Empididae. 39 



hyaline, very slightly yellowish. Veins light brown to yellowish. 

 Stigma faint, yellow. Halteres white with a slight yellow tinge. 



Female. Quite agreeing with the male in shape and colour of 

 the body, but the legs short-haired. Wings broad, and especially 

 very broadened towards the apex, this forming an almost straight 

 line in which the cubital, discai, postical and anal vein terminate; 

 it is thus seen, that it is the part of the posterior margin from the 

 apex of the anal vein to the apex of the cubital vein which is drawn 

 out to form the broad, straight end of the wing; along the posterior 

 and apical margin there is a broad, brown seam. 



Length. About 4 — 4,5 mm. 



Remarks: The specimen described 1. c. by Lefebvre as a male is 

 both by description and figures with certainty a female. 



Rh. platyptera is very rare in Denmark, only five specimens, all 

 females, have been taken; Charlottenlund (Jacobsen), Dyrehaven 

 (Schlick), at Sorø (Schlick) and one specimen without locality pro- 

 bably also from Dyrehaven (Drewsen). Jacobsen caught his specimens 

 in the grass, while Schlick took one of his two specimens sitting on 

 a hedge-stake in the fence of Dyrehaven. The dates known are 



Geographical distribution : — Northern and middle Europe down 

 into France and Switzerland; its northern limit lies in the southern 

 Sweden. 



2. Rh. nigripes Fabr. 



1794. Fabr, Ent. syst. IV, 405, 13 [Empis) et 1805. Syst. Antl. 141, 

 17 {Empis). — 1822. Meig. Syst. Beschr. III, 48,13, Taf. XXIII, Fig. 2. — 

 1842. Zett. Dipt. Scand. I, 389, 1 et 1849. VIII, 3030, 1. — 1862. Schin. 

 F. A. I, 98. — 1903. Kat. palåarkt. Dipt. II, 227. 



Male. Eyes separated, frons narrow, dark grey, with a faint im- 

 pressed middle-line, somewhat widened below; the frons has long, 

 erect, blackish brown hairs. Epistoma grey; occiput grey with black 

 hairs, on the lower half with long, pale yellow hairs. Labrum about 

 as long as the head is high or slightly longer, black, ferruginous at 

 the tip; palpi black with black hairs. Antennæ about as long as the 

 head, black, the two basal joints greyish with black hairs; the fli'.st 

 joint twice as long as the second. Thorax grey with four brownish 

 black stripes, the two lateral broad, somewhat abbreviated in front, 

 the two median narrow, abbreviated behind. The dorsocentral and 

 acrostichal bristles short, black, sometimes brownish in front; the 

 former somewhat pluriserial, the latter biserial; further a humeral 

 bristle, a posthumeral, three notopleural bristles, some supraalar and a 



