Empididae. 109 



— Wings in the male hyaline, slightly milky; middle 

 femora with the bristles below tuft-like crowded at the 



base; front metatarsi in the female not pennate 16. vernalis. 



7. Abdomen clothed with whitish or yellowish hairs 8. 



— Abdomen clothed with more or less blackish hairs 10. 



8. Metapleural bristles whitish or yellow 9. 



— Metapleural bristles black 19. prodromus. 



9. Abdomen white-haired; metapleural bristles whitish; 



size 3,2 — 3,8 mm 18. chioptera. 



— Abdomen yellow-haired ; metapleural bristles yellow; 



size 5 — 5,7 mm 20. serotina. 



10. Anal vein reaching the margin 21. caudatula. 



— Anal vein abbreviated, not reaching the margin 22. aestiva. 



13. E. pennipes L. 



1761. Linn. Fn. Suec. 1896. — 1805. Fabr. Syst. Antl. 138, 6. — 

 1822. Meig. Syst. Beschr. III, 21, 8. - 1842. Zett. Dipt. Scand. I, 380, 14 

 et 1859. XIII, 5008, 14. — 1862. Schin. F. A. I, 107. - 1903. Kat. 

 palåarkt. Dipt. II, 242. — Empis ciliata (non Fabr.): 1804. Meig. Klass. 

 eur. zweifl. Ins. I, 220, 3. — 1815. Fall. Dipt. Suec. Empid. 20, 8. 



Male. Eyes contiguous; epistoma blackish. Occiput greyish black, 

 with black, below more brownish hairs. Labruin very long, only 

 somewhat shorter than the whole body, black; palpi black or brownish. 

 Antennæ black, about as long as the head, the two basal joints with 

 a few short hairs. Thorax black, shining, somewhat greyish brown 

 pruinose, especially when seen from in front. The dorsocentral bristles 

 somewhat long, biserial, the hinder of them longer, strong and uni- 

 serial, acrostichal bristles a little shorter, biserial; all black. Further 

 a hmiieral bristle, a posthiimeral, about two notopleural, a supraalar 

 and a postalar bristle, all black, but they are not very conspicuous 

 among the other hairs present at the sides 

 of the thoracic disc. Scutellum with two 

 strong, black marginal bristles, and at each 

 side a small one. Pleura dark greyish 

 pruinose, metapleura with black bristles. 

 Abdomen black, somewhat shining, venter 

 sometimes a little paler, and dull greyish. 

 Abdomen is clothed with erect, blackish or 

 brown hairs which are longest at the sides ^is. 38. E. pennipes, 



and especially in front; venter with shorter male genitalia. 



hairs. Exterior genitalia somewhat large, 



the lower lamellæ are directed more or less straightly backwards, they 

 are rather long and somewhat triangular with a shallow excision in 

 the upper margin, and they are therefore pointed; the upper lamellæ 



