96 DIPTERA OP NORTH AMERICA. [PART II. 



Green, moderately shining ; the red antennae brown towards the tip ; the 

 posterior margin of the pleurae, the venter, the 00x33 and the feet pale- 

 yellowish. The hypopygium of the $ very much thickened. Long. 

 corp. 0.15. Long. al. 0.14 0.15. 



SYN. Gymnopternus crassicauda LOEW, Neue Beitr. VIII, 35, 20. 



Green, moderately shining ; face and front with some whitish 

 dust ; in well preserved 9 a delicate and pale-colored pubescence 

 can be seen upon the lower part of the face. Antennas red, of 

 very moderate size, the third joint at the end rounded and infus- 

 cated. Arista of the J* with a short but distinct, that of the 9 

 with a comparatively long and very striking pubescence. Cilia 

 of the inferior orbit black. Thorax somewhat dull from grayish 

 dust. The hairs upon the scutellum delicate and rather diffi- 

 cult to perceive. Pleurae gray, their whole posterior margin 

 (epimera metathoracica) yellowish. Tenter yellow ; -upon the 

 anterior segments of the abdomen this color extends somewhat 

 upon the upper side ; in well preserved specimens, however, it is 

 concealed by a whitish dust ; in the 9 this yellow coloring some- 

 times extends further, so that there is upon the first segment a 

 complete, and upon the second an interrupted yellow band. Coxa? 

 and feet pale-yellowish. Tarsi towards the end scarcely a little 

 infuscated. Cilia of the tegulse black. Wings with a slight yel- 

 low-grayish tinge. The third and fourth longitudinal veins to- 

 wards the end almost entirely parallel. The hypopygium of the 

 g uncommonly thickened. The very small crescent-shaped lamellae 

 have a yellowish coloring and a fringe of short, delicate and sparse 

 hairs. 



Hab. New York. (Osten-Sacken.) 



. G. minuf us LOEW. . Viridis, antennis parvis rufis, pleurarum 

 margine postico, ventre, coxis pedibusque pallide flavicantibus, coxis 

 anticis denudatis, hypopygio non incrassato. 



Green, the small antennas red, the posterior margin of the pleura, the ven- 

 ter, the coxse and the feet pale-yellowish ; fore coxae bare ; the hy- 

 popygium not thickened. Long. cprp. 0.10. Long. al. 0.11. 



SYN. Gymnopternus minutus LOEW, Neue Beitr. VIII, 35, 21. 



Green, quite bright, face with a dense, front with a thin whitish 

 dust. Antennae brownish-red, small, the third joint at the end 

 dark-brown. Arista with a short but distinct pubescence. Cilia 

 of the inferior orbit black. Thorax a little dull from a white- 



