254 ERNEST A. BACK. 



of face very sparse, extending to base of antennae. First two segments 

 of antennae subequal in length; the third segment as long as the first 

 two taken together; style one-sixth as long as the third segment 

 thick, blunt. Pile of thorax rather abundant, that of abdomen very 

 sparse, short, bright yellow. 



Type. — U. S. N. M., Cat. No. 925. Two male specimens. 

 Habitat. — Los Angeles Co., Cal. (D. W. Coquillett). 



Dioctria pusio. 



Dioctria pusio Osten Sacken, West. Dipt., 288, 1877. 



Dioctria pusio Williston, Trans. Am. Ent. Soc, XIII, 288, 1886. 



" 9- — Length 4.2 mm.— Thorax and abdomen black; segments 3-5 

 of the latter dull reddish; legs yellowish-red; hind tibiae dark brown, 

 except the tip. 



"Antennae long, black, inserted on a small protuberance; third seg- 

 ment (without the style) as long as the first two taken together; the 

 style not quite half as long as the segment with a small expansion at 

 the base (somewhat like Meigen, tab. 19, fig. 20, only the style in com- 

 parison with the segment, is longer in D. pusio); face with a bloom, 

 which is golden yellow above, silvery below; mystax of a few whitish 

 hairs; front and occiput black; posterior orbits and two spots above 

 the neck on the occiput silvery pruinose. Thorax black, polished; 

 dorsum with three faintly indicated lines of microscopic pubescence; 

 the lateral ones expanded into triangles anteriorly; pleurae with several 

 spots with a partly silvery, partly golden reflection. Knob of halteres 

 lemon-yellow. Legs red, including the coxae; hind tibiae dark brown, 

 except the tip, which is red and somewhat incrassate; first segment 

 of hind tarsi large and stout. Abdomen black, polished, smooth; 

 second segment with a greenish reflection; the three following seg- 

 ments are reddish, but with darker metallic reflections. Wings with 

 a rather uniform, slight brownish tinge; anal cell open; veins brown, 

 yellowish at base; venation normal." 



Type. — M. C. Z. A single female in good condition. 



Habitat. — Sonoma Co., Cal. (July 4, Osten Sacken) ; Colorado 

 (S. W. Williston). 



Dr. Williston says of the Colorado specimen, a male, that the 

 coxas are yellow, the tip of the hind tibiae considerably incras- 

 sate, and the slender abdomen has the third and following 

 segments broadly blue-black on the disk of each, the margins 

 yellowish-red, the seventh almost wholly, the hypopygium 

 entirely so. The four fore tarsi are also brownish, except the 

 base. 



