

Vol. XXviii] ENTOMOLOGICAL NEWS. 123 



New North American species of Dolichopodidae (Dip.). 



By M. C. VANDUZEE, Buffalo, New York. 



Key to the North American Species of Mcsorhaga. 



1 Femora wholly yellow ; (females) 5 



Femora more or less black 2 



2 All tibiae and tarsi black or brown (fore pair somewhat yellowish 



in the females) nigripes Aid. 



Tibiae yellow (males) 3 



3 Hypopygium with small yellow appendages albiciliata Aid. 



Hypopygial appendages fully one-third as long as the hypopy- 



gium 4 



4 Fore and middle femora black or green but yellow at base and 



tip caudata V. D. 



Fore femora wholly yellow, middle femora black at base on the 



lower side varipes sp. nov. 



5 All coxae black albiciliata Aid. 



Fore coxae yellow 6 



6 Bristles of the thorax mostly pale, hairs of abdomen pale 



townsendii Aid. 

 Bristles of the thorax and hairs on the base of the abdomen 



above black borealis Aid. 



Mesorhaga varipes sp. nov. 



$ . Length 4 mm. Face and front green, the former broad with thick 

 coarse white pollen which almost conceals the ground color in some 

 lights; antennae black, bristles of second joint yellowish; ocellar bristles 

 black with a bunch of small pale hairs back of them; a few long yel- 

 lowish bristly hairs on each side at the upper corners of the eyes ; a 

 few of the orbital cilia at the upper corner of the eye long and black- 

 ish, lower orbital cilia white. 



Thorax blue-green; pleurae with white pollen; bristles on the anterior 

 portion of the dorsum blackish, those on the posterior part and the four 

 on the margin of the scutellum yellowish. 



Abdomen blue-green, its incisures very narrowly yellow ; hairs on the 

 dorsum of the abdomen short and yellow, those on the venter long and 

 white; hypopygium and its appendages shining black, the latter long and 

 fringed with short pale hairs. 



Coxae black or green with white pollen; fore pair with long white 

 hairs on the front surface; tips of coxae and the trochantcrs yellow; 

 fore femora wholly yellow; middle femora with a black streak below 

 from the base to about the middle; hind femora black with yellow tips; 

 all femora with long white hairs below; tibiae yellow, the tips of the 

 hind pair a little brownish ; tarsi infuscated from the tip of the first 



