270 NEARCTIC ERYTHRONEURA (hOMOPTERa) 



BB. Fourth cross-vein normally in line with or parallel to third, and join- 

 ing radial margin aj^proximately at right angles (fig. 12) ; apex of second 

 api(!al cell black or with a black spot Group 6 



Key to the Species by Groups 

 Group 1 



A. Consists of a single species, which in all its color forms, retains traces at 

 least of a narrow median pale vitta on vertex, pronotum and scutellum. 



E. vulnerata Fitch, p. 272. 



Group 2 

 A. Tegmina hyaline, or color markings when present chiefly longitudinal, 

 consisting of oblique vittae, which in some varieties are fused into 



broad stripes E. obliqua Say, p. 275. 



AA. Principal color markings transverse, or occupying nearly all of tegmina 

 to cross-veins. 

 B. An oblique cross-band at about middle of tegmen; scutellum, and more 



or less of thorax red E. rubroscuta Gillette, p. 282. 



BB. Dorsal surface chiefly occupied by a reddish saddle spot (dusky within) 

 which extends to apex of clavus on the median line, but only to the 

 middle along costa. . E. crevecoeuri Gillette, p. 283. 



Group 3 



A. Vertex very short, nearly as long at inner margin of eye as at middle 



(fig. 1); vertex and scutellum each with two distinct dark dots. 



E. bipunctata Gillette, p. 283. 

 AA. Vertex distinctly longer at middle than along inner margin of eye (figs. 

 2, 3), without dark clots. 

 B. Length 3.8 to 4.5 mm.; vertex long but bluntly rounded (fig. 2); color 



clear pale yellow E. ador McAtee, p. 284. 



BB. Smaller species; vertex not so long nor so blunt (fig. 3). 



C. Genital plate of female ending in a broad, notched process; tegmina 

 stramineous with orange-yellow vittae; western species. 



E. dentata Gillette, p. 285. 

 CC. (Jenital i)late of female, and c-oloration of tegmina chiefly other- 

 wise; eastern species E. abolla new species, p. 285. 



Group 4 

 A. Vertex rather bluntly rountled (fig. 6); clavus roof-shaped when at rest; 

 basal triangles of scutellum and two dots on vertex Ijlack. 



E. tecta new species, p. 288. 



AA. Vertex more pointed (figs. 3, 4, 5) ; other characters not agreeing with the 



preceding. 



B. Vertex very pointed (fig. 5); a broad dark stripe the whole length 



of the insect, black on vertex, pronotum and scutellum and smoky 



brown on tegmina E. aclys new s{)ecies, p. 290. 



