198 ERNEST A. BACK. 



pale testaceous; coxae with whitish pile, pulvilli testaceous; wings pale 

 cinereous, at the base broadly whitish. 



Third segment of antennae rather short, elongate oval, style less 

 than half as long. Fourth posterior cell sessile, the anal open within 

 (entr' ouvertes). Wholly tawny; the tips of the second and third 

 segment of antennae and the palpi black, the latter with whitish pile; 

 face black, front black, with light-brown pile; occiput with some 

 yellowish bristles, mystax and beard whitish. Thoracic dorsum with 

 two contiguous longitudinal stripes, attenuated behind and abbreviated 

 above the insertion of the wings, and on either side with a large oblong 

 black spot. Base of femora and pectus blackish, a little whitish pile 

 on each side, also on the abdominal segments, especially on the last; 

 hairs of the femora whitish; tarsi with some short whitish hairs, 

 pulvilli testaceous; halteres whitish. Wings of a very pale gray, the 

 basal half whitish, the costal and second longitudinal veins tawny. 



Type. — Bigot collection. 



Habitat. — California (type), Los Angeles Co., Cal. (Coquil- 

 lett) . 



The material of this species in the National Museum is in 

 very poor condition, so I have used the original description. 

 The hypopleura is bare and the sternopleura has only a very 

 small amount of pile, not arranged in a tuft. The wings are 

 very small, hardly reaching beyond the tip of the fourth seg- 

 ment. 



This species is very close to nigritidus, also from California, 

 both as regards general build, shape of wing and pile of pleurae. 



Stem>iK»ji;oii inquinatiis (PI. Ill, fig. 2). 



Stenopogon inqiunatus Loew, Cent., VII, 47, 1866. 



Stenopogon inquinatus Jones, Trans. Am. Ent. Soc, XXXIII, 



274, 1907 (locality note) . 

 Stenopogon inquinatus Howard, Insect Book, 1902; PI. XIX, 

 fig. 7. 

 ^ 9 • — Length 23-25 mm. — Third segment of antennae elongate, as 

 long, or longer, than the first two segments together, not excised 

 within on the distal half; style bristle-like, fully half as long as the 

 third segment. Head and thorax, except the humeri, black, very 

 thinly clothed with grayish bloom; abdomen except on sides, and legs 

 except femora above, yellowish-red. Hypopleurae bare, meso- and 

 sternopleurae with a very limited amount of fine short hair. 



Face and lower occiput densely grayish-white pruinose; front less 

 so; bloom of thorax, coxae and sides of abdomen very thin, not ob- 

 scuring the subpolished ground color. Palpi, basal segments of an- 



