Empididae. 127 



posterior femora pennate on both sides with rather long scaly hairs; 

 on the ventral side of the middle femora the scaly hairs are present 

 only on the apical half, the basal half has only ordinary hairs, and 

 on the hind femora the ventral base has likewise only ordinary hairs; 

 the middle tibiæ are only pennate above and the scaly hairs are 

 short and adpressed; hind tibiæ pennate on both sides, but on the 

 ventral side only on the basal half, on the dorsal side there are some 

 bristles posteriorly to the row of scaly hairs. Wings distinctly brownish, 

 especially towards the base. 



Length 3 — 3,5 mm. 



E. aestiva is common in DenmaTk; Copenhagen in a garden, 

 Ordrup Mose, Dyrehaven, Ørholm, Søllerød, Hillerød, Frerslev Hegn, 

 Frederikssund; on Funen at Middelfart; on Langeland at Lohals and 

 in Jutland in Højenbæk Dal at Vejle, in Vejle Nørreskov, at Laven 

 near Silkeborg, Hald near Viborg, Gjerlev near Randers Fjord and at 

 Aalborg; my dates are ^"/e — ^/s. It occurs generally on open piaces 

 in woods, often sitting on the flowers of Composites, and I have 

 taken it in great number swarming on Carduus. 



Geographical distribution: — Northern and middle Europe down 

 into Thuringia; towards the north to middle Scandinavia. 



Remarks: Zetterstedt mentions under his volucris a male from 

 Denmark, teste Stæger; Loew has already (1. c. 56) declared, that this 

 must be aestiva according to a specimen sent to him from Stæger. 

 The species in the collection in our museum labelled volucris, and of 

 which all specimens are from Stæger, proved also to be aestiva; 

 moreover I have seen a specimen determined as volucris from Zetter- 

 stedt's collection, labelled Stæger, and it was aestiva like the other 

 specimens in the collection determined as volucris, as mentioned above 

 under prodromus. 



23. E. cinerea Zett. 

 1855. Zett. Dipt. Scand. XII, 4609, 7— 8. — Kat. palåarkt. Dlpt. II, 235. 



Female. Frons broad, dark grey, epistoma of the same colour. 

 Occiput grey, with black, below with pale hairs. Labrum twice as 

 long as the head is high; palpi black, with longish hairs at the apex. 

 Antennæ as long as the head, black, the first joint slightly longer 

 than the second, the third broad at the base, attenuated towards the 

 apex; the two first joints with short hairs. Thorax grey, the two 

 interstitia generally presenting themselves as slightly darker stripes. 

 The dorsocentral and acrostichal bristles not short, biserial, black, the 

 former somewhat longer and stronger and uniserial behind. Further 

 a humeral bristle, a posthumeral, about three notopleural, a supraalar 



