TO DIPTERA OF NORTH AMERICA. [PART II. 



tened. The bristles on the upper side of the middle tibiae are very 

 prolonged and become very slender towards their tip. The first 

 joint of the middle tarsi is of considerable length, ciliated on its 

 upper side with about nine or ten very long, bristle-like black hairs. 

 Hab. Pennsylvania j Maryland ; District Columbia. (Osten- 

 Sacken.) 



38. D. scoparius, nov. sp. %. — Viridis, facie Candida, antennis 

 nigris, articulo priino infra rufo, ciliis oculorum inferioribus pallidis, ciliis 

 tegularum nigris, pedibus fiavis, tarsis ex parte nigris, articulis antico- 

 rum ultimis duobus subdilatatis et utrinque nigro-pennatis, vena ala- 

 rum longitudinali quarta non fracta. 



Green, face snow-white, antennae black, the first joint upon the under side 

 red ; cilia of the inferior orbit pale ; cilia of the tegulse black ; feet yel- 

 low, tarsi partly black ; two last joints of the fore tarsi somewhat thick- 

 ened, feathered with black on both sides ; the fourth longitudinal vein 

 of the wings not broken. Long. corp. 0.24. Long. al. 0.24. 



Bright metallic green. Antenna? black, the lower edge of the 

 first joint red ; third joint short. Face snow-white ; palpi brown- 

 ish-yellow, the basis black. Cilia of the inferior orbit yellowish. 

 Front metallic green. Fore coxae yellow, blackened at the base 

 only to a moderate extent, upon the front side with a black pubes- 

 cence. Middle and hind coxae blackish, only the extreme tip and 

 the trochanter yellow. Feet yellow. Hind femora before the tip 

 with a bristle. Tibiae plain, with rather numerous black bristles ; 

 hind tibiae at the tip not blackened, upon the hind side without 

 glabrous spot. Fore tarsi from the tip of the third joint black, 

 not quite once and a half the length of the tibiae ; their two last 

 joints are only very slightly enlarged, but closely feathered with 

 bristle-like minute black hairs upon the front and hind side, so that 

 they seem to be rather broad. Middle and hind tarsi plain, from 

 the tip of the first joint black ; upon the upper side of the first 

 joint -of the middle tarsi, not far from the tip, there is a stout black 

 bristle. Cilia of the tegulae black. Wings grayish-hyaline, of 

 the usual formj fourth longitudinal vein not broken and the fore 

 margin, near the tip of the first longitudinal vein, not thickened. 

 The lamellae of the hypopygium of the only specimen which I 

 possess are almost destroyed; I am able to state only that they 

 are yellowish. 



Hab. Maine. (Packard.) Mass. (Sanborn.) 



