132 BULLETIN 31, LTflTED STATES NATIONAL MUSEUM. 



third longitiulimil vein straight, anteiior cross-vein before the middle of 

 the discal cell. Types of genus, B. conica (Panzer) and^. fcj'co^or (Fallen), 

 Europe. 



TABLE OF SPECIES. 



1. — Arista bare 2 



Arista pubescent (Exochila) notata 



2. — Face and front brownish, covered with grayish pollen ; abdomen mostly 



brown vacua 



Face reddish-yellow, shining except a pollinose band below the autennai ; 

 front of female on upper t no-thirds blackish. Abdomen reddish- 

 yellow with slender brown incisures media 



Brachyopa notata. (Plate V, figs. 5, G.) 



Braclujopa notata Osten Sacken, Bull. Buff. Soc. ISat. Sci. iii, 68; Cat. Dipt., 

 •248; Willistou, Proc. Am. Phil. Soc, xx, 308. 



Eahiiat. — White Mountains, Mount Hood, Washington Territory ! 

 $ ,9 . Length, G'"'". Head light yellow, with faint silvery pollen, and, 

 on the front, with very short white pile. Antennae a little more red- 

 dish, the arista reddish-brown, with rather long pubescence. On the 

 cheeks in front a faint brownish stripe running from the eye. Thorax 

 ochraceous, with short dusky pile; in the middle above a slender, and 

 on each side a broad, whitish dusted stripe. Scutellum reddish-yellow, 

 nearly as long as broad, triangular in outline, with the apex rounded ; 

 the pile black. Abdomen brownish-yellow, the segments with narrow, 

 but distinct, dark brown posterior borders, and, in the middle, with a 

 slender brown stripe, more or less interrupted before each transverse 

 fascia, sometimes only showing a brown spot on each segment, want- 

 ing on the fourth. Legs reddish-yellow ; the base and tip of the hind 

 tibiffi, and the hind tarsi, reddish, on the latter more or less brownish. 

 Wings somewhat tinged with brownish-yellow, distinctly brownish at 

 the tip and along the last section of the fourth vein and the posterior 

 cross-vein ; stigma brownish, posterior cross-vein only a little longer 

 than the penultimate section of the fourth vein, the including angle 

 nearly rectangular. 



Two female specimens from Mount Washington, K. H. (Dr. George 

 Dimmock, No. 1400), and two from Mount Hood, Oregon, and Wash- 

 ington Territory, both males. The latter two specimens show no dif- 

 ferences whatever, that I can see, except that the color is a little darker. 

 The last two joints of the four front tarsi in all are brown. 



Brachyopa media. (Plate V, fig. 7.) 



Braclujopn media Williston, Proc. Amer. Phil. Soc, xx. 308. 



Habitat. — Kern County, California ! 



9. Length, 6 to 7°™. Face and lower third of front reddish-yellow, 

 shining, except across below the antennie, where there is a band of sil- 

 very pollen ; cheeks with an oblique, slender, brownish stripe. Anten- 

 nae reddish-yellow, third joint large; arista yellowish-brown, bare. 



