side, and middle femora with a similar 

 bristle on the anterior side. Tibiæ without apical spurs. Wings hya- 



17* 



