140 Orthorrhapha brachycera. 



the apex; the outer lamellæ small, roundish rectangular, whitish with 

 a narrow, blackish margin along the ventral, apical and outer half of 

 the dorsal edge; the end has about three teeth with black, curved 

 hairs, and dorsally to them a curved hair; the ventral margin is 

 slightly serrated, with few hairs, and on the inside inwards curved 

 hairs. Legs pale yellow, front coxæ whitish pruinose anteriorly; 

 posterior coxæ grey with pale yellow apex, the hind coxæ also pale 

 on the posterior side and with the apex more broadly pale; anterior 

 tarsi with apex of metatarsus and the four folio wing joints black; 

 hind tibiæ a little thickened towards the apex with about the apical 

 third black, hind tarsi black. The legs have short, black hairs, front 

 coxæ a little white-haired outwards; hind femora inconspicuously 

 pale-haired below; posterior femora with one preapical bristle; front 

 tibiæ with bristles above, and two on the postero-ventral side; middle 

 tibiæ with three or four antero-dorsal bristles (one of them more 

 dorsal), two postero-dorsal, and with one ventral bristle below the 

 middle; hind tibiæ with two dorsal rows of bristles, one ventral 

 bristle towards the apex, and a ventral row of small, somewhat 

 densely placed bristles; hind metatarsi with only one dorsal bristle, 

 and only small anterior and ventral bristles. The bristles on the legs 

 are somewhat long. Wings almost hyaline or very slightly tinged; 

 veins blackish, costa with a thin, but elongated swelling; discai vein 

 with a small, obtuse bend; axillary lobe not large, anal vein directed 

 somewhat forwards. Squamulæ pale yellow, with a black fringe. 

 Halteres yellowish white. 



Female. Epistoma broad, greyish white or a little yellowish. An- 

 tennæ shorter than in the male, third joint shorter and more pointed. 

 Wings somewhat tinged, costa without swelling. 



Length 3,3 — 3,8 mm. 



This species is, in spite of its resemblance to several other species, 

 easily recognised by the single dorsal bristle on the hind metatarsi. 



D. agilis is rare in Denmark, and most specimens are taken in 

 recent time; it was not known to Stæger, yet three specimens were 

 present in our old collection, placed under the species labelled as 

 agilis, which is identical with Unearis, and also under trivialis; other- 

 wise only six specimens have been caught; Vedbæk, Tisvilde (the 

 author); on Fanen (H. J. Hansen); in Jutland at Hald near Viborg 

 (the author), and at Frederikshavn, and finally on Bornholm at Hasle 

 (H. J. Hansen). 



Geographical distribution:- — Northern and middle Europe down 

 into Austria and Styria; it seems to have its northern limit in Den- 

 mark; in Kat. palåarkt. Dipt. Zetterstedt is quoted, but according to 



