96 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
lum like the thorax. Pleura weak gray pollinose, sparse white pilose. Abdomen 
thickly white pilose without noticeable silvery shine. Second to fourth segments 
with white posterior borders. Anal segment spherical, prominent, black, shining. 
Venter through pollen whitish gray, with white pile and pure white borders on seg- 
ments two to four. Femora black, through pollen and white pile appearing gray. 
Tibiae light yellowish brown, with darkened tips. Tarsi black, with yellowish brown 
base. Wings whitish, not hyaline, with strong, dark-brown veins and blackish brown 
stigma. The fourth posterior cell is closed. Length 8.5 mm. 
Type.—In Krober’s collection. 
Type locality —California. 
THEREVA CANDIDATA Loew. 
Plate 10, fig. 130, and plate 11, fig. 149. 
1869. Thereva candidata Loew, Berl. Ent. Zeitschr., vol. 13, p. 8. 
Male——Length 8.5 mm. Head black, white pollinose and with 
white pile on the lower frontal triangle, face, cheeks, and occiput; 
post-ocular bristles black. Mouth parts brown with white pile. First 
joint of antennae and base of second black, gray dusted, the first 
with black bristies near the apex and white pile; third joint yellowish, 
darker at the base, the arista black. 
Thorax black, gray pollinose, the mesonotum dark gray, with two 
whitish vittae, broad anteriorly and posteriorly; the lateral margins 
of mesonotum light gray; pile of mesonotum erect, whitish, the bristles 
black. Scutellum gray pollinose, darker at the base, with long erect 
white pile and four black marginal bristles. Pleura and coxae silvery 
white pollinose and white pilose. Stem of halteres yellowish brown, 
base of the knob black, the rest yellow. 
Abdomen black, dense gray and white pollinose, with white pile, 
dense and reclinate on the dorsum; base of second, third, and fourth 
segments with a round black spot near the middle. The hypopygium 
largely black, white pollinose and pilose, the outer margin of the 
upper forceps yellow, the hypandrium small. (Fig. 149.) Femora 
black, the tips broadly yellow, pile white; tibiae yellow, the extreme 
apices darkened; the last two tarsal joints blackish brown, the rest 
yellow with brown apices. Bristles of the legs black. Wings hyaline, 
all the veins yellow, the stigma pale yellow; ceil M-3 usually wide 
open. 
Female.—Length 10mm. Darker than the male asarule. Upper 
two-thirds of frons golden brown pollinose, the lower third silvery 
white; on each eye margin near the junction of the two colors a semi-~ 
circular brown spot, visible only in certain lights (fig. 130); upper 
part of frons with short black pile, pile on the lower part and the face 
silvery white. Antennae black, the first joint and base of the second 
gray pollinose. Scutellum with short yellow pile. Mesonotum with 
short erect blackish pile and reclinate whitish pile. 
