92 DIPTERA OP NORTH AMERICA. [PART II. 



a short but distinct and rather striking pubescence. Antennae 

 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 coxae yellow-brownish at 

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

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

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

 upper side of the fore tibias, consists of comparatively short 

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

 blackish-gray tinge. The third and fourth longitudinal veins 

 parallel towards the end. 

 Hob. Pennsylvania. 



IT. G. parvicornis LOEW. . Viridis, thorace c?erulescente, niti- 

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

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

 infuscatis, lamellis hypopygii pallide flavicantibus, appendicibus inte- 

 rioribus shnplicibus. 



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 lamellse 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. Antennae 

 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 lamellse of the hypopygium 

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

 cent- r haped. Coxae and feet whitish-yellow ; the middle coxae on 

 the outside almost up to the tip, and the hind coxse at the voot, 



