J4 Orthorrhapha brachycera. 



but they are always visible. The thoraeic disc has somewhat long, 

 yellow hairs, forming indistinct acrostichal and dorsocentral rows, 

 but also the sides of the disc have numerous hairs; the hairs are 

 longest behind, and the hindmost hair in the dorsocentral rov^s is 

 long and somewhat strong. The notopleural and postalar bristles 

 yeliow. Scutellum brownish grey pubescent with yellow marginal 

 bristles. Pleura greyish pruinose. Abdomen black, rather shining, 

 clothed with pale yellow hairs w^hich are long on the sides but short 

 along the middle; venter more sparingly clothed with medium-long 

 hairs. The genitalia somewhat swoUen. Legs with the hind femora 

 thickened, the ventral side is straight but the dorsal side curved the 

 femora thus thickest in the middle; the hind tibiæ slightly curved. 

 The anterior legs are reddish, the last tarsal joints brownish and the 

 femora generally more or less darkened along the dorsal side; the 

 hind legs black except the reddish tarsi ; the anterior coxæ reddish 

 towards the apex, for the rest blackish, greyish pruinose. The coxæ 

 have long, whitish yellow hairs; the anterior femora are long haired, 

 especially along the ventral side; the anterior tibiæ have rows of very 

 long hairs directed to the various sides except the dorsal, and similar 

 hairs are present on the first tarsal joint; on the other tarsal joints 

 the hairs are shorter; the middle tibiæ have some strong bristles 

 on the dorsal side and a pair of strong apical bristles. The hind 

 femora have three rows of spines on the ventral side and some strong 

 bristles apically on the antero-dorsal side; otherwise the hind legs 

 are densely clothed with long hairs ; a separate short, dense pubescence 

 is present on the ventral side of the front tibiæ, apically on the 

 posterior and ventral side of the hind tibiæ and beneath the hind 

 tarsi; the hind metatarsi have some short, black spines beneath, and 

 generally also a pair is found on the following joint. All the spines 

 are black, the strong bristles on the middle tibiæ brownish black;. the 

 hairs are all pale yellow. The wings may vary from quite hyaline 

 to somewhat strongly blackish brown tinged, the very base is always 

 clear. The veins may vary from brownish black and thick to rather 

 pale and thin; generally they are thin in the hyaline wings but some- 

 times however rather thick. Stigma very slightly conspicuous both in 

 the hyaline and the tinged wings. Halteres white to very slightly 

 yellowish. 



Female. The anterior legs short haired and the hind femora 

 only slightly thickened. 



Length 3,7 — 5 mm. 



The two hitherto generally admitted species femoratus Miill. and 

 fumipennis Meig. are evidently one; all transitions with regard to the 



