194 ERNEST A. BACK. 



lum and pleurae entirely pale except the hair on the obscure lateral 

 stripes, and the denser hair and bristles extending from the pronotum 

 to the base of the scutellum along the median stripe, which are wholly 

 black; the hair along the median stripe forming a crest. The sterno- 

 pleuras with a tuft of long soft pile, the trichostical pile or bristles 

 wholly wanting, thus leaving the hypopleurae bare. Abdomen black, 

 subshining through a very thin covering of gray bloom; all the seg- 

 ments above, beginning with the second, adorned with a reddish- 

 yellow longitudinal vitta; venter reddish; the last two segments of 

 the female polished black, each with a single reddish spot above; 

 hypopygium black, with black pile. The legs wholly pale pilose, the 

 black fasciae of the middle femora are on the proximal two-thirds. 

 The wings tinged with black or fuscous, the basal third, excepting the 

 costa, in the male, milky white, in the female as usual; the fourth 

 posterior cell closed or open; the first often considerably narrowed. 



Type.- — -M. C. Z. A male specimen. There is a female 

 homotype in the collection of the University of Kansas. 



Habitat. — California. 



The female homotype agrees perfectly with the male as 

 regards the extent of the reddish-yellow vitta of the abdo- 

 men. I believe, however, that this vitta will be found to be 

 variable. I have seen two other specimens from California 

 which I believe to be this species, in which the vitta broadened 

 out so as to cover nearly the entire tergum. 



Stenopogou californijie. 



Dasypogon californics Walker, List, II, 322, 1849. 

 f Stenopogon ohscuriventris Loew, Cent., X, 30, 1872. 



(^ 9- — Length 16-21 myn. — -Polished black of body more or less 

 obscured on thorax and female abdomen; pile and bristles of face, 

 occiput, posterior callosities, scutellum and legs varying from deep 

 fulvous to pale straw. Wings tinged with brown except the posterior 

 angles, which are milky white; female wings without, or with but 

 slight trace of milky white color. Basal two-thirds of the front and 

 middle, and the basal three-fourths of the hind femora black; rest of 

 legs wholly yellow. 



Face thinly clothed with very fine depressed golden pile, which in 

 certain lights has a silvery reflection; front and occiput yellowish 

 pruinose. Proboscis, palpi and antennae black. Third segment of 

 antennae slender, about one and one-quarter times the length of the 

 first two taken together; style prominent and one-third the length of 

 the third segment. The first two segments of the antennae, the palpi, 

 the facial gibbosity and the occiput densely clothed with pile and 

 bristles, varying from deep fulvous to pale yellow. W^eak bristles of 



