226 Annals Entomological Society of America [Vol. X, 



inner angles acute; segments three, fotir and five each with a quadrate, 

 interrupted transverse cross-band on the anterior portion, which reach 

 the lateral margins in their full width, their inner angles slightly rounded; 

 segments four and five narrowly margined, posteriorly, with yellow; 

 legs brownish-yellow; four anterior femora with a brownish band near 

 the middle; tibiae and tarsi yellowish; hind tibia?, tarsi, and femora, 

 except at the bases and extreme apices, brownish; wings hyaline, 

 stigma yellowish. 



Habitat: One 9, Happy Hollow, Colorado. C. S. Mead, 

 Collector. August 18, 1913. 



Brachyopa rufiabdominalis n. sp. 



Length, 7 mm. Face light reddish brown, prominently produced 

 forward, with light, silvery, glistening pollen and very fine white 

 pubescence; slightly concave beneath the antennje; frontal triangle 

 shining, prominent, with or without a median suture. Cheeks a little 

 darker red than the face and with a shining stripe from the eye to the 

 oral margin; sparsely covered with long white pile. Antennae situated 

 on a semi-conical projection, of the same general color as the face but 

 slightly darker; first joint about half as long as the second, of a slightly 

 deeper red than the third, dorsally with a tuft of black hairs on each, 

 third joint light red, about as long as first and second together, ovate; 

 arista bare, dorso-basal. Vertex black, frontal portion with or without 

 silvery pollen, eyes narrowly separated. Dorsum of thorax brown with 

 black pile, covered with grayish pollen, anteriorh' with two approximate 

 dorso-medial blackish stripes, laterally, with a broad interrupted stripe; 

 the transverse suture deep, shining; humeri with a reddish spot; pleurae 

 reddish brown; a reddish brown stripe extending from the scutellum to 

 the base of the wing. Scutellum light reddish brown, beset with blackish 

 and reddish pile, shining, with a very narrow median light stripe; 

 abdomen slightly longer than the thorax, but little longer than wide, 

 light reddish brown and entirely shining, with reddish pile ; the posterior 

 portion of segments one, two and three with a narrow, posterior, shining, 

 bro\\'nish, transverse band, either entire or interrupted in the middle. 



Legs of the same color as the abdomen, principally with light colored 

 pile ; on the under side of the hind femora and the apex of the four middle 

 femora with stout black pile ; tarsi darker brown ; light at apex ; the hind 

 metatarsi slightly thickened at base and thence gradually tapering to 

 apex; wings hyaline with a reddish tinge, anterior cross-vein before the 

 middle of the discal cell and almost rectangular. 



Habitat: Two male specimens. C. R. Jones, Collector. 

 Rist Canon, Colorado, on wild plum. May 12, 1915. 



B. rufiabdominalis differs from B. cynops in that the scutellum 

 and abdomen are entirely shining, in that, in the former, the 

 circular abdominal and the triangular spots of segments two 

 and three are wanting, and it has the narrow posterior cross- 

 band, and the lengths are different; in that the hind femora and 



