196 PROC. ENT. SOC. WASH., VOL. 20, NO. 9, DEC., 1918 



OO. Infuscation beyond crossband spread over a large 



part of first and second submarginal cells. 

 P. Hyaline triangle extending almost to costal 



margin fallax 



PP. Hyaline triangle broadly separated from 

 costal margin. 



Q. Yellow triangles on segments 2-4. . .montanus 

 QQ. Yellow triangle only on segment 2; re- 

 maining segments black with narrow 



yellow hind margins dimmocki 



NN. First basal cell almost entirely infuscated; infusca- 

 tion beyond crossband almost entirely filling out first 



submarginal cell indus 



MM. Dark markings of abdomen consisting of 2 or more 

 series of longitudinal lines or dashes. 



R. Hyalin triangle extending beyond first posterior 

 cell. 



S. Scutellum largely black or plumbeous in 



color striatus 



SS. Scutellum largely yellow or yellowish gray. 

 T. Hyaline triangle extending through first 



submarginal cell, nearly to costa sequax 



TT. Hyaline triangle never extending more 

 than halfway through first submarginal 



cell vittatus 



RR. Hyaline triangle not extending beyond first 



posterior cell moechus 



LL. Yellowish brown species, of faded appearance; wing picture 

 dilute. 



U. Basal segment of antenna swollen; ab- 

 domen brown above with small' yellow 

 triangles brunneus 



UU. Basal segment of antenna not swol- 

 len; abdominal markings more con- 

 trasting flavidus 



C. brimleyi- Hine. Beltsville, Md., May 28, 1916; Four-mile 

 Hun below Cowden, Va., female on flowers of Apocynum medium, 

 June 11, 1916; Virginia near Plummers Island, Md., May 8, 1915, 

 McAtee; Falls Church, Va., May 18, 1913, C. T. Greene. 



C. call id us Osten Sacken. Common; extreme dates June 4 

 and July 13; on June 11, 1916, a male was taken on Apocynum 

 flowers along with specimens of the former species, McAtee; the 

 female has been taken on flowers of Ceanothus, Nathan Banks. 

 (V. P. I.) 



