198 PROCEEDINGS OF THE AMERICAN ACADEMY. 



dr. Tegmiua fully developed or abbreviate, never much if any 

 shorter than the pronotum ; hind margin of pronotum distinctly 

 angulate ; fore and middle femora scarcely more gibbous in the male 

 than in the female (except in some species of Campylacantha). 



e\ Tegmiua fully developed ; disk of pronotum nearly flat, the 

 lateral lobes nearly at right angles to it, the posterior margin 

 rectangulate or subrectaugulate ; prosternal spine quadrate, ap- 

 pressed, broadly truncate Aidemona. 



e^. Tegraina abbreviate ; disk of pronotum tectiform, the pos- 

 terior margin obtusangulate ; prosternal spine more or less 

 conical and acuminate. 



f^. Head not jDrominent, the summit very slightly arched 

 longitudinally ; prosternal spine erect ; f urcula of male com- 

 posed of projecting cylindrical fingers ; surface of body very 

 feebly pilose Hypochlora. 



f^. Head prominent, the summit strongly arched longitudi- 

 nally ; prosternal spine more or less retrorse ; furcula of 

 male reduced to slight scarcely projecting lobes ; surface of 

 the body rather densely pilose .... Campylacantha. 



A^. Lateral margins of subgenital plate of male suddenly ampliate to a 

 considerable degree at the base ; or if not to a considerable degree, then 

 the entire margin rather strongly convex or sinuate. 



b\ Subgenital plate of male furnished with a distinct subapical tubercle 

 (^. e., one in which the apical margin does not pass through and form 

 a part of the summit of the tubercle, but where it is distinctly separated 

 from the summit), but not otherwise tumescent (see note under A^ b^). 



c^. Median carina of pronotum well developed and equally developed 

 throughout, accompanied on the front of the prozoua by distinct 

 lateral carinte ; prosternal spine sharply acuminate ; tubercle of 

 subgenital plate directed wholly backward, occupying the middle 

 of the terminal portion of the plate ; furcula distinctly developed. 



£otettix. 



c^. Median carina of pronotum feebly developed and generally much 

 more feebly on the prozona than on the metazona, accompanied by 

 no lateral carinse whatever ; prosternal spine bluntly acuminate ; 

 tubercle of subgenital plate directed upward, or upward and back- 

 ward, occupying the upper extremity of the terminal portion of 

 the plate. 



