36 GUIDE TO ORTHOPTERA 



c 2 . Pronotum or pronotal carina twice intersected by trans- 

 verse sulci. 



d l . Pronotal carina percurrent, not obliterated between 

 the sulci. 



e l . Pronotum cristate anteriorly ; tegmina generally 

 membranaceous over most of the apical half. 

 f l . Lateral lobes of the pronotum posteriorly rec- 

 tangulate or obtusangulate, the posterior margin 

 descending obliquely forward ; their metazonal por- 

 tion, posterior to the typical sulcus, thereby narrowed 

 inferiorly; prozona posteriorly scutellate on disk; 

 vertex of head with a transverse carinula on either 

 side next the eyes. . . Derotmema Scudder. 

 /' 2 . Posterior portion of the lateral lobes of the pro- 

 notum of equal width throughout. 



g l . Inferior margin of lateral lobes oblique, the pos- 

 terior angle thereby acute or posteriorly produced. 

 h l . Lateral canthi of the metazona terminating 

 at the principal sulcus, or, if continued, it is in a 

 different course ; prozona posteriorly scutellate on 

 disk ; inferior margin of lateral lobes straight, the 

 posterior concave ; tegmina fasciate or maculate ; 

 head tumid, the frontal costa moderately con- 

 stricted. . . . Mestobregma Scudder. 

 h 2 . Lateral canthi of the metazona acute, passing 

 in the same course beyond the principal sulcus. 



1 1 . Disk of prozona not posteriorly scutellate ; 

 inferior margin of the lateral lobes straight 

 or arcuate, the posterior concave, the angle 

 slightly produced posteriorly ; frontal costa of 

 head very strongly compressed ; proximal half 

 of tegmina densely coriaceous. Psinidia Stal. 



1 2 . Disk of prozona more or less distinctly 

 scutellate posteriorly ; lower margin of the 

 lateral lobes straight and oblique, the posterior 

 margin nearly straight, the angle produced 



