1882.] ^^'-* [Williston. 



Avhitish-yellow pile, median stripe and cheeks sliiuing black ; antennge 

 reddish-brown, arista red pubescent. Thorax black, with rather short, 

 thick, yellow pile; scutellum sub-translucent yellow with longer pile. 

 Abdomen black, thickly covered with yellow pile more, or less intermixed 

 with black at the incisures, second segment on the sides broadly yellow, 

 in the middle wholly opaque ; third segment on the sides with smaller 

 reddish spots, extending one-half or two-thirds of the way back, and a 

 broad, shining cross-band narrowly interrupted in the middle ; fourth 

 segment shining, with a small opaque spot in front. Legs black Avith 

 black pile, knees and basal third of all the tibia3 yellow. Wings hyaline 

 with a small dark brown spot. Long. corp. 10-12 mm. Four specimens. 

 Washington Territory. 



Eristalis BrousU, sp. nov. 



9- — Eyes with short whitish pile ; front brownish-black in the middle, 

 thickly covered with red dust on the sides, pile below yellowish, black 

 near the ocelli, face with whitish pile and yellowish-white dust, narrowly 

 shining black in the middle, cheeks black, shining ; antennae brownish- 

 black, arista brownish-yellow, sparsely pilose. Thorax on the dorsum 

 brownish-olivaceous, somewhat brassy on the sides ; in the middle form- 

 ing two rather broad stripes, inclosing a narrow black stripe that is 

 broadest beyond the suture ; pleurse black with longer whitish pile, the pile 

 of the dorsum rather short reddish-yellow ; scutellum reddish-brown. 

 Abdomen black, sub-metallic shining, with very short whitish pile, pos- 

 terior margins of second, third and fourth segments broadly whitish-yel- 

 lowy the velvety black occupies the whole of the middle of the second 

 segment, expanding narrowly outward in front of the whitish posterior 

 margin ; third segment has the velvety black confined to a triangle on the 

 anterior part, extending narrowly backward ; fourth segment Avith a 

 small spot in front. Legs black with white pile, tips of femora and basal 

 third of all the tibiae yellow. Wings hyaline with an indistinct brownish 

 spot. Long. Corp. 10-13 mm. Three specimens. Massachusetts, July 3. 



For some time I was inclined to consider this the female of what I 

 identify as K Meigenii Wied. 



W. — Wings covered with minute pile, brown on anterior portion; thorax 

 often with yellow sj^ots Pterootila. 



Pteroptila crucigera (Wied.), Aus. Zwei. ii, lOo, 2. Georgia! 

 Florida, Texas, Central America. 



XI. 



J J- — Smill cross-vein at or beyond the middle of discal cell. 

 a- — Crista dorsal. 



/?. — Third longitudinal vein deeply sinuous. 

 yy. — Marginal cell open ; posterior femora swollen. 



mOC. AMER. PHILOS. SOC. XX. 112. 2o. PRIXTED AUGUST 8, 



