36 THE CANADIAN ENTOMOLOGIST. 



B. Sternum green or yellow. 



C. Size medium to small; length, 3-4.25 mm.; vertex not strongly 



produced. 



D. Elytra whitish-translucent; head and thorax pale olive-green; 



slender ; length, 3.5-4 mm itnpidus. 



DD. Elytra whitish-subhyaline, greenish to yellow on basal two-thirds; 



head and thorax yellow or yellowish-green ; robust, length, 



3.75-4 mm. . . , wipidtis, var. flavus, n. var. 



DDD. Elytra pale greenish-hyaline ; head and thorax green ; slender, 



length, 4.25 mm medius, n. sp. 



CC. Size large ; length, 5 mm.; vertex strongly produced ; yellowish 



throughout, with hyaline elytra manitou. 



BB. Sternum black. 



E. Face at least, and usually vertex, pronotum, and scutel, with dis- 



tinct fuscous markings. 



F. Elytra not distinctly maculated with black ; vertex not 



produced confusus. 



FF. Elytra more or less strongly marked with black ; vertex distinctly 



produced , pujtctatus. 



EE. Face, vertex, pronotum, and scutellum, greenish, without distinct 



fuscous markings. 



G. Elytra whitish-translucent throughout ; veins narrowly greenish ; 



slender, length, 4.25 mm occidentalism n. sp, 



GG. Elytra pearly-white, green towards the base; veins broadly green; 

 robust, length, 4.5 mm Livingstofiii, n. sp. 



Gnathodus abdominalis, VanD. 



1892, VanDuzee, Can. Ent., XXIV., p. 113. 



1894. VanDuzee, Trans. Am. Ent. Soc, XXI., p. 307. 



1895. Gillette & Baker, Prelim., List Hemip., Colo., p. 104. 

 1895. Gillette, 7th Ann. Rep. Colo. Exp. Sta., p. 60. 



Head wider than pronotum. Face a fourth wider than long. Front 

 two-sevenths longer than wide, two and one-sixth times longer than the 

 clypeus. Clypeus broader at base than at tip, sides subparallel or 

 slightly incurved, tip broadly rounded. Vertex evenly rounded, not pro- 

 duced. Pronotum two and one-eighth times as wide as long, length two 

 and a fourth times that of the vertex, hind margin nearly straight, 

 curvature about half of the length. Ovipositor exceeding the pygofers. 

 Hind margin of the last ventral segment in the female apparently slightly 



