104 Orthorrhapha brachycera. 



but there are also some other hairs at the sides. Scutellum with four 

 yellow marginal bristles, the outer weak. Pleura grey, metapleura 

 with long, yellow, bristly hairs; propleura with some inconspicuous 

 hairs. Abdomen and venter grey, clothed with longish, erect, whitish 

 or pale yellowish hairs which are longest in front, Exterior genitalia 

 somewhat large; the eighth ventral segment large, arched, the eighth 

 dorsal segment likewise large, and, as it seems, somewhat unsymetri- 

 cal; the lamellæ of complicated shape, a pair of styliform and a 

 pair of broader, hairy processes are seen, but otherwise the structure 

 is not to be observed without dissection. The penis is seen below as 

 a thin thread, issuing from the arched ventral plate; this latter has 

 long hairs at the margin. Legs black or brownish, coxæ greyish 

 pruinose; hind legs elongated; front metatarsi slightly thickened, hind 

 metatarsi hkewise but to a still slighter degree; hind tibiæ somewhat 

 thickened towards the apex. Front femora with longish hairs above 

 towards the apex, posterior femora with long, bristly hairs below, 

 they are dispersed and between them are shorter hairs; the hind 

 femora have also long hairs on the anterior and posterior side; the 

 front tibiæ have long hairs on the dorsal side, a short, dense pubes- 

 cence below and somewhat longer pubescence on the posterior side; 

 middle tibiæ have shorter hairs and long bristles on various sides, 

 hind tibiæ likewise and especially long bristles dorsally; the tarsi are 

 slightly spinulous beneath; the hind metatarsi have some bristles on 

 the dorsal side, the middle metatarsi have a long bristle near the 

 base and a similar at the apex. The hairs and bristles are more or 

 less dark brown, those below the femora whitish. The ordinary short 

 pubescence of the legs inconspicuous. Wings hyaline; costa and 

 anterior veins brown, the other veins more or less pale yellow; the 

 upper branch of the discai vein abbreviated, the anal vein reaching 

 the margin; the upper branch of the cubital vein about rectangular 

 to the lower. Stigma yellowish. Halteres yellow. 



Female. Frons broad, grey. Abdomen short-haired. Hind legs 

 compressed, hind femora pennate with somewhat short, scaly hairs 

 above in the whole length, and below in the apical half; otherwise 

 the legs short-haired. 



Length 3,5 — 3,8 mm. 



E. hyalipennis is but little known as Danish, it has only been 

 taken in Ordrup Mose on the flowers of Carduus on two occasions, 

 on ^/s 1841 and ^^/s 1845 (Stæger), but it was present in somewhat 

 great numbers; no doubt it will be found again. 



Geographical distribution: — Europe down into Italy; towards 

 the north to middle Sweden. 



