168 DIPTERA OF NORTH AMERICA. [PART II. 



B. The last segment of the fourth longitudinal vein interrupted. 



7. I>. interruptus LOEW. % . Obscure virescens, modice nitens, 

 t'emoribus et tibiis concoloribus, geiiibus testaceis, tarsis fuscis, vena 

 alarum longitudinal! quarta interrupta. 



Dark green, moderately shining ; femora and tibiae also green ; knees 

 brownish-yellow ; tarsi brown ; the fourth longitudinal vein interrupted. 

 Long. corp. 0.23. Long. al. 0.20. 



SYN. Diaphorus interruptus LOEW, Wien. Ent. Monatschr. V, 37, 9. LOEW, 

 Neue Beitr. VIII, 59, 6. 



Male. Rather dark green, not very shining. Face of uniform 

 breadth with the front, very broad for a male, covered with thick 

 whitish dust, so that the ground color becomes invisible, moder- 

 ately deepened and without a transverse swelling. Palpi and 

 proboscis black. Antennae black ; their first joint somewhat longer 

 than in other species ; the third joint rounded ; position of the 

 arista distinctly dorsal. Front with thick dusky-whitish powder, 

 so as to conceal the ground color. Cilia of the upppr orbit black ; 

 the cilia of the lateral and inferior orbits are whitish and form a 

 considerable fringe. Upper side of the thorax and of the scutel- 

 luni dark-green and dull from grayish dust. Abdomen more 

 shining-green, with extensive but less thick whitish dust and on 

 the anterior part of the segments coppery to a large extent. The 

 four stout bristles on the posterior end of the small and imbedded 

 hypopygium are very prominent. Coxse black ; the fore and 

 middle coxae on the front side more black-green and fringed with 

 black bristles. Femora metallic green, stout, beset with dense 

 and coarse black hair, on the under side with numerous, but not 

 strong black bristles. Knees yellowish-brown. Tibia3 on the 

 under and front side black-brown, on the upper and hind side 

 dark metallic-green, of strong structure and with unusually strong 

 bristles. Tarsi black-brown, the root of the anterior ones and 

 the under side of all the others more brownish-red ; all tarsi are 

 stouter and less elongated than in the other species known to me, 

 also with more hair ; the pulvilli are all very much enlarged and 

 elongated. Tegulae yellowish with pale-yellowish cilia. Wings 

 hyaline, scarcely a little tinged with gray, alternately with yellow 

 and brown veins ; first longitudinal vein somewhat distant from 

 the margin of the wing and reaching about as far as the middle of 

 the wing ; the third longitudinal vein is very close to the second 



