THE CANADIAN ENTOMOLOGIST 201 



pleural membranes yellowish brown. Halteres yellow. Legs 

 with the coxae and- trochanters yellowish, remainder of the legs 

 brown. Wings dusky gray, the stigma distinct; an indistinct, 

 brown seam along the cord; veins dark brown. Venation as in 

 fig. 5. 



Abdomen light brown with a broad, blackish, sublateral 

 stripe on either side of the tergites; hypopygium small, brownish 

 yellow; sternites brown. 



Female. — Slightly larger than the male, the basal segments 

 of the antennae not so enlarged; flagellar segments oval, those 

 toward the tip more attenuated; humeral portions of the thorax 

 whitish yellow; abdominal tergites with the sublateral stripes 

 somewhat narrower; tergal valves of the ovipositor pointed at 

 their apices. 



Holotype, cf, Maywood, Alexandria Co., Virginia, October 19, 

 1915, (W. L. McAtee); at light. 



Allotopotypes, 9 , October 15, 1915. 



Paratopotypes, 2 9 s, October 16-19, 1915. 



Type in the collection of the United States Biological Survey. 

 A hey to the nearctic species of the genus Erioptera (Empeda) . 



1. Cell ^5^ ilf2 closed; body-coloration yellow 2. 



Cell 1st Ah open; body-coloration gray or brown 3. 



2. Basal deflection of Cm beneath the middle of cell 1st M2; 



vein i?2 oblique, diverging strongly from vein Rz (Eastern 



United States) nyctops Alex. 



Basal deflection of Cu\ before the fork of M; vein R2 not 

 oblique, running parallel with vein Rz (Western United 

 States) alicia Alex. 



3. Wings gray with an indistinct, brown seam along the cord; 



verticils of the male antennae not greatly elongated (Eastern 



United States) noctivagans, sp. n. 



Wings subhyaline without a brown seam along the cord, only 

 the stigmal region slightly darkened, verticils of the male 

 antennae greatly elongated 4. 



4. Body-coloration clear gray, including the thoracic pleura 



(Rocky Mt. Region) cinereipleura, sp. n. 



Body-coloration reddish brown, the pleura reddish gray 

 (Northeastern United States) stigmatica, O. S. 



