ART. 4, REVISION OF THE FAMILY THEREVIDAE—COLE. 75 
Head tawny above, white in front, hoary behind and beneath, where it is clothed 
with white hairs; there are a few black bristles behind the eyes, which are red; 
feelers gray; the first joint clothed with black hairs; chest dark brown, with two 
tawny stripes; the sides hoary; breast gray; abdomen black, shining, thinly clothed 
with short black hairs; there is a large triangular white spot on the hind border of 
each of the segments from the first to the third; the first is narrower than the other 
two spots, and the second is larger than the third, and they are all clothed with 
white hairs; legs gray; shanks tawny, feet piceous; wings. slightly gray; brands 
brown; veins piceous, very slightly bordered with brown; poisers dark ferruginous, 
their knobs piceous from the base to the middle, pale yellow thence to the tips. 
Length of the body 4 lines; of the wings 8 lines. 
a. Nova Scotia: From Lieutenant Redman’s collection. 
Type.—In the British Museum. 
Austin reports the type to be in fairly good condition and adds 
the following notes to the description: 
The abdominal spots are paired, and occupy the anterior and posterior angles of 
the second (visible) tergite and the posterior angles of the third; in the case of the 
first pair, each spot is more or less concealed by a long fringe of backwardly directed, 
silvery white hair on the hind margin of the preceding segment. Although Walker 
does not mention it, the fifth abdominal tergite bears a deep, whitish gray pollinose, 
transverse band, almost or narrowly interrupted in the middle line by a forwardly 
and a backwardly directed triangular indentation, formed by the shining black 
ground color. 
The writer obtained a copy of Kréber’s paper, Beitrage zur Kennt- 
nis der Thereviden und Omphraliden, published in 1914, after the 
type had been set up for this paper. There was no opportunity to 
place the species in this paper in relation to other species studied by 
the writer. The writer has not seen specimens of any of the eight 
new species of Psilocephala described from North America in this last 
paper by Kréber. ‘Translations of the original descriptions are given 
below. 
PSILOCEPHALA PALLIDA Kréber. 
1914, Psilocephala pallida Kro6peEr, Beiheft z. Jahrb. Hamb. Wiss. Anstalten, 
vol. 31, p. 45. 
The species is said to be very near marcida. 
Male.—Length 7.5mm. The head is silky brown, with indefinite 
blackish brown spots on the frons. The antennae are pale yellow, 
the third joint whitish, the style black. The occiput is dark brown 
above, pale gray below; the pile is white. 
The mesonotum is grayish brown with a greenish tinge, thin white 
pilose. The halteres are pale yellow. The abdomen is pale yellowish 
brown in ground color, with thick whitish pile above; the anal seg- 
ments are yellowish brown. The wings are somewhat yellowish, the 
stigma small, blackish brown; all the cross veins are thick, black, 
also the endings of the longitudinal veins; all of the posterior cells 
have blackish centers. 
Type locality One male, taken in Texas, June 19. 
Type.—In the United States National Museum, Cat. No. 26018. 
