90 DIPTERA OF NORTH AMERICA. [PART II. 



Green, feet and coxae yellow, the middle coxae however, with the excep- 

 tion of the tip, blackish ; the interior appendages of the hypopygium 

 elongated, hairy, penicillate. Long. corp. 0.10. Long. al. 0.11. 



SYN. Gymnopternus fimbriatus LOEW, Neue Beitr. VIII, 32, 12. 



Rather light-green,- bright. Face and front covered with a 

 white-grayish dust. Antennae entirely black, short, the third 

 joint rounded. Arista with an extremely short and very imper- 

 ceptible pubescence. Cilia of the inferior orbit black. The upper 

 side of the thorax moderately bright. Upon 1 the scutellum only 

 traces of very imperceptible hairs. The lamellae of the hypopygium 

 whitish-yellow, crescent-shaped, ciliated with stiff black hairs ; the 

 interior appendages somewhat elongated, with a brush-like tuft of 

 long hairs at the end. Coxaa and feet yellow, more slender than 

 those of the next following species ; most of the outside of the 

 middle coxae blackish ; the fore and hind coxae hardly somewhat 

 blackened at their extreme basis. Tarsi somewhat infuscatcd 

 towards the tip, especially the hind ones. The usual row oi 

 bristles on the upper side of the fore tibiae is extant ; the single 

 bristles of middle size. Cilia of the tegulae black. Wings tinged 

 with gray. 



Hob. Maryland. (Osten-Sacken.) 



14. G. despicatus LOEW. % . Viridis, antennis nigris, facie et 

 fronte albido-pollinosis, pedibus flavis, tibiis posticis prope apicem supra 

 paulo longius pilosis, quam in speciebus ad quas accedit ; alarum venia 

 longitudinalibus tertia et quarta subconvergentibus ; lamellis hypopygii 

 pallide flavescentibus. 



Green, antennae black, face and front covered with a whitish dust ; feet 

 yellow ; hind tibia? on the upper side towards the end with longer hairs 

 than in the allied species ; the third and fourth longitudinal veins of the 

 wings show a slight convergency ; lamellae of the hypopygium pale yel- 

 low. Long. corp. 0.12. Long. al. 0.12. 



SYN. Gymnopternus despicatus LOEW, Neue Beitr. VIII, 33, 13. 



Green, rather bright. Face and front covered with whitish 

 dust. Antennae entirely black and only of middle length ; the 

 third joint rather rounded at the tip. Arista with a very 

 short, hardly perceptible pubescence. Cilia of the inferior orbit 

 black. Upon the scutellum of the described specimen there are, 

 besides the two bristles, only a few small, pale hairs on the mar- 

 gin. Lainellce of the hypopygium pale-yellowish, crescent-shaped, 



