Empididae. 255 



front femora there is a bristle on the anterior and posterior side, on 

 the middle femora a specially strong bristle on the anterior side ; the 

 hind tibiæ have fine, slightly longish hairs above and below, and all 

 tibiæ have apical spurs. The hairs are paler or darker brownish, the 

 bristles blackish. Wings hyaline, Veins blackish brown; the cross- 

 veins near to each other; the discai vein thin from somewhat after 



Fig. 113. Wing of D.aterrima, the mediastinal vein not seen. 



the base to a little beyond the postical cross-vein, the last part of 

 the vein is slightly undulated. Balteres brownish yellow to brownish. 



Female. Quite similar to the male, only the abdomen pointed. 



Length 1,6 — 2 mm. 



I have determined this species by comparison with specimens of 

 aterrima sent to me from Mr. Verrall, but in reading Loew's descrip- 

 tion of his nervosa, which according to the Kat. palåarkt. Dipt. is 

 identical with nigritella Zett., I find no distinguishing character, e. g. 

 the absence of the bristles on the anterior part of the thoracic disc, 

 the bristles on the legs and the venation of the wings are quite in 

 accordance; I have therefore no doubt, that aterrima Curt. and nigri- 

 tella Zett. = nervosa Loew are identical. 



D. aterrima is somewhat rare in Denmark, but has however been 

 taken on several localities; at Copenhagen (Schlick), Rørvig (the 

 author); on Møen at Maglevandsfaldet (J. C. Nielsen); on Langeland 

 at Lohals (the author) and in Jutland at Nymindegab (Th. Mortensen). 

 The dates are 2V2— ^^/t; on the former date it was taken with the 

 sieve in flood refuse at Copenhagen, it was present in rather great 

 numbers, and it would thus seem as if it hibernates as imago. 



Geographical distribution:— Northern and middle Europe down 

 into Germany; towards the north to southern Sweden. 



2. D. setigera Loew. 



1859. Loew, Neue Beitr. zur Kenntn. d. Dipt. VI, 39, 6. — 1862. 

 Schin. F. A. I, 96. — 1903. Kat. palåarkt Dipt. Il, 274. 



Male. Frons, vertex and epistoma black; ocellar tubercle with 

 two bristles. Palpi grey. Occiput black, grey downwards along the 



