98 



MAINE AGRICULTURAL EXPERIMENT STATION. I915. 



^ . s C'. A«u.\ .-.AtAVo, 



Fig. 15. Agallia saiiguinolenta: a, adult; b, nymph, side view; c, 

 nymph, dorsal view; d, face; e, elytron"; f, female; g, male genitalia. 

 (After Osborn and Ball.) 



Key to the Gexera of Tettigoniellidae.* 

 A. Antennal sockets usually overhung by a deep ledge, the anterior 

 extremity of which is defiexed and roundly truncate. 

 Anterior tibiae sulcate above or dilated at the extremity. 

 Elytra narrow, not covering lateral margin of abdominal 

 tergum. Head and pronotum usually defiexed. 

 B. Thorax roundingly six-angular, posterior margin rounding, with 

 a short median excavation. Vertex longitudinally fur- 

 rowed. Claval veins distant Anlacizes 

 BB. Thorax 4 angular, posterior margin, roundingly emarginate, the 

 anterior and posterior margins nearly parallel. Claval 

 veins often united in the middle or approaching and tied 

 by a cross nervure. 

 C. Vertex long, triangular longer than width between eyes, side 

 margins nearly straight, face as seen from side nearly 

 straight. Homalodisca. 

 CC. Vertex obtusely rounding, shorter or only equal to width be- 

 tween eyes, face as seen from side roundingly angled. 



Oncometopia 

 AA. Ledge above antennal sockets small, the anterior extremity as seen 

 from above not projecting, included in the curve of the 

 head. Anterior tibiae slender, round or triangular. Elytra 

 broad, covering the abdominal tergum. Head and prono- 

 tum rarely sloping. 

 B. Elytra not reticulate veined at apex, at most with five apical and 

 three anteapical cells, head not greatly produced. 

 •C. Vertex with margin rounding obtuse, the front inflated. 



D. Antennae setaceous, pronotum not twice as long as scutel- 

 lum, the posterior margin long not strongly emarginate. 



Tettigoniella. 



* Adapted from key by E. D. Ball. 



