108 PROC. ENT. SOC. WASH., VOL. 23, NO. 5, MAY, 1921 



studied these specimens I find it necessary to make two correc- 

 tions to my first paper and add the description of the male 

 antennae. 



Female. Resembles the male. Front sub-shining, yellowish red, paler 

 towards the antennae. Ocellar triangle shining black. Antennae short, pale 

 yellow. First joint very short with a row of black bristles along the apical edge; 

 second joint twice the length of the first with numerous black bristles on the 

 outside reaching up to upper inner surface; bristles much longer on lower front 

 edge; one large bristle on upper, apical edge; inner surface covered with numerous 

 short, yellow hairs; third joint rounded apically, slightly infuscated and covered 

 with short yellow pubescence; one and one half times longer than wide. Arista 

 long, black, slightly thickened and reddish yellow at the base; located on dorsal 

 basal third of third joint. Face short, broad, white, with the white extending 

 upon the sides slightly above and below the base of antennae. Numerous, short 

 black bristly hairs along the lower, lateral edge of the head. Dorsum of thorax 

 and pleura shining yellowish red; dorsum of thorax clothed with numerous short, 

 black, bristly hairs; in certain lights the middle and sides are narrowly blackish. 

 Two pairs of dorso centrals. Scutellum yellowish red; two pairs of long bristles. 

 Two sternopleurals, the front one sometimes quite weak and hair like. Abdo- 

 men shining black; five segments visible, the sixth very narrowly visible; first 

 segment longer than any of the following segments, reddish at the base; second 

 to fifth about equal in length; dorsum of abdomen with numerous short, black 

 hairs and a very narrow, median, bare line or area. Fifth segment with one 

 large bristle on each side at the apex. Venter with numerous short, bristly 

 hairs. Front coxae long, robust, white pollinose; middle and hind coxae more 

 normal and reddish yellow. Legs more normal, reddish yellow except the apical 

 half of the front femora, tips of front and hind tibiae and front tarsi blackish 

 brown; middle and hind tarsi with a brown infuscation. Length of front meta- 

 tarsus equal to the remaining four joints; middle and hind metatarsi a little 

 longer than the following four joints. Wings hyaline, a brownish infuscation 

 along the costal edge; veins brown; yellowish at base of the wing. Halteres 

 reddish brown at the base, knobs large, lemon yellow. 



Length, 5 mm. 



One specimen from Mt. Moscow, Idaho, July 25, 1920, R. C. 

 Shannon, collector. Deposited in the collection of U. S. 

 National Museum. 



The male antennae are very much like those described for the 

 above female with the following differences: Bristles on apical 

 edge of first joint more yellowish; second joint with fewer black 

 bristles on the outside surface and very few yellow hairs on 

 inner surface; the bristle on upper, apical edge larger and located 

 more towards the inside; third joint more rounded, whitish 

 yellow and no infuscation. Arista same but paler at the base. 

 The thorax may be variable from reddish to nearly black; pleura 

 is generally darker than the dorsum. Two pairs of dorso cen- 

 trals. In the type the front pair was so weak that I mistook 



