Empididae. 157 



at the hind margin of the segments. Venter grey, short-haired. Exterior 

 genitalia somewhat large, compressed ; the lamellæ somewhat long- 

 pointed. Legs black; coxæ greyish pruinose. Front femora with fine 

 hairs above and below, and on the posterior side ; middle 

 femora with bristles on the anterior side; hind femora 

 with fine hairs, and with bristly hairs on the antero- 

 ventral side, which latter are long towards the apex; front 

 tibiæ with fine hairs and some longer, bristly hairs above, 

 longest at the apex; middle tibiæ with bristles on the 

 various sides; hind tibiæ ciliated and with bristles on the 

 dorsal and anterior side. Front metatarsi thickened, some- 

 what thicker than tibiæ; they are short-haired, longest 

 above, and a little longer towards the apex, below they 

 have some distantly placed, longer, very fine hairs; they 

 are about three fourths of the tibiæ in length and nearly 

 as long as the four following joints, which are longer than 

 broad; the whole tarsus is longer than tibiæ. The hairs Fig.55.JZ. ni- 

 and bristles black or blackish. Wings somewhat blackish ^''^^^^^t fi'ont 

 tinged. Veins blackish; the upper branch of the cubital ^' 

 vein not much diverging; anal vein continued to the margin. Stigma 

 blackish brown. Halteres black. 



Female. Similar to the male; the thoracic bristles about of the 

 same length or slightly shorter. Front metatarsi simple, scarcely half 

 as long as the tibiæ and as long as the three following joints; hind 

 tibiæ with the basal third part thin, then strongly dilated, compressed 

 and curved, and again a little narrowed towards the apex. 



Length 3,5 towards 4 mm. 



This species resembles quadrifaria, but it has a blacker and 

 a little more shining thorax, longer thoracic bristles and darker wings 

 with a complets anal vein; the female is easily known by the shape 

 of tiie hind tibiæ. 



H. nigrina seems not to be common in Denmark; Ordrup Mose 

 (Stæger), and in Jutland at Hald near Viborg (the author); the dates 

 are ^^/e — ^'^/s. f took my specimens towards the evening flying low 

 over a rapidly flowing brook. — Immature specimens may have the 

 legs hght brown, and the wings rather slightly tinged. 



Geographical distribution: — Europe down into Italy; towards 

 the north to southern Sweden, and in Finland. 



9. H. bivittata Strobl. 



1892. Strobl, Verh. zool. bot. Gesell. Wien, XLII, 113, 7. — 1903. 

 Kat. palåarkt. Dipt. II, 249. 



