ART. 4, REVISION OF THE FAMILY THEREVIDAE—-COLE. 65 
Distribution.—The two males examined were from the following 
localities: California—San Diego County (Harkins), [Stanford U.]; 
San Gabriel Mountains, southern California, June 5 (N. Banks), 
[M. C. Z.] 
PSILOCEPHALA CINEREA, new species. 
Plate 6, fig. 60; plate 7, fig. 72; and plate 8, fig. 95. 
Male.—Length 6.5mm. General ground color black, the abdomen 
with silvery white pile. Head black, the occiput and cheeks with 
considerable white pile; bristles of occiput black. Frons mostly 
white pollinose, the upper corner of the triangle dull black, with 
some black and white pile. Antennae short, black, the first joint 
slightly shorter than the third, with white pile above at the base and 
several black bristles. (Fig. 95.) Palpi yellow, with white pile. 
Thorax black, gray pollinose, with reclinate white pile and longer 
erect black pile; two pairs of praescutellar bristles. Scutellum gray 
pollinose and white pilose, with four bristles. Pleura gray pollinose, 
the meta and mesa pleura long white pilose. Coxae gray pollinose 
and white pilose. Halteres mostly brownish yellow, base of knob 
blackish, the outer part whitish pollinose. 
Abdomen black, gray pollinose, thickly clothed with silvery white 
pile. Genitalia largely yellowish, the upper lamellae large, with 
slender, pointed projections. Tibiae except apices and basal half of 
metatarsi yellowish, the rest of the legs blackish brown; femora 
with reclinate white pile; bristles of the legs black. Wings hyaline, 
veins pale, stigma yellowish; anal cell closed before the wing margin 
and cell M-3 closed in the margin. (Fig. 72.) 
Female.—Length 7 mm. Much like the male. Face and lower 
,; art of frons white pollinose, upper frons dark gray pollinose, a dull 
black irregular crossband between the colors, which merges into a 
semicircular black spot on the eye margin. (Fig. 60.) Two rows 
of strong black bristles on the occiput, not obscured by pile as in 
the male. Black pile of thorax short and sparse, the reclinate pile 
also short and yellowish. Two narrow pale stripes on thorax. 
Abdomen black, the first segment and venter gray pollinose; second 
segment with white posterior border; posterior margins of second, 
third, fourth, and most of fifth and sixth gray pollinose. Pile of 
basal half of abdomen white and black, all white on first segment; 
on the apical half of abdomen short black erect pilose. Wings as 
in the male; cell M—3 very narrowly open in the margin. 
Type locality —Holotype, a male, and allotype, a female, collected 
at Alamogordo, New Mexico, April 30 and May 30, 1902. 
Types.—In the Academy of Natural Sciences, Philadelphia. 
