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

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



Dioctria piisio. 



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 tibias 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 tibias 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 

 coxae are yellow, the tip of the hind tibias 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. 



