68 Orthorrhapha brachycera. 



yellowish white hairs. Frons and vertex brownish pruinose, black haired. 

 Occiput whitish grey pruinose, occipito-orbital bristles black, the hairs 

 whitish both above and below. Antennæ blackish brown, the hairs 

 on the two first joints black, those on the under side of the first joint 

 long. Thorax greyish brown, more ash-grey behind : the middle stripe 

 blackish brown, narrowed behind and pointed, divided in the whole 

 length by a narrow, more or less distinct line; the side stripes less 

 dark than the middle stripe ; a short humeral stripe present. The disc 

 clothed with somewhat longish, erect, black hairs which are longer 

 behind; the bristles on the sides generally pale, those in the middle 

 black. Scutellum with whitish hairs and marginal bristles. Pleura greyish 

 pruinose with long, yellowish hairs; the long hairs on meta- and hypo- 

 pleura whitish. Abdomen yellowish or grey with a generally indistinct 

 darker brown dorsal line; with the light from behind it is blackish, 

 somewhat shining, with the hind margins of the segments grey. Venter 

 grey. Abdomen clothed with yellowish hairs which are long at the 

 sides of the first segments; sometimes the hairs along the middle are 

 black; at the hind margins of the segments there are yellow bristles 

 which are longest towards the sides. Venter with long, whitish hairs. 

 Genitalia black, generally black haired but often yellowish haired at the 

 apex and below ; the arms of the upper forceps wMth nearly parallel 

 edges, curved slightly downwards towards the apex; the apex truncate 

 with a small excision; the lower forceps shorter than the upper; the 

 ventral lamella black, shining but the hind margin broadly greyish so 

 that the black colour is often not to be seen. Legs with the femora 

 black, tibiæ ferrugineous with the tips black, tarsi black, metatarsus 

 more or less ferrugineous and generally also the base of the following 

 joints of the same colour. Goxæ greyish pruinose with long whitish 

 hairs ; the hairs on the legs chiefly yellowish on the femora and partly 

 also on the anterior tibiæ, black on the dorsal side of the front tibiæ 

 and the anterior side of the middle tibiæ, on the hind tibiæ and on 

 all tarsi; long and thin, pale hairs are found on all sides of the 

 anterior femora except the front side and on the ventral and posterior 

 sides of the hind femora; they are longest below the front femora; 

 moreover they are found on the ventral and posterior sides of the 

 anterior tibiæ; strong spine-like bristles are found on the front side 

 of the middle femora and on the front and ventral sides of the hind 

 femora, then on the dorsal side of the anterior tibiæ and on all sides, 

 except the posterior, of the hind tibiæ; as usually some few are found 

 apically on the dorsal side of the posterior femora; there are no 

 spine-like bristles on the ventral side of the front femora; the spine- 

 like bristles are chiefly black with some few pale intermingled ; they 



