SUPPLEMENT. 335 



from all other species with black feet, by its smaller size, and by 

 its color, which is not black-green, but pure green. 



25. ti. clialcocliriBs, nov. sp. % and £ . — vEneo-riridis, nitons, 



antennis nigris, pedibus flavis, coxis omnibus, prseter apicem, lamellisque 



hypopygii nigris. 

 Metallic green, shining ; antenna black ; feet yellow, all the coxa? with the 



exception of the tip and the lamella? of the hypopygium black. 

 Long. corp. 0.15—6.16. Long, ah 0.15—0.16. 



Metallic green, shining. Antennae entirely black; the third 

 joint short, with a not easily perceptible pubescence. Front 

 covered with white dust. Face of the % ochre-yellow, sometimes 

 rather brownish-yellow, that of the 9 grayish-white'; cilia of the 

 inferior orbit black. Upper side of the thorax covered with gray 

 or brown-gray dust, which is distinctly visible, when the upper 

 side of the thorax is looked at in an oblique direction. Fore 

 coxae blackened as far as the middle or nearly as far as the tip; 

 the four hind coxse yellow only at the tip. Feet yellow; tarsi 

 from the tip of the first joint strongly colored with brown or 

 blackened, the crescent-shaped lamellae of the hypopygium black. 

 "Wings tinged with blackish-gray and with brownish-black veins. 



Hab. District of Columbia ; New York. (Osten-Sacken.) 



Observation. — The female has, in the plastic characters, much 

 in common with the female of G. spectabilis, of which I have now 

 three specimens ; but the latter is somewhat larger, and the third 

 and fourth longitudinal veins of the wings seem to be somewhat 

 closer to each other ; I cannot, therefore, believe that G. spectabi- 

 lis is only a variety in color of G. chalcochrus, and hope thai my 

 view will be sustained through the discovery of the still unknown 

 male of G. spectabilis. 



26. CJ. coxalis Loew. %. — iEneo-viridis, nitens, antennis nigris, 



coxis omnibus prater apicem nigris, pedibus lamellisque hypopygii 



flavis, articulo ultimo tarsorum anticoruui maris non dilatato. 

 Metallic green, shining; antenna black; all coxa\ with the exception of 



the tip, black; the feet and the lamella of the hypopygium yellow; the 



last joint of the fore tarsi of the male not enlarged. 

 Long. corp. 0.14. Long, ah 0.14 — 0.15. 

 Syn. Gymnoptermts coxalis Loew, Berl. Ent. Zeitschr. VIII, 04. 87. 



Metallic green, shining. Front with whitish dust. The an- 

 tennae altogether black; their third joint ovate; the feee some- 



