ARGYRA. 131 



basis. Fore and middle femora without any longer hairs on the 

 under side ; the hind femora have a row of black bristle-like hairs, 

 inserted rather more on their hind side than upon the under side. 

 Tarsi towards their end not infuscated, but only very little darker; 

 the first joint of the fore tarsi is 1^ the length of all the following 

 joints taken together, on the under side with a row of delicate 

 bail's; the first joint of the middle tarsi not quite as long as all the 

 other joints together ; bind tarsi unusually short, the first joint qoI 

 mueb shorter than all the others, a little thickened, on the under 

 side with rather long bristle-like hairs ; the second and third joints 

 of the hind tarsi of about equal length. The cilia of the tegular, 

 which have a blackish margin, are white-yellowish. Wings some- 

 what tinged with yellowish-gray, with yellowish-browir veins ; the 

 last segment of the fourth longitudinal vein is but gently inflected 

 forward. 



Hab. New York. (Osten-Sacken.) 



6. A. calceata Loew. J.— Scutello nudo, peclibus pallide flavis, 



tarsis posticis nigris. 

 Scutellum bare, feet pale-yellow, with black hind tarsi. Long. corp. 0.16. 



Long. al. 0.15. 

 Syn. Argyra calceata Loew, Neue Beitr. VIII, 47, 4. 



Female. Face, for a female, of moderate breadth, silvery- 

 white. Palpi rather large, black, with almost silvery-white dust ; 

 proboscis brownish-black. Antenna? black; third joint small. 

 with an acute angular tip; arista distinctly inserted before its 

 end. Cilia on the upper orbit black, extremely short and delicate 

 Cilia of the lateral and inferior orbits white. Thorax shining 

 green, in the vicinity of the shoulders rather thickly covered with 

 white dust, so as to induce the belief that the males are altogether 

 covered with silvery-white dust. Scutellum also shining green 

 and with the exception of the usual bristles, bare. Ground color 

 of the abdomen greenish-black; the second, third ami fourth seg- 

 ments yellow, with the exception of the extreme anterior margin, 

 the posterior margin and a narrow, not always distincl middle 

 line ; on the sides of the segments and towards the tip of the ab- 

 domen there is some white dust. Coxa' and feet, pale-yellow ish . 

 fore coxa- with delicate whitish hair and wilh black bristles : mid- 

 dle coxa' with a gray Spot on the outside; hind femora scarcely a 

 little darker at the tip, hind tibiae tit the tip not of a dark color. 



