118 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62, 
Pile of pleura and pectus yellowish. Stem of halteres yellowish, the 
knob brown. 
Abdomen black, with posterior margins of second, third, and fourth 
segments very narrowly yellow above and more broadly on the ven- 
ter, which is entirely gray pollinose. Sides and posterior borders of 
segments gray pollinose; first tergite with a small central portion 
colored brown; second, third, and fourth segments largely semishin- 
ing blackish brown, also the basal half of the fifth and sixth; seventh 
segment shining black; genitalia black with a reddish tinge, the 
terminal circlet of spines reddish; a few black hairs on the genital 
segment, all the rest of the abdominal pile yellowish. Femora black, 
gray pollinose, sparsely yellowish pilose; bristles of legs black; tibiae 
except tips and base of tarsi yellowish, the rest of the legs black. 
Base of the wing yellowish, the costal margin, tip, and posterior 
margin infuscated; brown clouds on the cross veins, and a brownish 
gray margin to most of the veins, the centers of the cells whitish; 
cell M-3 closed near margin; veins blackish brown toward the pos- 
terior margin of the wing. 
Type locality — Rio Cennde River, New Mexico (Oslar), [from the 
collection of W. G. Dietz]. 
Type.—Female, No. 25943, U.S.N.M. 
Paratypes.—There is a paratype in the same collection from the 
arroyo Pecos River, New Mexico. 
A male in the same lot of material may prove to be this species; 
the specimen was taken at Chimney Gulch, Colorado, near Golden. 
The wings are the same as in the above species and there are several 
other characters in common, but, as it is not a good specimen, it is 
better not described. The eyes are separated by the width of the 
ocellar tubercle, but perhaps this is an individual abnormality. 
THEREVA STRIGIPES Loew. 
1869. Thereva strigipes Loew, Berlin. Ent. Zeitschr., vol. 13, p. 169. 
Loew described only the female of this species. 
Type locality—Lake Winnipeg, Canada. 
Type.—tIn the Museum of Comparative Zoology at Cambridge. 
Distribution.—Krober redescribed the species in his paper on the 
Therevidae of North America, giving the region around Lake Winni- 
peg and Colorado as the habitat. The species has been recorded from 
Axton, New York (O. A. Johannsen), and White Mountains, New 
Hampshire (Mrs. Slosson). One female.in the National Museum col- 
lection, taken at Center Harbor, New Hampshire (H. G. Dyar), may 
belong here. C. W. Johnson kindly loaned a male and female 
for study, from which the following notes are made: 
Male.—Length 10 mm. The specimen is evidently teneral and the 
thorax slightly greased. Frons and face grayish white pollinose, the 
