336 DIPTERA OP NORTH AMERICA. [PART II. 



what broader than in the males of most of the other species, and 

 white. All the coxae black, only the extreme tip yellow. Feet 

 yellow ; the four anterior tarsi, from the tip of the first joint, 

 blackened ; the hindmost black, with the exception of the basal 

 half of the first joint ; the last joint of the fore tarsi not enlarged. 

 Hab. New York. (Osten-Sacken.) 



Observation. — I dare not positively decide whether a male, 

 which Mr. Le Baron caught in Illinois, belongs to this species or 

 not. It differs from the above described typical males in a re- 

 markable degree, as it has the first two-thirds of the fore femora 

 and the upper side of the hind femora infuscated, and the hind 

 tarsi, with the exception of the extreme basis of the first joint, 

 of a black color ; moreover, the third joint of the antennae is a 

 little shorter. I would not venture to establish a separate species 

 upon this single specimen. 



2 1 ?. G-. meniscus Loew. % and 9 • — ./Eneo-viridis, nitens, antennas 

 nigris, coxis anticis praeter basim, pedibus lamellisque hypopygii flavis. 



Metallic green, shining ; antennae black ; fore coxse, with the exception of 

 the basis, feet, and lamellae of the hypopygium, yellow. 



Long. corp. 0.15. Long. al. 0.15. 



Syn. Gymnopternus meniscus Loew, Berl. Ent. Zeitschr. VIII, 94, 88. 



Resembles the G. coxalis very much, but is somewhat larger 

 and more of a bronze color. Fore coxae black always only at the 

 basis ; the third joint of the antennae a little shorter and broader, 

 all the rest like the preceding. 



Hab. District of Columbia. (Osten-Sacken.) 



38. G-. humilis, nov. sp. % and 9 . — JEneo-viridis, nitens, antennis 

 nigris, facie alba, coxis anticis totis, pedibus lamellisque hypopygii flavis, 

 tibiarum posticarum apice infuscato, tarsis posticis totis nigris.. 



Metallic green, shining ; the antennae black ; face white ; the whole fore 

 coxae, the feet, and the lamellae of the hypopygium yellow ; the tip of 

 the hind tibiae infuscated ; hind tarsi entirely black. 



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



Metallic green, shining. Front covered with white dust. The 

 antennae altogether black. The narrow face of the male white, 

 the very broad face of the female whitish. The crescent-shaped 

 lamella? of the hypopygium yellow, sometimes almost dark-yellow. 

 Fore coxae altogether yellow ; middle coxae on the whole outside, 



