154 Psyche [October 
shining black, with black pile. Legs black, tips of the tibiz and 
all of the tarsi reddish brown, the upper side of the hind meta- 
tarsi black, front and middle femora fringed below with long yel- 
low hairs, posterior tibia strongly curved, under side of the hind 
tarsi with yellow tomentum. Halteres light brown. Wings hya- 
line, all the veins margined with brown, most prominent on the 
cross-vein, stigma yellow, squamze brown, fringed with brownish 
hairs. Length, 16 mm. 
The female has the front about one-fifth the width of the head, 
dusted with brown and with brownish hairs, face yellowish pol- 
linose with a wide facial stripe. 
One male and six females collected by the writer at Jaffrey, 
N. H., June 15 and 18, 1917, on the flowers of the choke cherry. 
One female, Dartmouth, Mass., April 25, 1916 (N. S. Easton). 
Holotype, allotype and four paratypes in the collection of the 
Boston Society of Natural History. One paratype in the Museum 
of Comparative Zodlogy and one in the author’s collection. In 
one of the specimens from Jaffrey and the one from Dartmouth, 
Mass., the band of black hairs on the thorax is absent, while in 
some of the others it is less prominent than in the holotype. The 
series vary in size from 12-16 mm. 
The species is readily separated from C. verbosa Walker, in hav- 
ing the tibie black and in the absence of yellow pile on the abdo- 
men beyond the second segment. The Jaffrey specimens would 
indicate that it appears later in the season than C. verbosa. My 
records for the appearance of the latter range from March 13 to 
April 20. It seems to be more closely related to C. nigriventris 
Walton, from which it is separated by the yellow pile on the abdo- 
men. 
