ART. 4, REVISION OF THE FAMILY THEREVIDAE—COLE, 73 
PSILOCEPHALA LATIFRONS, new species. 
Plate 6, fig. 61. 
Male.—Black, gray pollinose species. Frons bare, silvery gray 
pollinose, rather large, the eyes separated at the vertex by the width of 
the ocellar tubercle; ocellar tubercle with black pile. Antennae short, 
first joint as long as the third. rather heavy, it and the second joint 
gray pollinose; first and second joints with quite long pile and a 
few short black bristles on the outside and below. Cheeks with a 
dark spot on which there are some black hairs. Occiput gray 
pollinose and white pilose, the post-ocular bristles black. 
Dorsum of thorax blackish gray, with two widely separated vittae 
and the lateral margins whitish gray; pile of thorax erect, white. 
Pleura black, gray pollinose and white pilose. Scutellum gray 
pollinose, white pilose, with four marginal bristles. Halteres blackish, 
the knob thinly gray pollinose. 
Abdomen black, densely gray pollinose, silvery on the dorsum, the 
thick reclinate pile silvery white. All the abdominal pile white. 
Genitalia small, black, the upper portion larger than the hypandrium 
and gray pollinose; a few black hairs on the hypandrium. Abdomen 
quite long; with seven distinct segments before the genitalia. Fem- 
ora, and tarsi except bases, tibiae except tips, black; bases of tarsi and 
basal portion of tibiae reddish brown; pile of femora white. Wings 
hyaline, the veins brown, stigma dark brown; cell M—3 wide open. 
Type locality—Holotype, a male, collected at West Danby, New 
York, May 30, 1915. 
Type.—In the Cornell University collection. 
Distribution.—The distribution according to the six males exam- 
ined is: 
Canada: County Prince Edward, Ontario, May 24 (Evans), [Canad. 
coll.]. 
New York: The type specimen. 
New Jersey: Camden, May 4 (M. C. Van Duzee), [Van Duzee]; 
Toms River, May 30 [C. W. Johnson]. 
Pennsylvania: Allegheny County [Carnegie Mus.]; Conewago, April 
16 [Harrisb. coll.]. 
All specimens (five) other than the type are paratypes. 
Maj. E. E. Austen, of the British Museum, has kindly examined 
the types of Walker’s six species of North American Therevidae and 
finds that three of them belong to the genus Psilocephala. Although 
it is not possible to tell with certainty what the species are until 
all the described species are better known, I have thought it best 
to include Walker’s descriptions, as the species will some day be 
worked out. 
