200 THE CANADIAN ENTOMOLOGIST 



Holotype, cf , Geneva Park, Grant, Colorado, altitude 10,000 

 feet, July 16, 1916 (L. O. Jackson). 



Allotopotype, 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 Cin, 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 fovese 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 yellow 

 hypopygium. 



Holotype, d". 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. Antennae 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 broAvn, the humeral portions bright yellow; 

 praescutum before the pseudosutural foveae slightly brightened. 

 Pleura and sternum dark coloured with a sparse, gray pruinosity; 



