28 THE CANADIAN ENTOMOLOGIST 
The reference to Trimicra is somewhat provisional, although 
probably correct. 
Genus Rhabdomastix Skuse. 
Subgenus Sacandaga Alexander. 
Rhabdomastix flava colcradensis, subsp. n. 
Allied to R. flava flava; antennal flagellum black; pleune 
white-pruinose; femora and tibiae tipped with brownish; wings 
with Ri almost perpendicular to 7^2+3; Rz almost straight; m 
very -long. 
Male. — Length 5.5 mm.; wing 6.9 mm. 
Rostrum and palpi brown. Antenna? with the first scapal 
segrrent yellowish, the remainder of the organ black. Head 
pinkish gray with a very narrow and indistinct median line of 
darl er. 
Pronotum yellowish, a little browner medially, the sides of the 
scuttllum whitish. Mesonotal prsescutum dull whitish yellow, 
dusted sparsely with a grayish pollen, and with three broad, reddish- 
brown stripes; the broad, middle stripe ends far before the trans- 
verse suture and is slightly bifid caudally; scutum with the median 
area whitish, the outer lateral portions of the lobes dark brown; 
scutellum bright yellow; postnotum reddish brown, sparsely prui- 
nose. Pleura yellow, more bluish white pruinose on the meso- 
pleurites. Haltercs light yellow. Legs with the coxae brownish; 
trochanters dull yellow; femora light brown, broadly tipped with 
dark brown; tibiae brown, very narrowly tipped with darker; tarsi 
brown. Wings opalescent, subhyaline; costal region a little more 
yellowish; stigma ill-defined, yellowish brown, veins dark brown. 
Venation: R2 short, almost perpendicular to Ri+z at the fork; 
cress- vein m very long so that the outer deflection of Mz is greatly 
reduced, almost punctiform. 
Abdominal tergites brownish yellow; sternites a little brighter. 
Habitat. — Colorado. 
Holotype, d', Platte Canyon. Colorado, July 17, 1915 (Oslar). 
Close to typical flava Alexander of Northeastern America, 
but sufificiently distinguished by the black antennal flagellum, the 
mesopleura more whitish pruinose, the femora and tibiae tipped 
with brown and in the slightly different venational details. 
