256 Orthorrhapha brachycera. 



eye-margin, with two long, black bristles above. Antennæ black, the 

 second joint with a somewhat long bristle below; the third joint 

 somewhat elongated. Thorax black, shining, with a somewhat ad- 

 pressed, greyish pubescence and beset with somewhat long, black 



Fig. 114. Antenna of D.setigera. x 100. 



bristles, representing both dorsocentral and acrostichal bristles. Further 

 a posthumeral bristle, some notopleural and a postalar bristle, all 

 black, but they are fused with other bristles on the sides of the disc. 

 Scutellum with two long, black marginal bristles and smaller hairs. 

 Pleura black, shining. Abdomen likewise black, shining, with a short, 

 pale pubescence. Venter similarly coloured and haired, the hairs to- 

 wards the apex darker. Legs black, trochanters and knees reddish, 

 generally the tibiæ, especially the hind tibiæ, and the tarsi brownish 

 to reddish. The anterior femora with bristles at the apex on the 

 anterior and posterior side, the one on the anterior side strengest, 

 especially on the middle femora; the hind femora with a few bristles 

 below towards the apex; the anterior tibiæ with apical spurs, the 

 hind tibiæ with a row of strong bristles on the antero-dorsal side. 

 The hairs are yellowish or brownish, the bristles black. Wings hyaline. 

 Veins paler or darker brown; the cross-veins near to each other; the 

 discai vein thin from the medial cross-vein to somewhat beyond the 

 postical cross-vein; a thin anal vein indicated. Halteres whitish yellow 

 to yellow. 



Female. Quite similar to the male with exception of the pointed 

 abdomen. 



Length 1,8 — 2,3 mm. 



D. setigera is somewhat rare in Denmark, but has been taken on 

 several localities; at Copenhagen; on Falster at Resle; on Funen at 

 Hoffmansgave; on Fænø, and in Jutland at Horsens and at Gjerlev 

 near Randers Fjord; the dates are ^^/^—'^^h. 



Geographical distribution : — Northern and middle Europe down 

 into Germany; its northern limit lies in Demark. 



3. D. assimilis Fall. 

 1815. Fall. Dipt. Suec. Empid. 8,5 et 34,5 {Tachydromia). — 1859. 

 Loew, Neue Beitr. zur Kenntn. d, Dipt. VI, 41,8 {affinis, lapsus). — 1862. 



