Empididae. 107 



rovv of stronger hairs, those in tlie postero-ventral row long towards 

 the base, besides Ihere are shorter hairs on the anterior side; hind 

 femora with long, fine hairs on the ventral and anterior side and 

 with short hairs above; front tibiæ with fine hairs and some bristles 

 dorsally, a dense, short pubescence ventrally, and a little longer 

 pubescence on the posterior side; middle tibiæ with three long bristles 

 dorsally, and dense, somewhat strong hairs ventrally; hind tibiæ with 

 similar hairs ventrally and some long bristles dorsally and here also 

 with shorter hairs ; tarsi slightly spinulous beneath, especially the hind 

 tarsi, and with bristles at the apex of the joints, one at the apex of 

 the middle metatarsi especially long; hind metatarsi with longish hairs 



Fig. 37. Wing ot E. vitripennis. 



and some bristles above. The hairs and bristles are black or dark 

 brownish. Wings hyaline; veins blackish to brown; the upper branch 

 of the discai vein abbreviated, the anal vein very faint, abbreviated. 

 Stigma distinct, brownish. H alteres blackish. 



Female. Eyes separated , frons grey. The bristles on thorax 

 short; abdomen quite short-haired. The posterior legs compressed, 

 strongly pennate on both sides, the . scaly hairs longest on the hind 

 legs; on the ventral side of the middle tibiæ there are scaly hairs 

 only at the base and on the hind tibiæ on the basal half part. The 

 wings tinged with brown, most strongly towards the base. 



Length 2,8 to about 3,5 mm. 



Remarks: Loew says, that the front metatarsi are quite simple, 

 and they may also be termed so, but in comparison with the middle 

 metatarsi they are quite slightly thickened. 



E. vitripennis seems not to be rare in Denmark, but it has not 

 been taken many times and only on few localities; Ruderhegn, Geel 

 Skov (the author); in Jutland in Greisdalen at Vejle (the author), at 

 Rye near Silkeborg, Frijsenborg near Aarhus and Hald near Viborg 

 (H. J. Hansen). My dates are -'Is—^'^h. In 1907 and 1909 I took it 

 in great numbers in Geel Skov on ^h—'^^'b; they were flying quite 

 low on piaces with Galluna between spruce firs. According to the 

 dates the species is an autumn species. 



