arr. 4. REVISION OF THE FAMILY THEREVIDAE—COLE. 21 
PHEROCERA SIGNATIFRONS, new species. 
Plate 3, figs. 11, 12, and 13. 
Female.—Length 6 mm. General body color blackish brown, with 
eray or silvery pollinose areas. Frons much wider below than above, 
the upper half including the ocellar tubercle, gray pollinose; on the 
lower half of the frons an oval, shining, blackish brown spot, some- 
what raised and reaching almost to the eyes on the sides. (See fig. 13.) 
Face, cheeks, and orbits silvery pollinose, the cheeks and palpi white 
pilose; palpi brown; proboscis blackish gray pollinose. At the base 
of each antenna and contiguous to the shining callosity of the frons 
is an oval black spot. Antennae black, the bristles below black and 
strong; first antennal joint a little longer than the third and twice 
as long as the second; style rather slender, two-jointed, and with an 
apical bristle, the whole about as long as the third joint of the 
antennae. Occiput gray pollinose with short black bristles above. 
Thorax, scutellum, and pleura blackish, the color obscured by the 
gray pollen; there is a median brown dorsal stripe, widened in front 
and almost reaching the scutellum; an elongate brown spot on either 
side of the stripe. Scutellum with short, fine, white pile on the 
margin and two black bristles. Mesa and meta pleura with some 
white pile. Knobs of halteres blackish gray pollinose, the stem 
yellowish. Coxae colored as the pleura and with white pile. 
Abdomen blackish, with whitish incisures on segments one to five, 
very narrow on the fifth; the very fine pile is whitish and reclinate; 
first segment mostly gray pollinose and a small amount on the 
posterior margin of the second, the rest semishining. Genitalia very 
peculiar in shape and with very short black pile; there is an upper 
and lower triangular plate, flattened and with no circlet of bristles as 
in most of the other genera. Legs mostly blackish, the femora thinly 
gray pollinose and white pilose, with no distinct bristles; tibiae more 
or less yellowish on the basal half, the front pair whitish; all the 
tibiae white pilose, the front ones with quite a thick covering of 
silvery white pile, obscuring the ground color from the front. Wings 
rather small, grayish hyaline, the venation near that of Psilocephala 
(see fig. 12); vein M-2 does not reach the wing margin; vein M-3 
coalesces with Cu-1 and does not reach the margin. 
Type locality.—Holotype, female, Alamogordo, New Mexico, May 
5, 1902. 
Type.—In the Philadelphia Academy of Natural Sciences. 
There are four female paratypes in the collection of the Philadel- 
phia Academy of Natural Sciences, collected at the same time and 
place, and one paratype in the National Museum. This species and 
the following are in a group having no near relatives north of the 
Mexican border; its origin is probably Central or South American. 
