36 DIPTERA OF NORTH AMERICA. [PART II. 



duobus ultimis valde dilatatis, fenioribus posticis nigro-ciliatis, tibiis 

 posticis inerassatis. 

 £ . Pedibus simplicibus, tarsis anticis inde ab articuli prirai apice nigris. 



Metallic green ; antenna?, cilia of tbe inferior orbit and of tbe tegula? black ; 



all coxa? entirely dark ; tarsi yellow ; the whole second half of the hind 



tibia?, the middle tarsi from tbe tip of tbe first joint and the whole hind 



tarsi black. 

 £ , Fore tarsi attenuated ; the three last joints black, compressed, the two 



last joints much enlarged; hind femora ciliated with black; hind tibia? 



incrassated. 

 9. Feet plain, fore tarsi from the tip of the first joint blackened. Long. 



corp. 0.25—0.26. Long. al. 0.22. 



Stn. DoLchopus pachijrnemus Loew, Keue Beitr. VIII, 13, 6. 



Dark metallic green, bright. Face of the J* narrow, ochre-yel- 

 low; face of the 9 broad, grayish-yellow. Antenna? entirely 

 black ; the third joint ovate. Front bright, generally for the most 

 part steel-blue. The cilia of the inferior orbit black. Thorax 

 with a rather broad brass-colored middle line. Abdomen coppery 

 towards the end. All the coxae black, only their extreme tip 

 somewhat brownish-yellow. Feet dark yellow ; hind femora on 

 the extreme tip darker, before the same with a strong bristle ; all 

 tibia? with numerous bristles ; hind tibiae upon the entire second 

 half black; middle tarsi from the tip of the first joint black; 

 hind tarsi entirely black. Tegula? with black cilia. Wings some- 

 what shorter than usual, in the 9 somewhat more dusky than in 

 the male, especially somewhat darker towards the fore margin. 



Male. Fore tarsi not very much longer than the fore tibia? ; 

 their first and second joints slender, stalk-like, yellow ; the first 

 one much longer than the second; the following joints black, flat- 

 tened ; the third somewhat broader towards the end ; the fourth 

 much enlarged, of a nearly triangular form, beset upon the upper 

 side with short, close, minute black hairs ; the fourth joint is like- 

 wise much enlarged, still not as broad as the third, and of a more 

 ovate form. Hind tibia? much thickened, stoutest in the middle, 

 and marked upon the upper side with a narrow pale line running 

 from the middle to the tip ; hind femora ciliated beneath with long 

 black hairs. Lamella? of the hypopygium dingy yellow, with a 

 broad black border, of moderate size and of a rather round shape, 

 jagged on the apical margin and fringed with black bristles. 



Female. Feet plain ; the fore tarsi rather blackish already from 



