LIANCALUS. 109 



has reference to the unarmed fore feet, by which it is distinguished 

 from the next related genera of Scellus and Hydrophorus. 



1. L-. genitalis Loew. % and J. — Virescens, thoracis lineis quatuor 

 abdominisque fasciis obscuris, pedibus ex nigro viridibus, genibus liavis, 

 alis maris macula apicali nigra, guttam candidam includente, ornatis. 



Greenish, four lines upon the thorax, and the bands upon the abdomen 

 dark, feet blackish-green with yellow knees ; the tip of the wing in the 

 male with a blaok spot, which contains a snow-white drop. Long. corp. 

 0.26—0.28. Long. al. 0.31. 



Stn. Liancalus genitalis Loew, Neue Beitr. VIII, 70, 1. 



Closely related to the European L. virens Scop, and very much 

 like it, though differing from it in the neuration and the picture 

 of the wings, as also by the greater length of the filiform append- 

 ages of the hypopygium. Blue-greenish, somewhat gray from pale 

 dust. Face green or blue with rather whitish dust, which, how- 

 ever does not conceal the grouud-color. The large black palpi, 

 fringed with black and comparatively long hair, when seen from 

 the side, usually appear entirely gray-yellowish on account of the 

 dust, with which they are covered. Front green and somewhat 

 spotted with whitish dust. Antennae entirely black. The cilia 

 of the posterior orbit black above, whitish below. The upper 

 side of the thorax has two narrow, linear longitudinal stripes, 

 separated by a reddish-gray middle line ; these stripes are rather 

 black in fully colored specimens ; there are besides two lateral 

 stripes, the posterior part of which is bifurcated near the trans- 

 verse suture. Thus, not much is left of the beautiful blue-green 

 color, except two broad longitudinal stripes, bearing the stronger 

 bristles. Scutellum with six bristles, as in L. virens. The ab- 

 domen is provided with broad, copper-colored or bronze-brown, 

 sometimes almost black, transverse bands, on the posterior margin 

 of the segments ; on the edge of these bands the ground-color of 

 the abdomen changes often into yellowish-green. Coxae, femora 

 and tibiae metallic black-green ; the knees yellow ; the tarsi black. 

 Fore coxae elongated, cylindrical, on the front side with long 

 whitish hair, at the tip only with a few small black bristles. In 

 the male the second joint of the fore tarsi is uncommonly short- 

 ened and somewhat thickened, so as to be the shortest of all joints, 

 and almost as broad as it is long. Cilia of the tegulae whitish. 



