ART. 4, REVISION OF THE FAMILY THEREVIDAE—COLE. 107 
Abdomen gray pollinose with a yellowish tinge to the pollen; 
second and third segments with a white posterior margin. Pile of 
the abdomen almost wholly white, reclinate on the dorsum, yellowish 
on the basal portion of the second to the fifth. The base of the 
second to the fifth segments narrowly blackish brown, with a dark 
median triangle projecting from it on which the pile is black and 
short. The external genitalia are without distinctive structure, 
blackish brown in color, with whitish pile; the hypandrium small 
and with scarcely any projections. Most of the tibiae and base of the 
first and second tarsal joints yellowish; femora, tips of tibiae, and 
most of tarsi blackish. Legs white pilose, the minute pile or setulae 
on the tibiae and tarsi white. Most of the bristles of the legs black, 
but there are a few yellowish bristles on the tibiae. Wings whitish, 
the veins on the basal portion yellowish, beyond blackish brown; 
cell M-3 closed and petiolate; stigma brown; the wings with several 
blackish gray spots in addition to those on the cross veins and the 
spot on the fork of R-4 and R-5. (Fig. 160.) 
Type locality —Alameda, California. 
Type.—In the United States National Museum, Cat. No. 25946. 
Although closely allied to vanduzeer the antennae are of somewhat 
different structure, and there are other characters which make it a 
very distinct species. The entirely white setulae of the legs is an un- 
usual character. 
This species was first described as new by the writer, the change 
being made in galley proof after seeing Kréber’s 1914 paper. 
THEREVA JOHNSONI Coguillett. 
Plate 10, fig. 119, and plate 11, fig. 142. 
1893. Thereva johnsoni CoQuiLLETT, Can. Ent., vol. 25, p. 200. 
Coquillett’s description of the female will serve to identify it. 
Type locality—Washington (O. B. Johnson). 
The type was probably returned to Professor Johnson, as it is not 
in the National Museum and was not recorded in the type book 
when other species in the same article were. This specimen may be 
in the University of Washington now. 
The male is very nearly like the female and is described below: 
Male.—Length 11 mm. Pile of the body considerably longer than 
in the female. Pile on upper frontal triangle long, black, on the 
lower frons and face dense, yellowish, very long on the face. Black 
pile of frons reaches almost to cheeks on the sides. Pollen golden 
yellow on the frontal triangle, yellowish on the face, golden above 
on the occiput, yellowish gray below. Post-ocular bristles black and 
slender. 
