142 INSECUTOR INSCITL^ MENSTRUUE 
brown dots surrounding the bases of the numerous long pale 
hairs; scutum blue-gray; scutellum and postnotum gray with 
a narrow dark brown median line. Pleura dark blue-gray, the 
dorso-pleural membranes dark brown ; sternites a little more 
brownish. Halteres pale at the base, the stem brown, the 
knob darker. Legs with the coxae dark, blue-gray pruinose; 
trochanters dark colored with a sparse blue-gray bloom ; femora 
deep brownish yellow passing into dark brown on the apical 
third; tibiae and tarsi dark brownish black. Wings light gray, 
the costal area brownish yellow, the membrane of the disk 
with dark brown and subhyaline blotches, arranged as follows : 
dark brown at the stigma, along the cord, along vein Cu and 
at the base of Rs; subhyaline blotches near the base of cells 
M, Cu and ist A ; near the tip of cell M, most of cell R, a 
large blotch in the middle of cell ist R-^; beyond the cord in 
cell 2nd R^, base of i?o, Ro, R^, and in ist M^. 
Abdominal tergites dull orange-yellow, trivittate with slate- 
gray to dark brown, the orange colors brightest on segments 
2 to 4 and the base of 5 ; extreme lateral margins of the seg- 
ments paler; caudal margins of segments 3 and 4 pale yellow 
except along the median area; segments 6 to 8 dark brown; 
sternites with segments 2 to 4 dull orange, on the terminal seg- 
ments passing into dark brown. Hypopygium with the ninth 
tergite reduced to a narrow, transverse, chitinized band wl 
caudal margin is heavily chitinized, smooth, black, and 
shallowly concave; eighth sternite subcarinate, unarmed. 
Holotype, male, Baldy Mountain, Boulder County, Colorado, 
July 24, 1915 (T. D. A. Cockerell) ; above timber line. 
Paratype, male, Manitou Pass, Colorado (F. H. Snow) ; 
from the S. W. Williston collection. 
The type is in the collection of the United States National 
Museum, Cat. No. 19989 ; the paratype is in the collection of 
the American Museum of Natural History. 
v^r 
