ant. 4. REVISION OF THE FAMILY THEREVIDAE—COLE. 123 
Colorado: Gunnison (C. F. Baker), [Stanford Univ.]. 
Montana: Dillon, July 8, on alfalfa [Mont. Exp. Sta.]. 
Washington: Wapato, May 11 (Cole), [Cole]; Yakima River, Nel- 
son’s, July 4, 1882 [M. C. Z.]. 
Utah: Brigham, July 4 (J. M. Aldrich), [U.S.N.M.]; allotype above 
mentioned. 
-The specimen from Yakima River has the first antennal joint yel- 
low and is 10 mm. long. The Montana specimen is 11.5 mm. in 
length, with yellow femora and first antennal joint; the last four 
abdominal segments almost entirely yellow. The male collected at 
Wapato, Washington, has paler wings, whitish hyaline in spots; first 
antennal joint yellowish; a few black hairs on the sides of the face, 
the other pile dense-golden yellow. 
THEREVA FUCATA Loew. 
Plate 11, fig. 154, and plate 12, fig. 162. 
1872. Thereva fucata Loew, Berlin. Ent. Zeit., vol. 16, p. 74. 
This species has the first two antennal joints and base of third 
yellowish. The legs of the female are wholly yellow, largely so in 
the male. The thorax is shining black, with ochraceous pollinose 
vittae and lateral margins. The type, collected in California by 
Kdwards, is in the Museum of Comparative Zoology at Cambridge, 
Massachusetts. 
There are several closely related forms which might answer the 
description of this species; those seen by the writer are western in 
their distribution and are possibly all the same variable species or 
subspecies of the typical form. The wing of one type is shown in 
figure 162 and the male hypopygium in figure 154. Dissections of 
the male genitalia may reveal specific differences, but material is not 
available at present. 
Loew describes the wings as having three unequal brown fascia, 
arcuate, and abbreviated anteriorly; only six specimens of this typi- 
cal form were examined, one from Utah and five from California. 
Some specimens have less clouding in the wings than is shown in 
figure 162. A male from Little Bear Valley, California, has some 
differences in color and may prove to be a good species. 
Distribution.—Distribution according to 6 males and 16 females is 
as follows: 
Canada: Savary Island, British Columbia, August 23 (R. S. Sher- 
man); Hope Mountains, British Columbia, July 27 (R. S. Sherman), 
[both R, S. Sherman]; Lillooet, British Columbia, September 8 (R. 
C. Treherne), [Cole]. 
Wyoming: Mountains near Sheridan (Wm. Metz), [Pomona Col- 
lege]. 
