Dolichopodidae. 251 



streamlet, which in the summer was almost quite dried up; the imago 

 escaped on ^/8. 



Of the genus two palæarctic species are known; one occurs in 

 Denmark. 



1. L. vestita Wied. 



1817. Wied. Zool. Mag. 1, 75, 24 {Dolkhopus) . — 1824. Meig. Syst. 

 Beschr. IV, 48, 5 {Porphyrops) , et 1838. VII, 154, 5 {Argyra). — 1843. 

 Zett. Dipt. Scand. II, 595, 83, et 1859. XIII, 5063, 83 [Dolkhopus). — 

 1862. Schin. F. A. I, 189 {Argyra). — 1878. Kow. Verhandl. zool. bot. 

 Geseli. Wien, XXVIII. 458, 1, Taf. V, Fig. 26. — 1903. Kat. palåarkt. Dipt. 

 II, 325. 



Male. Vertex and frons greyish white; eyes with light brownish 

 hairs. Epistoma somewhat narrow, silvery white, seen quite from below 

 dark greyish. Palpi small, black. Occiput green, greyish pruinose; 

 postocular bristles black above, yellowish below. Antennæ black. 



Fig. 80. Antenna of L. vestita d", from the inside. X 90. 



considerably longer than the head, the third joint much longer than 

 the two basal ; arista a little shorter than the antennæ. Thorax 

 metallic green, slightly whitish or bluish white pruinose, shining; 

 scutellum without hairs above. Pleura greenish, grey pruinose ; pro- 

 thoracic bristles small, brownish or yellow. Abdomen with the ground 

 colour appearing greyish, seen from behind with a very faint greenish 

 hue; the first segment greenish, the rest densely silvery pruinose, the 

 sixth blackish grey; abdomen clothed with short, black hairs, some- 

 what longer at the sides, and it has hindmarginal bristles, long on 

 the first segment; the eighth segment has a couple of long bristles. 

 Venter dark grey, with blackish hairs and hindmarginal bristles. Hypo- 

 pygium small, outer lamellæ and ventral lobes likewise small. Legs 

 with the coxæ grey, front coxæ more or less yellow at the apex; 

 femora yellow, or generally the anterior femora more or less blackish 

 or brown from the base to near the apex, most on the middle femora; 

 hind femora brownish or black at the apex or sometimes almost 



