248 Annals E?itomological Society of America [Vol. XV, 



reddish yellow, more reddish apically; second, third and fourth segments 

 and their lateral margins, except anteriorly, very narrowly brownish 

 or reddish brown; pile short, yellowish. Legs yellowish, including the 

 coxse; hind tibiee with a slightly darker pre-apical band; hind tarsi 

 brownish. Wings very slightly darkened with luteous, the tip a little 

 blackened. 



Female. Face shining, except below the antennae; front blackish 

 above, whitish pubescent except a median longitudinal shining stripe 

 connecting with the shining area above the antennas; pollen of the 

 thorax more whitish; wings almost hyaline; legs somewhat paler. 

 Otherwise as in the male. 



B. media was originally described from California from a 

 single female specimen. I have before me a female from 

 Teulon, Manitoba, May 15, 1920, and two males taken at 

 Orillia, Ontario, on May 30, 1921. 



The specimens described above agree perfectly with Willis- 

 ton's description and I consider them absolutely typical. 

 B. r ufiahdominalis agrees fairly well wath the above description, 

 but the color appears to be darker and the eyes are narrowly 

 separated and approach each other near the ocelli which would 

 make the vertical triangle short, while in media the vertical 

 triangle is long and the eyes touch nearer the antennal base 

 than the ocelli. The only other species w^hich is really con- 

 fusing is flavescens, which has a wholly pale thorax (Johnston 

 says the thorax may be brown before the suture) and a yellowish 

 front in the female. The face is also more concave. I believe 

 these three species are abundantly distinct, but a large series 

 of all the species, and a comparison of the male genitalia will 

 be necessary to definitely determine this point. A com- 

 parison with B. hicolor is necessary. Strangely enough Jones 

 did not even mention media in establishing his B. riifiabdomi- 

 nalis, which seems rather strange in view of the fact that only 

 the female of the former had been described. 



Brachyopa flavescens vShannon. 



Thorax wholly reddish yellow (or brownish before the suture — 

 Johnson) ; abdomen with narrow posterior segmental margins brownish. 



Length, 3.75 to 6 mm. Female. Face, except below the antennae, 

 lower part of the front, and a slender median frontal stripe, shining 

 reddish yellow; front yellow pollinose, face with whitish pollen except 

 where shining. Occiput above darkish, with whitish pollen; face a 

 little more concave than in media. Thorax wholly reddish yellow, with 

 the usual stripes shining. Abdomen reddish yellow, the narrow 

 posterior margins of the segments brownish, their lateral margins 



