124 Orthorrhapha brachycera. 



21. E. caudatula Loew. 

 1867. Loew, Berl. ent. Zeitschr. XI, 33 et 53, 6. — 1903. Kat. palåarkt. 

 Dipt. II, 234. — Empis morosa (non Meig.) : 1862. Schin. F. A. I, 109. 



Male. Eyes contiguous, epistoma blackish. Occiput dark grey, 

 with black hairs. Labrum a little longer than the head is high; palpi 

 black. Antennæ shorter than the head, black. Thorax black, sorne- 

 what shining, a little greyish pruinose and with a slight indication of 

 three darker stripes. The dorsocentral and acrostichal bristles short, 

 biserial, black, the former longer and uniserial behind. Further a 

 humeral bristle, a posthumeral, about three notopleural, a supraalar 

 and a postalar bristle, all black, but besides there are short or longer 

 hairs on the humeri, the sides of the disc and in the præsutural de- 

 pression; especially there are some stronger ones inwards to the 

 humeri and at the transverse furrow. Scutellum with four black 

 marginal bristles. Pleura somewhat greyish pruinose, metapleural 

 hairs black. Abdomen black, slightly shining, clothed with some- 

 what longish, black hairs, generally brownish at the sides in front; 

 venter similarly coloured and haired. Exterior genitalia small, con- 

 structed quite as in prodromus, the upper lamellæ seem likewise to 

 be two-branched. Penis is generally quite hidden. Legs black; coxæ 

 slightly pruinose; front and hind metatarsi somewhat thickened. Front 

 femora short-haired ; middle femora with two rows of bristly hairs 

 ventrally; hind femora short-haired above and below, on the latter 

 side with a couple of bristly hairs towards the apex and further with 

 fine hairs on the posterior side, which are long towards the base, 

 and with some bristles towards the apex on the anterior side; front 

 tibiæ with fine hairs above; middle tibiæ with two rows of bristly 

 hairs below, and with about five long bristles above; hind tibiæ short- 

 haired on both sides and with some bristles above; tarsi slightly 

 spinulous beneath, the front and hind metatarsi with longer hairs 

 above, which are longest and bristly on the hind metatarsi; at the 

 apex of the tarsal joints short bristles are found. The dense, erect 

 pubescence on the ventral side of the front tibiæ and on the anterior 

 side of the middle tibiæ is present and somewhat distinct, and it is 

 continued out on the tarsi. The hairs and bristles are black or 

 blackish, the short, dense pubescence pale. Wings somewhat milk- 

 white ; the basal half of the costa, the subcostal vein and the basal 

 part of the cubital vein brown, the apical half of the costa and the 

 outer part of the cubital vein black or blackish; the other veins 

 white. Stigma very slightly yellowish. Halteres black. 



Female. Eyes separated, frons grey. The hairs on thorax shorter 

 than in the male; abdomen very short-haired. Posterior legs some- 



