aRr. 4. REVISION OF THE FAMILY THEREVIDAE—COLE. 61 
and brown. Antennae of about the same structure as in the male, 
the first two joints gray pollinose, with a few short yellow pile. 
From the antennae to the eye margin a dark-gray stripe as in Dia- 
lineura, species. Pile of the cheeks and occiput white. 
Thorax with a broad, dark-gray median vitta, narrowed consider- 
ably toward the scutellum; on either side of the median stripe an 
elongate spot of the same color. Scutellum gray pollinose, with 
four marginal black bristles. Pile of the mesonotum and scutellum 
short, reclinate, yellowish. Pleura grayish white pollinose, some 
yellow pile above, the most of the pile white. 
Abdomen on the first six segments largely whitish gray pollinose, 
a dull brown mark at the base of second and third, the base of the 
fourth very narrowly brown. Pile of the first three segments whit- 
ish, short, erect, and black on the other segments. The circlet of 
spines at the tip of the abdomen black. Wings and legs as in the 
male. Cell M-3 may be narrowly or broadly open in the margin of 
the wing. 
Neallotype.—I have selected as a neallotype a female specimen 
collected at Fort Erie, Ontario, Canada, July 4, 1910 (M.C. Van 
Duzee), [Van Duzee]. 
A larger specimen was taken at Ridgeway, Ontario, June 18, 1911 
by Mr. Van Duzce and _ s in the collection with the type. This spec- 
imen is more or less greased, and the markings not clear. In one 
wing of this specimen the cell M-3 is closed in the margin, in the 
other wing narrowly open. <A specimen loaned by Mr. C. W. Johnson 
was collected at Oswego, New York, June 16, 1896, and is somewhat 
ereased and faded, but typical of the species. The male specimen 
examined was taken at Ridgeway, Ontario, Canada, July 7, 1912 (M. 
C. Van Duzee), [Van Duzee]. 
PSILOCEPHALA VARIEGATA OCCIDENTALIS, new subspecies. 
Plate 7, fig. 78, and plate 8, fig. 102. 
Length 8mm. Three male specimens collected in Oregon differ 
slightly from the typical form. The female of this form is not known. 
The male genitalia are externally of the same structure as in variegata, 
but the pile is black instead of yellow. Pile of the antennae and the 
post-ocular bristles black. Pile of head, thorax, coxae, femora, and 
abdomen rather short and silvery white. The scutellum has silvery 
pile and four black marginal bristles. The wing membrane is more 
gray than whitish. 
Type locality.—Corvallis, Oregon, June 4,1897 (collector unknown). 
Type.—Male, in the California Academy of Sciences. 
Two male paratypes were examined, both taken by the writer at 
Hood River, Oregon, May 5, 1918; one of these is deposited in the 
National Museum (Cat. No. 25941). 
