Empididae. 



161 



according to the direction of the view. The dorsocentral and acrostichal 



bristles of some length, black, the former irregularly biserial, long be- 



hind, the latter quadriserial. Further a humeral bristle, a posthumeral, 



two strong notopleural, a supraalar and a postalar bristle, all black 



and rather long; but besides there are other hairs on the sides of the 



disc, especially some strong, bristly hairs in the anterior part of the 



præsutural depression. Pleura dark grey pruinose. 



Scutellum with six, sometimes eight black marginal 



bristles. Abdomen greyish black, somewhat shining, 



with the light from behind it has lighter hind 



margins to the segments and a faint, dark dorsal 



stripe; it is densely clothed with somewhat long, 



black hairs and has long marginal bristles on the 



segments. Venter greyish, short-haired. Exterior 



genitalia small, compressed, with short hairs. Legs 



black, black-haired ; coxæ greyish pruinose; the 



knees slightly yellowish. Front femora with hairs 



on the posterior side; middle femora with long, 



bristly hairs on the anterior side and two rows of 



strong bristles on the apical half below; hind 



femora with fine hairs and with bristles below; 



front tibiæ ciliated above and below, and with 



bristles above; middle tibiæ with bristles on the 



various sides, and hind tibiæ with somewhat long 



bristles on the dorsal and anterior side. Front 



metatarsi slightly thickened, almost not thicker than 



the end of tibiæ, cylindrical, about three fourths of 



the tibiæ in length and a little shorter than the 



other four joints together; they are long-haired ^^^-^^^^^j^^^^'^^j'^'^"' 



above and with some longer, bristly hairs; all ^' 



tarsal joints longer than broad. Wings almost hyaline. Veins black or 



dark brown ; the upper branch of the cubital vein somewhat diverging, 



not curved at the apex. Stigma brown. Halteres brownish black. 



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

 length as in this. Front metatarsi simple, half as long as tibiæ, and 

 about as long as the two following joints; hind tibiæ slightly compres- 

 sed in the apical part, and very slightly curved. Wings brown tinged. 



Length 4,5 to fuUy 6 mm. 



H. interstincta is rather common in Denmark; Ordrup Mose, Bølle- 

 mosen, Lyngby Mose, Birkerød, Tisvilde, Nyraad at Vordingborg; in 

 Jutland at Hald near Viborg; my dates are in June and to ^h. I have 

 always. taken it in or near woods, often flying over ditches, even over 



11 



