ARGYRA. 125 



Systematical arrangement of the Species. 

 I. Scutellum distinctly hairy. 



1. albicans Lw. 



II. Scutellum without hairs. 



A. Abdomen somewhat conical, white, glittering. 



2. nigripes, nov. sp. 5. calcitrans Lw. 



3. albiventris, nov. sp. 6. calceata Lw. 



4. minuta Lw. 



B. Abdomen entirely cylindrical, without white glitter. 



7. cylindrica, nov. sp. 



Description of the Species. 



I. Scutellum distinctly hairy. 



1. A. albicans Loew. % and J. — Scutello piloso, tibiarum postica- 

 rum apice tarsisque posticis nigris. 



Scutellum hairy, tip of the hind tibiae and the hind tarsi black. Long, 

 corp. 0.23—0.24. Long. al. 0.23—0.24. 



Syn. Argyra albicans Loew, Neue Beitr. VIII, 45, 1. 



Male. Covered all over with glittering, silvery-white dust. Face 

 and front of middle breadth, silvery-white. Palpi black. Pro- 

 boscis brownish -black. Antennae black, the third joint more 

 brown-black ; arista distinctly inserted before its end. Cilia of 

 the superior orbit black, the hair-like cilia of the lateral and infe- 

 rior orbits snow-white. Upper side of the thorax and scutellum 

 shining green, still so that the silvery-white dust seems to cover 

 the ground color, even if looked upon from different sides. The 

 scutellum has upon its upper side, besides the usual bristles, some 

 very distinct little black hairs. Ground color of the abdomen 

 greenish-black, the second and third segments have very large, 

 rounded, transparent yellow lateral spots ; otherwise, the whole 

 abdomen is also covered with thick silvery-white dust ; its hairs are 

 almost exclusively black. The small and narrow lamellae of the 

 hypopygiuni are brownish-yellow with black tip and with a black 

 pubescence. Fore coxae yellowish with white dust and with black 

 bristles and little hairs. Middle and hind coxae black with white 

 dust ; their hairs and bristles black. Feet yellow with black 

 hairs ; upon the under side of the fore and middle femora are in- 



