ART. 4. REVISION OF THE FAMILY THEREVIDAE—COLE. 105 
THEREVA VANDUZEEI, new species. 
Plate 10, fig. 123; plate 11, fig. 1385; and plate 12, fig. 157. 
Male.—Length 9 mm. Head black in ground color, the upper 
corner of frontal triangle velvety black, the lower part of frons and 
the face silvery white pollinose and yellowish pilose, the pile not 
very long or dense. Cheeks and occiput white pollinose, the upper 
occiput yellowish pilose, the lower occiput and cheeks white pilose, 
a few black hairs at the lower corner of the eye. Antennae black, 
the first two joints gray pollinose and with black bristles, third 
joint slightly shorter than the first and distinctly narrower (fig. 135), 
the arista short. The ocellar tubercle is dull brownish black; bristles 
of the occiput black. 
Thorax black in ground color; dorsum light-gray pollinose, with 
three broad brown vittae, the central stripe narrowing and almost 
disappearing before the scutellum, the lateral stripes not reaching 
the front or rear of the dorsum; bristles of the thorax and the four 
bristles of the scutellum black. Mesonotum with golden-yellow 
reclinate pile, more erect in the anterior portion, the central part 
interspersed with erect black pile. Scutellum gray pol!linose and 
rather long erect yellow pilose. Pleura gray pollinose, with yellow- 
ish pile before the halteres and wings, the rest of the pile white. 
Halteres black, the knob somewhat grayish pollinose and showing a 
trace of yellow color at the tip. 
Abdomen black, densely gray pollinose and white pilose, the pile 
dense, reclinate, and silvery on the dorsum. Genitalia black, gray 
pollinose, largely white pilose, with some yellow hairs above and a 
few black hairs on the projections of the hypandrium. ‘The epiproct 
much larger than the lower plates of the genitalia. Femora black, 
gray pollinose and white pilose; front femora with one black bristle 
below near the middle, middle femora with two, the hind ones with 
five or six; tibiae yellowish with blackened tips; base of the first 
tarsal joint yellowish, the other joints black. Wings whitish hya- 
line with a black stigma, costa to wing tip and R-I yellow, the 
other veins black; cross veins and fork of Rs clouded blackish gray; 
cell M-3 narrowly open, first A closed in the margin; M-1 and M-2 
very close together at the base or actually touching, there being a 
good deal of individual variation in this character. (Wig. 157.) 
Female.—Length 10 mm. Very nearly like the male. The frons 
pale brown pollinose above, silvery white on the lower part, on each 
side near the middle a triangular velvet black spot, almost meeting 
in the center of the frons to form a band. Pile of head colored as in 
the male. Upper frons with a few black hairs mixed with the yellow. 
Bristles of antennae much shorter than in the male. Pile of the 
abdomen short, white, and reclinate on the first four segments, on 
