Empididae. 219 



fluent. No acrostichal bristles, and no small bristles in the dorso- 

 central rovvs. Scutellimi with two bristles. Front femora with stronger 

 or small bristles below. 



Tahle of Species. 



1. Radial vein straight; only the cross-veins and the base of 

 the cubital fork seamed, the wing thus with three spots; 

 front femora with very small bristles 2. stagnalis. 



— Radial vein undulated; besides the cross-veins and the base 

 of the cubital fork also the base of the upper branch of 

 the postical vein seamed, and moreover a spot on the 

 upper branch of the discai vein, the wing thus with five 



spots ; front femora with strong bristles at the base 3. Wesmaelii. 



2. Cl. stagnalis Hal. 



1833. Hal. Entom. Mag. I, 159. — 1838. Meig. Syst. Reschr. VII, 93, 

 13 (Hemerodromia). — 1858. Loew, Wien. entom. Monatschr. Il, 246, 4. 



— 1862. Schin. F. A. I, 84. — 1887. IVlik. Verh. zool. hot. Geseli. Wien, 

 XXXI, 326, Tab. XVI, Fig. 6-7. — 1903. Kat. palaarkt. Dipt. II, 264. — 

 Brachtjstoma Westermanni: 1838. Zett, Ins. Lapp. 558, 1. — 1842. Zett. 

 Dipt. Scand. I, 360, 1. 



Male. Frons and vertex olive-brown; epistoma silvery white; 

 palpi brownish black. Occiput grey, with black, bristly hairs above, 

 fme, whitish hairs below. Antennæ black. Thorax olive-brown, with 

 two dark brown median stripes, abbreviated behind. On the disc 

 there are five long, black dorsocentral bristles, but no acrostichal 

 bristles. Further a humeral bristle, a posthumeral, two notopleural, 

 a supraalar and a postalar bristle, all somewhat long, black. Scutel- 

 lum with two black marginal bristles. Pleura slate-grey or almost 

 bluish grey, metapleura with fme, yellowish white hairs. Abdomen 

 likewise slate-grey, with a broad, olive-brown, longitudinal dorsal 

 stripe; it is sparingly clothed with short, pale yellowish hairs, which 

 are a little longer at the margin of the fii-st dorsal segment. Venter 

 slate-grey, the hind margin of the segments paler. Exterior genitalia 

 moderately large, both pairs of lamellæ somewhat blade-like, generally 

 directed forwards and closed; the outer (lower) lamellæ grey, the 

 inner (upper) longer, black, shining. Penis blackish, thin, curved at 

 the end. Legs dark brown; coxæ, and partly also the femora, grey, 

 the apical part of the femora reddish. The legs short-haired with 

 brownish hairs; hind tibiæ with a little longer hairs ventrally on the 

 apical half part; the front femora with a row of a little longer hairs 

 below, which are stronger, bristle-like and black towards the apex. 

 Wings hyaline or slightly greyish tinged. Veins dark brown or blackish; 

 the media] cross-vein, the base of the cubital fork and the cross-veins 



