art. 4. REVISION OF THE FAMILY THEREVIDAE—COLE. 125 
Female.—Length 10 mm. Closely resembles the male. In the 
specimen described the third antennal joint is yellowish. Frons dis- 
tinctly convex, the heart-shaped shining callosity reaching to the 
ocellar tubercle, a few black pile just below it and on the vertex, the 
rest of the pile of the frons and face yellow. Frons yellow pollinose, 
the face grayish white. Except for the black tuft below the eye, the 
pile of the cheeks and lower occiput white, that on the upper occiput 
yellow; bristles of the occiput black. 
Pile of thorax shorter than in the male, the lateral vittae pale brown 
and more indistinct; pile of the lateral margins of the mesonotum 
golden yellow. First abdominal segment almost entirely yellow, all 
the other segments with black anterior margins, the pile on the black 
portions black, on the yellow portions of the first two segments yellow; 
the rest of the abdominal pile black and longer than usual. Most of 
the coxae and femora, tibiae except the apices, base of the first two 
tarsal joints yellowish, the last tarsal joints brown. The portions of 
the wing whitish in the male are grayish hyaline or with a yellowish 
tinge, the costal cell gray. 
Type locality —Mountains near Claremont and at Claremont, Cali- 
fornia (C. F. Baker). 
Type.—Male, No. 25945, U.S.N.M.; allotype, female, same. 
Specumens examined.—Three males, one female. 
Paratypes.—There are two paratypes, one was collected at Hast 
Highlands, San Bernardino County, California, September 14 (F. R. 
Cole), [Cole]; the other specimen was taken in Santa Clara County, 
California (Harkins), [Stanford Univ.]. 
THEREVA FLAVIPILOSA, new species. 
Plate 11, fig. 136. 
Male.—Length 8.5mm. Head black, the face, frons, and occiput 
whitish pollinose. Pile of vertex, top of frons, and outer margin of 
face black, the rest of the pile of the head deep yellow. Antennae 
small, black, the third joint about the length of the first, with the tip 
expanded (Fig. 136.) Pile of the head very dense. 
Thorax, pleura, and scutellum black, thickly covered with erect 
yellow pile; mesonotum and scutellum shining; scutellum with a 
yellow pollinose border; two well-defined, widely separated yellow 
vittae on the mesonotum. Knobs of halteres brown, the stem yellow. 
Abdomen black, some black pile on the dorsum of all the segments, 
including the genitalia, the larger part of the pile long and yellow; 
posterior margins of segments two to six yellow, yellowish pollinose, 
the color expanding and more shining on the sides. Upper lamellae 
of genitalia brown, the hypandrium brown at base, otherwise reddish 
