Empididae. 321 



middle femora blackish. Wings hyaline. Veins brownish or pale 

 brown. Halteres yellow or yellowish white. 



Female. Similar to the male; abdomen pointed. 



Length 2 lo about 3 mm. 



T. longkornis is somewhat rare in Denmark; GPiarlotlenlund, 

 Ermelund, Geel Skov, at Sorø and at Nyraad near Vordingborg; in 

 Jutland at Hald near Viborg; my dates are Vv,—^-'l?i. It occurs like 

 the preceding in woods on bushes and in low herbage on shaded 

 piaces; it is a somewhat late occurring species; I have taken it in 

 copula on -Vo. 



Geographical distribution: — Europe dov^n into Spain and Italy; 

 towards the north to northernmost Scandinavia, and in Finland. 



32. T. albiseta Panz. 



1806. Panz. Faun. germ. CIII, 17. -- 1822. Meig. Syst. Beschr. III, 

 73, 11. — 1842. Zett. Dipt. Scand. 1, 310, 46. — 1903. Kat. palåarkt. 

 Dipt. II, 279. — Tachydromia castanipes: 1822. Meig. Syst. Beschr. III, 

 79, 26. — Platypalptts castanipes: 1862. Schin. F. A. I, 90. 



Male. Vertex and frons grey, the latter narrow; epistoma ex- 

 ceedingly narrow, the eyes here almost touching; palpi small, whitish. 

 Occiput greyish black, with two black bristles above, and short, yel- 

 lov^ish hairs below. Antennæ black, long, the third joint elongated; 

 the arista white, longer than the rest of the antennæ. Thorax black, 

 shining, with a narrow, well defined, grey pruinose margin; the 

 uniserial dorsocentral and biserial acrostichal hairs black, very short 

 and scarcely observable ; there is no long dorsocentral bristle behind, 

 but there is one black notopleural bristle. Scutellum with two black 

 marginal bristles, Pleura black, shining, the propleura, a stripe along 

 the lower margin of the mesopleura and the pteropleura and hypo- 

 pleura whitish grey pruinose. Abdomen black, shining, with short, 

 yellowish hairs. Venter black. The exterior genitalia small, some- 

 what greyish pruinose, with some slender hooks at the apex. Legs 

 slender, yellow, the front femora above and all tibiæ more or less 

 brownish; the tarsi darker brown. The anterior femora almost not, 

 the middle femora a little thickened; no spine at the apex of the 

 middle tibiæ. The legs are pale brownish haired, the bristles on the 

 postero-ventral side of the middle femora long, black; the hind femora 

 with longlsh hairs below. Wings more or less greyish or brownish 

 tinged. Veins brown or blackish, the cubital and discai vein con- 

 verging, the lower branch of the postical vein much recurrent, parallel 

 with the wing-margin. Halteres pale yellowish. 



Female. Similar to the male; abdomen pointed. 



-21 



