274 DIPTERA OF NORTH AMERICA. [PART II. 



Male. Very handsomely shining, green, the abdomen, except- 

 ing the two last segments, gilded. Proboscis dingy yellow, the 

 small palpi black, with white hairs. Face without hairs, dusted 

 with white. Antennae entirely black, small ; the second joint 

 with short, minute bristles ; the arista itself of only moderate 

 length. Front with the usual black bristles, which have but a 

 moderate length, otherwise bare. Bristles upon scutellum and 

 thorax of moderate length; upon the latter there are only two 

 bristles. The black hairs of the abdomen are very scattered, and 

 the black bristles before its incisures are rather short. The small 

 hypopygium is black ; its external appendages are very narrow, 

 black, and with black hairs. Fore coxa? pale-yellow, with 

 scattered and rather short whitish hairs, and beset with several 

 white bristles. Middle and hind coxae black. Feet very long 

 and slender, pale-yellow. Femora slender, upon the under side 

 sparely fringed with short, minute, whitish hairs. Tibia? likewise 

 very slender, without bristles, with a very short black pubescence, 

 which is diverging fringe-like on the middle tibiae and is much 

 closer upon their under side. Fore tarsi extremely slender, more 

 than once and two-thirds the length of the tibiae ; their first joint 

 alone somewhat longer than the tibia?, brownish-yellow ; the follow- 

 ing joints brownish-black and of decreasing length. Middle tarsi 

 likewise very slender, about once and a half the length of the 

 tibia? ; their short black pubescence diverging, so that it appears 

 fringe-like ; their first joint brownish-yellow, at the extreme tip 

 brownish-black ; the following joints brownish-black and of de- 

 creasing length. Hind tarsi nearly as long as the tibia? ; first joint 

 brownish-yellow, and but little longer than the following joints 

 taken together ; the latter brownish-black and of decreasing length. 

 All the tarsi entirely without bristles. Halteres pale-yellow with a 

 blackish peduncle ; tegula? blackish with whitish cilia. Wings on 

 the anterior margin, from their basis to the tip of the second longi- 

 tudinal vein, regularly ciliated with rather stout, minute, black 

 hairs ; the third longitudinal vein rather distinctly curved back- 

 wards at its end ; the anterior branch of the fourth longitudinal 

 vein diverges from it at a nearly right angle and turns then at a 

 very rounded, somewhat obtuse angle towards the margin, which 

 it reaches very near before the apex and not far from the tip of 

 the third longitudinal vein ; posterior transverse vein rather 

 oblique and somewhat inflected. 



