arr. 4. REVISION OF THE FAMILY THEREVIDAE—COLE. 49 
a silvery gray pollinose spot on sides of fifth segment. Base of 
abdomen with a few whitish pile, the rest of abdominal pile short 
and black. First two tergites thinly gray pollinose, posterior margin 
of the second white, the rest of venter shining black. Front legs 
black except reddish color at base of tibiae; all femora black, the 
four hind tibiae and metatarsi reddish yellow with blackish tips, 
second tarsal joint yellow basally, the last three joints blackish. 
Wings faintly infuscated and with a yellowish tinge, the apex and 
margins of veins in apical half of wing darker (fig. 76); stigma 
brown; a hyaline spot at base of cell R-1 and subcostal cell; wing 
veins brown, yellowish toward the base. 
Male.—Length 7mm. Smaller than female and with more gray 
pollen on the body. Frontal triangle shining black, narrowly silvery 
on the sides, with numerous black hairs, in some specimens as long 
as the first antennal joint. 
Thorax and scutellum entirely gray pollinose, thinly so on the 
sides of mesonotum so that the shining black shows through; pile 
rather long, erect, whitish, and pale brownish. Pteropleura semi- 
shinning, the other pleura densely gray pollinose. Halteres blackish 
brown, the knobs large. 
Dorsum of abdomen densely silvery pollinose, reclinate white 
pilose above, longer and erect on the sides and venter; the sides of 
segments two to five shinning black at the base; venter on first 
three segments gray pollinose, the base of second shining, fourth to 
seventh semishining, thinly pollinose; sixth segment about four-fifths 
as long as the fifth, the seventh very short, it and the genitalia 
rather long black pilose. The genitalia has some short yellowish 
pile, is reddish in color, and covered largely by last segments of 
abdomen. 
Type locality.—Texas. 
Type.—In the Museum of Comparative Zoology at Cambridge, 
Massachusetts. 
Distribution.—The distribution according to 12 males and 10 
females examined is: 
Pennsylvania: North Mountain, June 8 [C. W. Johnson]. 
Kansas: Morton County (F. H. Snow), [Kans. U.]. 
Texas: El Paso, July 23 (J. C. Bradley), [Cole]. 
Colorado: Fort Collins, August 3 [C. W. Johnson]; Denver, July 
26 (EK. C. Jackson), [Biol. Surv.]; a series with no other data, deter- 
minded by Kroéber as haemorrhoidalis [U.S.N.M.]; Boulder, June 21 
(T. D. A. Cockerell); Rocky Ford, August 28, “bred with Lozostege”’ 
[both Cole]. 
Arizona: Tuscon (F. H. Snow); Douglas, August (Ff. H. Snow), 
[both Kans. U.]. 
