Dolichopodidae. 395 



small, the former with distinct bristles above in a Iransverse row. 

 Acrostichal bristles present, short, uniserial; there are six dorsocentral 

 bristles, further a humeral bristle and a couple of weak, a post- 

 humeral, two notopleural, a præsutural, three supraalar and a postalar 

 bristle; the front part of the disc with some small hairs. Propleura, 

 with fine hairs but no bristle. Scutellurn with two marginal bristles 

 and with a small hair on each side, besides with some (4) very small 

 hairs between the bristles. Abdomen a little elongated, compressed; 

 in the male there are six visible dorsal segments, the first shorter 

 than the following; on the ventral side there are, as far as I could 

 see, five segments, the first as usual very small; the abdomen is 

 rounded at the end, the hypopygium quite imbedded, the eighth seg- 

 ment however, and the small, as far as I could detect, united outer 

 lamellæ may be seen. In the female there are five visible abdominal 

 segments. Dot-like impressions are present on some of the segments, 

 but not very distinct. The abdominal segments have short hind- 

 marginal bristles. Legs somewhat slender, hind tarsi short, much 

 shorter than the tibiæ, the metatarsus a little shorter than the second 

 joint, without bristles. Posterior coxæ with a bristle, and posterior 

 femora with a preapical bristle; front tibiæ with a dorsal bristle, 

 middle tibiæ with three antero-dorsal, one postero-dorsal and one 

 ventral bristle; posterior tibiæ besides with apical or preapical bristles. 

 Glaws, pulvilli and empodium small, the latter somewhat comb-shaped, 

 with long bristles below. Wings in the male somewhat narrowed 

 towards the base with the axillary lobe almost wanting, they are 

 broader in the female with the axillary lobe moderate. The mediastinal 

 vein terminating in the subcostal vein ; discai and cubital vein almost 

 parallel; posterior cross-vein a little behind the middle; anal vein 

 quite short. The discai vein has a distinct convexity a little behind 

 the posterior cross-vein. Squamulæ with a small angulary lobe, bearing 

 a long fringe, the inner part of squamulæ with longish hairs. 



The developmental stages are not known. 



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



1. B. bicolorellum Zett. 



1843. Zett. Dipt. Scand. 11, 617, 104 (DoUchopus). — 1862. Schin. 

 F. A. I, 184 (Xanthochlorus). — 1892. Strobl, Wien. ent. Zeitg. XI, 102, 1. — 

 1903. Kat. palåarkt. Dipt. II, 350. 



Male. Vertex and frons green, somewhat pruinose. Eyes touching 

 for a long distance, epistoma only seen above, white. Palpi yellowish 

 brown. Occiput greenish, grey pruinose; postocular bristles whitish, 

 the uppermost are black. Antennæ somewhat elongated, third joint 



