36 GUIDE TO ORTHOPTERA 



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

 verse sulci. 



d^. Pronotal carina percurrent, not obliterated between 

 the sulci. 



e 1. Pronotum cristate anteriorly ; tegmina generally 

 membranaceous over most of the ajjical half. 

 /■I. 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. . . Derottnema Scudder. 

 f'^. Posterior portion of the lateral lobes of the j^ro- 

 notum of equal width throughout. 



g ^ Inferior margin of lateral lobes oblique, the pos- 

 terior angle thereby acute or posteriorly produced. 

 h 1. Lateral canthi of the metazona terminating 

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

 different course ; prozona posteriorly scutellate on 

 disk ; inferior margin of lateral lobes straight, tlie 

 posterior concave ; tegmma fasciate or maculate ; 

 head tumid, the frontal costa moderately con- 

 stricted. . . . Mestohregma Scudder. 

 h ^. Lateral canthi of the metazona acute, passing 

 in the same course beyond the principal sulcus. 

 ■i^. Disk of prozona not posteriorly scutellate ; 

 inferior margin of the lateral lobes straight 

 or arcuate, the posterior concave, the angle 

 slightl}^ produced posteriorly ; frontal costa of 

 head very strongly compressed ; proximal half 

 of tegmina densely coriaceous. Psimdia Stal. 

 ^■^ 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 



