176 



abdomen nearly equal in length. Tibise and tarsi brown, base of the tarsi 

 testaceous ; hind tarsi longer than in B. equinus. Male. Glossy-black. 

 Var. Posterior tibia3 and middle tarsi entirely testaceous. 

 Not common. (E.) 



6. flavipennis, Hal. E. M. iii. 324. 6 (1836). Fcem. Niger, 

 facie coxis anticis et genubus testaceis, alis Jlavescentibus pallido-venosis, 

 halter ibus albidis. Long. 1^; alar. ^JJ lin. 



Black. Frontalia dull ; triangle glossy. Face and palpi testaceous. 

 Thorax shining. fPings yellowish ; veins scarcely darker ; praebrachial 

 transverse vein placed at about the first third of the discal areolet. 

 Halteres whitish. Abdomen dull-black; second segment not longer 

 than the third. Legs hairy ; fore coxae and the extreme base of the 

 tibias rust-yellow. Resembles B. longipennis, but the transverse veins 

 are much less distant, the fore and hind femora are thick, the hind 

 metatarsus is almost triangular, the second very little longer. 



Not common. (E.) 



7. longipennis, Hal. E. M. iii. 324. 7 (1836). Niger, alis pal- 

 lido-venosis, venis transversis remotis, halteribus albidis, pedibus ferru- 

 gineis, femoribus et tibiarum apicefuscis. Long. H; alar. 3 lin. 



Black, pubescent, with little gloss. Frontalia opaque. Things hya- 

 line with pale veins ; prcebrachial transverse vein usually at the first fifth 

 of the discal areolet. Halteres whitish. Segments of the abdomen 

 nearly equal ; underside and sometimes the incisures pale. Legs hairy ; 

 second joint of the hind tarsi a little thickened, one-half longer than 

 the first ; the spur springs before the extremity of the hind tibia3, and 

 is very slender and long. Male. Extremity of the abdomen hairy, but 

 little thickened. Legs pitchy-brown ; fore coxae, knees, and base of the 

 tibia rust-brown; fore metatarsus very distinctly unguiculate. Fern. 

 Legs rust-brown or rust-yellow ; fore and hind tarsi, end of the tidies and 

 of the posterior femora brown. 



Common. (E. I.) 



8. vitripennis, Meig. Zw. vi. 206. 20 (1833); Hal.; Zett. 

 Niger, alis hyalinis fusco-venosis, venis transversis remotis, halteribus 

 albidis. Long. 1 ; alar. 2-^ lin. 



Resembles B. longipennis in most characters. Entirely black. Fron- 

 talia very deep black, opaque. Triangle and thorax shining. Wing- 

 veins more apparent; transverse veins scarcely so remote. Base of 

 the halteres blackish. Abdomen of the male clavate and less hairy at 

 the tip. Legs entirely black. Far. Legs less hairy and much longer ; 

 second joint of the hind tarsi not thickened. 



Not common. Inhabits the sea-coast. (E. I.) 



9. ater, Meig. Zw. vi. 203. 11 (1830) ; ^A.geniculatus, Mcq. ; 

 Zett. Niger, nitidus,glaber,fronte antice et genubus testaceis, halteribus 

 albidis. Long. 1 ; alar. 3 lin. 



