1895. PEOCEEDINGS OF THE NATIONAL MUSEUM. 393 



pleura reddish yellow; scutelluiu light yellow, beariug two long apical 

 and two much shorter lateral bristles; metanotum reddish brown; 

 abdomen yellow, with a medio dorsal, indistinct brownish vitta; legs 

 and halteres yellow; wings hyaline; stigma wanting. 



Types.— :Sos. 3153 and 3154, U.S.X.M.; length, 4 to 5 mm. Three 

 males and one female. 



Locality. — New Hampshire. 



Genus BRACHTSTOMA, Meigen. 



The species described by Loew belong to BlepJiaroprocta, a genus 

 which he founded for their reception. 



BRACHYSTOMA ROBERTSONII, new species. 



UfaJe. — Head black, grny pollinose; eyes separated as widely as the 

 ui)i>er ocelli, facets of a uniform size; face naked, scarcely one-half as 

 wide as the front; antenna' yellow, the third joint except at base, and 

 the style, brown; first joint shorter tluin the second, the third lanceo- 

 late, scarcely twice as long as broad, twice as long as the second; style 

 terminal, curved, one-third longer than the third joint: proboscis yellow, 

 thick, perpendicular, nearly two-thirds as long as height of head; palpi 

 whitish, perpendicular. Thorax very shining black; pleura blackish, 

 opaque light gray ])ollinose; metanotum and scutellum the same, the 

 latter bearing two bristles ; no pile in front of halteres. Abdomen com- 

 pressed, shining yellowish, a large dorsal blackish-brown spot on each 

 segment; hypopygium large, ascending, each upper lamella j)roduced 

 at the outer angles into a jiair of long, erect, cylindrical, brown pro- 

 cesses; middle lamellae very large, each bearing at its tip a rather large 

 curved process, in front of which is a small, pilose tubercle, while 

 behind it is a smaller tubercle bearing a few long whitish bristles; the 

 inner side of each middle lamella bears a long, cylindrical, brown-tipped 

 process; filament slender, arcuate, proceeding from apex of the rather 

 large lower lamella. Legs, including the coxte, yellow; front coxae not 

 one-half as long as their femora; front and hind femora slender, the 

 middle greatly thickened, nearly twice as thick as the front ones; their 

 under sides thickly beset with very short black spines and with longer 

 black bristles; inner side of middle tibiic also thickly beset with very 

 short black spines; hind femora bearing a black bristle on front side 

 before the apex, a similar one on outer side of hind tibia' near the base; 

 all metatarsi nearly equally slender, the hind ones one-third longer than 

 the others. Knob of halteres yellow. Wings nearly hyaline, stigma 

 wanting, first basal cell slightly longer than the anal, which is a trifle 

 longer than the second basal. 



Tyjye — Xo. 3155, U.S.X.M. ; length, 4 mm. Eeceived by the author 

 from Mr. Charles Robertson. 



Locality. — Illinois. 



