Jassidcp of Illinois. 15 



by a cross-vein. Posterior fork of the second sector likewise con- 

 nected with the third simple sector. Fonrth sector simple, the 

 fifth forked, and the sixth small and simple. The marginal 

 vein turns abruptly to the margin after attaining the posterior 

 fork of the fifth sector. Abdomen with six segments in the 

 female, seven in the male. 



Two very dissimilar species in our fauna belong to this 

 genus; O. undata Fabr., and 0. costalis Fabr. The former is 

 long and slender; the head and thorax are much deflexed; the 

 elytra have rather large apical cells; and the claval veins are 

 united with one or more cross-veins ; while in the latter species the 

 body is short and thick, with the head and thorax relatively 

 but little deflexed, the apical cells in the elytra small, and the 

 claval veins separate. 



These species are known in collections, and in most books, 

 under the generic name Proconia, but St§,l has shown (in 

 Hemip. Fabr.) that Proconia Lep. & Serv. is not Proconia of 

 Am. & Serv. He therefore uses Proconia as originally intended 

 and divides Proconia Am. & Serv. into several genera, one of 

 which is Oncometopia. 



O. undata Fabr. (PI. II., Figs. 10-14.) 



Cicada undata Fabr. Ent. Syst. IV., p. 32, 23 ; Fabr. Syst. Rhyng. 



p. 62, 5.— Coquel ). lUust. 1, p. 32, tab. 8, fig. 3.— Blanch. Hist. 



Nat. III., p. 192, 160. 

 Cicada orbona Fabr. Ent. Syst. Sup., p. 520, 25-6 ; Fabr. Syst. Rhyng. 



p. 72, 50. 

 Tettigonia undata Germ. Mag. d'Ent. Tome IV., p. 61, 6. — Sign., Ann. 



Soc. Ent. Fr. Tome II., p. 486, 225, PI. 17, fig. 5. 

 Proconia undata Walk., List of Homop., p. 783, 3. 

 Proconia nigricans Walk., 1. c, p. 783, 8. 

 Proconia tenebrosa Walk., List of Hemip., p. 787, 16. 

 Proconia plagiata Walk., List of Homop., p, 788, 17. 

 Oncometopia undata Stal, Hemip. Fa1>r., Part II., p. 62. 



Cylindrical, slate-blue or gray above, head, scutellum, and 

 the under side reddish yellow. 



Length 12 mm. 



Head. Above marked with somewhat irregular black 

 lines in the following manner: a line along the hind margin 

 next the thorax; one around the front edge of the head; a pair 



