152 DIPTERA OF NORTH AMERICA. [PART IT. 



1. I,, cingiilcita Loew. £ . — Viridis, laete splendens, abdomine non 

 pollinoso, (singulis fiavis. 



Green, brightly sliining, abdomen without white dust and with yellow 

 bands. Long. corp. 0.19. Long. al. 016. 



Syn. Leucostola cuujuluta Loew, Neue Beitr. VIII, 53, 1. 



Male. Face very narrow, silvery-white. Palpi snow-white. 

 Proboscis brownish-black. Antenna? black ; the third joint 

 black-brown ; the arista inserted close to its tip. Front black 

 with silvery-white dust. Cilia of the upper orbit black, extremely 

 short and delicate ; cilia of the inferior and lateral orbits snow- 

 white. Thorax metallic green, very bright, dusted only on the 

 lateral margin. Scutellum of the same color, without hair, besides 

 the usual bristles. Abdomen without any white dust ; the first 

 segment mostly black ; the second yellowish, transparent, with 

 metallic black border on the posterior margin and with an indis- 

 tinct blackish spot near the middle of the anterior margin ; third 

 segment also yellowish, transparent, and at the basis with a rather 

 broad violet-black transverse stripe, Insinuated on the hind side, 

 and with a narrow blackish-green border on the posterior margin ; 

 the coloring of the fourth segment of the abdomen is the same, 

 but the bands on the fore-margin and the posterior border are 

 broader, so that the yellow part of the segment has the appear- 

 ance of being divided into two spots ; the fifth segment has no 

 yellow color, but is violet-black near its basis and black-green 

 towards the tip. The same color prevails on the small hypopy- 

 gium, the extremely small lamella? of which are brownish. The 

 rather long but not very coarse hair upon the abdomen is chiefly 

 black, only upon the fore part of the first segment and upon the 

 venter it is yellow-whitish. Coxa? and feet pale-yellowish ; fore 

 coxa? with white hair and yellowish-white little bristles. Middle 

 and hind coxa? near the basis a little blackened and also fringed 

 with pale hairs and bristles. Femora slender, the hind ones 

 slightly infuscated at the tip on the upper side. The hair upon 

 the femora is blackish on the upper side and near the tip, whitish 

 near the basis and on the under side ; the very delicate whitish 

 hair on the under side of the fore and middle femora is rather long. 

 Fore tibia? without any bristles ; middle and hind tibia? only with 

 very few delicate and short bristles. Fore and middle tarsi slen- 

 der, but not very long ; the first joint about as long as the others 



