90 DIPTERA OP NORTH AMERICA. [PART II. 



Green, feet and coxae yellow, the middle coxse 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 Jimbriatus Loew, Neue Beitr. VIII, 32, 12. 



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

 white-grayish dust. Antennas 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 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. Coxa? and feet yellow, more slender than 

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

 middle coxse blackish ; the fore and hind coxse hardly somewhat 

 blackened at their extreme basis. Tarsi somewhat infuscated 

 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. 



Hab. Maryland. (Osten-Sacken.) 



14. G. despicatnas Loew. % . — Viridis, antennis nigris, facie et 

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

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

 longitudinalibus tertia et quarta subconvergentibus ; lamellis hypopygii 

 pallide flavescentibus. 



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

 yellow ; hind tibiae 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. Lamella3 of the hypopygium pale-yellowish, crescent-shaped, 



