50 DIPTERA OF NORTH AMERICA. [PART II. 



cate white pubescence. Feet whitish-yellow ; hind femora before 

 the tip with a bristle, and upon the second half of their under side 

 ciliated with six to seven very long yellowish-white hairs. Tore 

 tibiae long and slender ; hind tibiae rather stout, but not thickened, 

 only at the base of the hind side somewhat glabrous. Fore tarsi 

 filiform, over If times the length of the tibiae ; the four first 

 joints pale-yellowish, their relative length about as 5 : 4 : 3 : 1^ ; 

 their fifth joint but little shorter than the fourth, somewhat flat- 

 tened, black, beset upon its upper side with rather appressed black 

 hairs. Middle and hind tarsi from the tip of the first joint brown- 

 ish. Cilia of the tegulae yellowish-white. Wings hyaline, rather 

 narrow ; the costa near the tip of the first longitudinal vein with a 

 distinct swelling ; the third longitudinal vein not broken ; the hind 

 transverse vein perpendicular and straight. 

 Hab. Chicago. (Osten-Sacken.) 



21. ©. variabilis Loew. % and 9. — Laete viridis, facie maris pal- 

 lide aurea, prope os albida, facie fceminse tota alba, antennis rufis, ocu- 

 loram ciliis inferioribus albidis, tegularum ciliis fiavicantibus, pedibus 

 fiavis, alis cinereo-hyalinis. 



Handsome green ; the face of the % pale golden-yellow, whitish below ; 

 the face of the 9 white ; antennae red ; cilia of the inferior orbit whitish, 

 cilia of the tegulse yellowish ; feet yellow ; wings grayish-hyaline. Long, 

 corp. 0.19. Long. al. 0.19. 



Syn. Dolichopus variabilis Loew, Neue Beitr. VIII, 17, 14. 



Handsome green, bright. Face of the £ more pale gold-colored 

 than ochre-yellowish, near the oral border whitish ; face of the 9 

 proportionally narrow, white. Antennae yellowish-red ; their third 

 joint short, ovate, generally red only at the base and on the under 

 side, otherwise brownish-black, sometimes brown only at the tip or 

 entirely reddish-yellow. Front bright green. Fore coxae yellow- 

 ish-white, beset, besides the black bristles near their tip, with very 

 delicate minute whitish hairs. Middle and hind coxae of the same 

 color, but colored with black upon the greater part of the outside. 

 Feet yellowish ; hind femora before the tip with a bristle, in the 

 J 1 ciliated upon the -under side with very long pale-yellowish 

 hairs. Fore tarsi of the g about 1-J times the length of the tibiae ; 

 those of the 9 hardly as long as the tibiae, blackened from the tip 

 of the first joint, plain also in the g . Middle tarsi of the same 

 color as the fore tarsi. Hind tibiae also in the g not stout, but 



