Empididae. 311 



third antennal joint, and by the legs being much shoiier haired; also 

 the colour of the legs is different. 



T. exigua is not common in Denmark; vicinity of Copenhagen 

 and at Boserup near Roskilde; I know no time for its capture. 



Geographical distribution : — Northern and middle Europe down 

 into Austria and Styria; tovvards the north to southern Sweden, and 

 in Finland. 



21. T. agilis Meig. 



18^22. Meig. Syst. Besclir. III, 80, 29. — 1842. Zett. Dipt. Scand. I, 

 275, 4. — 1862. Schin. F. A. 91 {Platypalpus). — 1903. Kat. palåarkt. 

 Dipt. II, 279. 



Male. Frons and vertex dark grey; epistoma very narrow, white; 

 palpi dark, small, greyish haired. Occiput dark grey, with black 

 bristies and hairs above, white hairs below. Antennæ black, the 

 third joint a little elongated and a little shorter than the arista. 

 Thorax greyish brown pruinose, but not densely and a little shining; 

 there are two long dorsocentral bristles behind, and two noto- 

 pleural bristles; all the bristles and hairs black. Scutellum with 

 four black marginal bristles, the median the longest. Pleura dark 

 greyish pruinose; above the middle coxæ a black, polished spot. 

 Abdomen black shining, the first segments with narrow, grey bands 

 at the sides; it is clothed with short, pale yellow hairs. Venter black. 

 The exterior genitalia somewhat thick. Legs yellow or reddish yellow, 

 the posterior coxæ black; the tarsi black annulated, the last three or 

 four joints so broadly that they are almost or quite black; sometimes 

 the anterior femora somewhat blackish above and the hind femora 

 with a broad black ring. The front femora somewhat, the middle 

 femora considerably thickened. The legs are yellow haired, the front 

 and hind tibiæ with a few small, blackish bristles on the dorsal side, 

 and also the bristles at the apex on the anterior side of the middle 

 femora are black; the hind femora with a row of short, blackish or 

 brown bristles below ; the hairs below the front femora are not long, 

 and the ordinary long hairs on the postero-ventral side of the middle 

 femora not much developed. Wings about hyaline. Veins blackish 

 or dark brown; the postical vein generally disappearing just before 

 the margin; the anal vein very weak, and the lower part of the 

 lower postical branch likewise very weak. Balteres dirty whitish. 



Female. Similar to the male, but the legs generally blacker, 

 often the anterior femora more or less black, and the hind femora 

 quite or almost quite black, and also often the hind tibiæ black; tho 

 hairs below the hind femora not bristlv. 



