Empididae. 



137 



E. nigricans is not common in Denmark and has only been 

 taken a few times; Ordrup Mose, Ermelund, and on Funen; my dates 

 are ^h — ^/s. Zetterstedt records it as frequenting the flowers of 

 Carduus. 



Geographical distribution: — Nortiiern and middle Europe down 

 into France; towards the north to middle Sweden. 



28. E. borealis L. 



1761. Linn. Fn. Suec. 1899. — 1822. Meig. Syst. Beschr. III, 36, 

 37. — 1842. Zelt. Dipt. Scand. I, 370, 2. — 1862. Schin. F. A. I, 105. — 

 1903. Kat. palaarkt. Dipt. II, 334. 



Male. Eyes contiguous; frontal triangle and epistoma brownish 

 grev. Occiput grey, with long, black, downwards brownish hairs. 

 Labrum not, or scarcely twice as long as the head is high; palpi 

 blackish, with long, black hairs. Antennæ long, longer than the head, 

 black, first joint twice as long as the second, the third elongated, 

 very slightly attenuated towards the apex; the style short; the two 

 first joints with longish, black hairs. Thorax dark greyish brown, 

 with four blackish brown stripes, the two median abbreviated behind, 

 the two lateral generally less distinct and abbreviated at both ends. 

 The dorsocentral hairs pluriserial, the acrostichal biserial, all long and 

 fine, black; the dorsocentral hairs strong and a little longer behind; 

 the sides of the disc with similar hairs, fused with the dorsocentral 

 hairs. There are three or four notopleural bristles, a supraalar and 

 a strenger and a weaker postalar bristle, 

 all black, but there are no humeral or 

 posthumeral bristles discernible between 

 the long hairs. Scutellum has six black 

 marginal bristles. Pleura grey, meta- 

 pleura with black bristles; propleura 

 with black hairs. Abdomen greyish 

 brown, slightly shining, clothed above 

 with short, at the sides with long, erect, 

 black hairs, which are slightly stronger 

 at the hind margins of the segments. 

 Venter similarly coloured, with long, 

 black hairs. Exterior genitalia large, 

 and the apex of abdomen curiously 

 shaped; the sixth dorsal segment arched Fig. 45. £. »oreftZis, male genitalia. 

 and bending rectangularly down, the 



seventh segment a very narrow ring, the eighth somewhat broader; 

 the lower lamellæ of a somewhat rectangular shape, the upper lamellæ 



