200 THE CANADIAN ENTOMOLOGIST 
Holotype, cf , Geneva Park, Grant, Colorado, altitude 10,000 
feet, July 16, 1916 (L. O. Jackson). 
AUotopotype, 9 , July 21, 1916. 
Paratopotype, 9 , altitude 9,500 feet, July 22, 1916. 
This fly will probably be found to be a valid species. It 
differs from indigena in the dusky brown body coloration, the gray 
wings with a more extensive brown seam, the position of the basal 
deflection of Cu\, etc. 
Tribe Eriopterini. 
Genus Erioptera Meigen. 
Erioptera (Empeda) cinereipleura, sp. n. 
Male. — Length 4 mm.; wing 4.5 mm. 
Similar to E. stigmatica O. S. (Northeastern America) but the 
body-coloration clearer gray throughout. Antennae darker, brown, 
the male with very long verticils. 
Mesonotal praescutum gray, the pseudosutural foveae and the 
tuberculate pits large and conspicuous, black, the latter closely 
approximated, separated by a distance less than the diameter of 
one. Pleura clear light gray, not reddish gray as in stigmatica. 
Legs with the femora yellowish basally, soon passing into brown. 
Wings grayish subhyaline, the stigma clear but distinct (fig. 6). 
Abdominal tergites dark brown, contrasting with the \ellow 
hypopygium. 
Holotype, &, Hall Valley, Colorado, August 11, 1915 (E. J. 
Oslar). 
Erioptera (Empeda) noctivagans, sp. n. 
Wings pale dusky with an indistinct brown seam along the 
cord. 
Male. — Length 3.2 mm.; wing 4.7 mm. 
Female. — Length 3.8-4.1 mm.; wing 5.6-5.8 mm. 
Male. — Rostrum and palpi black. Antennje black, the second 
and third antennal segments enlarged, the flagellum without ex- 
ceedingly elongated verticils as in stigmatica, cinereipleura, etc. 
Head dark gray. 
Thorax grayish brown, the humeral portions bright yellow; 
praescutum before the pseudosutural foveae slightly brightened. 
Pleura and sternum dark coloured with a sparse, gray pruinosity; 
