Ant. 4. REVISION OF THE FAMILY THEREVIDAE—-COLE. BH. 
black, the femora with silvery white pile, short and reclinate on the 
hind pair, on the front femora longer, more erect, and reaching only 
two-thirds of the way to the tip. Wings hyaline, the veins and 
stigma black; cell M—3 wide open. 
Type locality — Holotype, a male, bred out at Rockviile, Penn- 
sylvania, May 30, 1919 (A. B. Champlain). 
Type.—in the Harrisburg collection, Pennsylvania Department of 
Agriculture. 
This species may prove to be the same as melampodia Loew, of 
which the male is not known. The antennae are about the same as 
in melampodia and the legs and wings are alike. 
Larva.—Length 26 mm. ‘The larva of this species does not have 
the rows of indentations characteristic of P. frontalis and P. haemor- 
rhoidalis. On the dorsum of the penultimate segment there is a 
group of four small hairs in the form of a square; on the venter two 
small hairs near the apex of the penultimate segment. The internal 
prolongation of the mouth parts can be seen through the semitrans- 
parent chitin. There is a large spiracle on the thorax as in the other 
known species of the genus. A single slender spine on each side of 
the three thoracic segments and a single spine on each side of the head. 
Pupa.—About 14 mm. in length. Pale brownish in color. The 
thorns on top of the head are shorter than in P. frontalis and those 
at the base of the wing are smaller in proportion. The thorax is 
large and quite convex above. (Fig. 174.) The dorsum of the first 
abdominal segment has 6 bristles above, and there are 8 on the sixth 
and seventh segments; on the other segments the number of spines 
varies from 10 to 12. The venter of segments 2 to 6 has six spines, 
three on each side. The last segment ends in a bifid spine. 
PSILOCEPHALA GRANDIS Johnson. 
1902. Pstlocephala grandis JouNsON, Can. Ent., vol. 34, p. 24, female. 
This form is very near P. canadensis, the following species, but is 
larger and has the frons marked differently. No other specimens of 
this species have been reported since the discovery of the unique type. 
Type locality—Rouville County, Province of Quebec, Canada. 
Type.—In the collection of C. W. Johnson. 
PSILOCEPHALA CANADENSIS, new species, 
Plate 6, fig. 53. 
Female.—Length 10 to 12 mm. A species very nearly answering 
the description of grandis Johnson, but smaller and lacking the 
diverging black lines on the frons (fig. 53); the upper two-thirds of 
the frons is dull-brown pollinose, in rubbed specimens showing dull 
black in the middle; this upper, narrower portion of the frons has 
numerous short black hairs. The antennae are short, nearly as in 
