92 DIPTERA OF NORTH AMERICA. [PART II. 



a short but distinct and rather striking pubescence. Antennas 

 small, black-brown, second joint and the root of the third red ; 

 the third joint rounded at the end and beset with very distinct 

 but not long hairs. Arista with a comparatively long, very dis- 

 tinct pubescence. The front seems in most directions light 

 brownish-gray ; in others nearly whitish. Cilia of the inferior 

 orbit black. Upper side of the thorax rather blue and dull on 

 account of a gray-brownish dust. Scutellum apparently glabrous 

 upon its upper surface. The color of the abdomen varies between 

 bronze-black and bronze-green. Fore coxa? yellow-brownish at 

 the base ; middle coxae almost up to the tip, hind coxas about as 

 far as the middle, blackish. Feet yellowish. Tarsi moderately 

 infuscated towards the tip. The usual row of bristles on the 

 upper side of the fore tibise, consists of comparatively short 

 bristles. Cilia of the tegulse black. Wings with a rather strong 

 blockish-gray tinge. The third and fourth longitudinal veins 

 parallel towards the end. 

 Hob. Pennsylvania. 



17. G. parvicorsiis LOEW. $ . Viridis, thorace cserulescente, niti- 

 dissimo, antennis parrls, nigris, articulo secundo et articuli tertii basi 

 rufis ; coxis anticis totis, pedibusque pallide flavis, tarsis apicem versus 

 infuscatis, lainellis hypopygii pallide flavicantibus, appeudicibus inte- 

 rioribus simplicibus. 



Green, the bluish-green thorax very bright ; the small antennae black, the 

 second joint and the root of the third red, the whole fore coxae and the 

 feet pale yellowish ; tarsi towards the tip brownish ; the lamellae of the 

 hypopygium pale yellowish ; the interior appendages plain. Long, 

 corp. 0.12. Long. al. 0.12. 



SYN. Gymnopternus parvicornis LOEW, Neue Beitr. VIII, 34, 16. 



Green, bright, face and front with a white dust. Antennas 

 small, black ; second joint and the root of the third red ; third 

 joint remarkably small and not rounded at the tip. Arista with 

 a short but distinct pubescence. Cilia of the inferior orbit black. 

 Upper side of the thorax bluish-green and very bright. Upon 

 the surface of the scutellum there seem to be, besides the usual 

 bristles, a few small hairs. The small lamellae of the hypopygium 

 are whitish-yellow with a scarcely perceptible black margin, cres- 

 cent-shaped. Coxse and feet whitish-yellow ; the middle coxas on 

 the outside almost up to the tip, and the hind coxae at the root, 



