78 THE UNIVERSITY SCIENCE BULLETIN. 



AA. Ledge above antennal sockets small, not projecting beyond curve of 

 head. Anterior tibiae slender, round or triangular. Elytra broad, 

 covering abdominal terga. 



B. Elytra not reticulately veined at apex, head not greatly pro- 

 duced. 

 C. Margin of vertex roundingly obtuse, front inflated. 



D. Antennas of male not enlarged at the apex, pro- 

 notum not twice as long as scutellum, posterior 

 margin slightly emarginate. 

 E. Lateral margins of vertex not distinctly in 

 line with the outer margins of the eyes 



Cicadella. 

 EE. Lateral margins of vertex in line with the 

 outer margins of the eyes. Kolla. 



DD. Antennae of male enlarged at apex, pronotum more 

 than twice as long as scutellum, posterior margin 

 deeply emarginate. Helochara 



CC. Vertex flat, margin distinct, acutely angled with front. 



Gi'aphocephala. 

 BB. Elytra reticulately veined on apical third. Head often pro- 

 duced into a triangle, longer than pronotum. 



Drseculacephala. 



Genus Aulacizes A. & S. 



In this genus the antennal sockets are overhung by a dis- 

 tinct ledge which projects beyond the line of the head. The 

 rather long vertex is bluntly rounded. The pronotum is six- 

 sided, widest at the lateral angles, and with posterior margin 

 slightly emarginate. The anterior tibiae are sulcate above. 

 The elytra are long and narrow, not covering the terga of 

 the abdomen. 



A single specimen of this genus occurs in Kansas. 



Aulacizes irrorata (Fabr.). 



(PI. 6, figs. 1-3.) 

 Cicada irrorata Fabr., Ent. Syst., iv, p. 33, 1794. 

 Cicada nigripennis Fabr., Ent. Syst., iv, p. 3'>, 1794. 

 Tettigonia irrorata Burm., Handb. d. Ent., ii, p. 119, 1835. 

 Proconia nigripennis Walk., List. Homop., iii, p. 783, 1851. 

 Aulacizes rufiventris Walk., List. Homop., iii, p. 796, 1851. 

 Aulacizes irrorata Walk., List. Homop., Suppl., p. 236, 1858. 

 Aulacizes irrorata Stal, Hemip. Fabr., ii, p. 64, 1869. 

 Aulacizes irrorata Uhl., Bui. U. S. Geol. Geog. Surv., 1, p. 357, 1876. 

 Aulacizes irrorata Woodw., BuJ. 111. St. Lab. Nat. Hist., iii, p. 19, pi. 2, figs. 15-18, 

 1887. 



Aulacizes irrorata Ball, Proc. la. Acad. Sci., viii, p. 40, 1901. 

 Aulacizes irrorata Osb., 20th Rept. N. Y. St. Ent., p. 509, 1905. 

 Aulacizes irrorata DeL., Tenn. St. Bd. Ent., Bui. 17, p. 17, 1916. 

 Aulacizes irrorata Van D., Cat. Hemip. N. A., p. 594, 1917. 

 Aulacizes irrorata 01s., Bui. Am. Mus. Nat. Hist., xxxviii, p. 2, 1918. 

 Aulacizes irrorata Lathr., S. C. Agr. Exp. Sta., Bui. 199, p. 27, 1919. 



Form: A large, long species. Length, 11.5 to 12.5 mm. Head a little 

 wider than pronotum, slightly longer than broad. Vertex very obtusely 



