24 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



a clear idea of the differential features of a certain form or forms, 

 we would suggest that the figures given in this paper for the 

 species involved be examined. With the aid of the figures we 

 feel that proper identification can readily be made. 



MALES 

 A. Cercus of average length, portion distad of insertion of median tooth not 

 markedly longer than that proximad of same. General form relatively more 

 robust. 



B. Tooth of cercus distinctly longer than distal portion of cereal shaft 

 and greatly produced, decidedly aciculate. (Humeral sinus. hardly indi- 

 cated; ventro-external margin of caudal femora armed.) 



calcaratum new species 

 BB. Tooth of cercus not longer than distal portion of cereal shaft, not 

 decidedly aciculate. 



C. Dorsal surface of shaft of cercus without a very decided sinuate 

 carination. 



D. Cercus distinctly depressed, tooth particularly so. (Tooth 

 of cercus directed at a right angle to general axis of cereal shaft, 

 also moderately uncinate at apex. Humeral sinus well indi- 

 cated.) agUe (DeGeer) 

 DD. Cercus not distinctly depressed, tooth more or less thick- 

 ened in its proximal half. 



E. Dorsal surface of cereal shaft without a decided elevated 

 "boss" or node between insertion of tooth and apex of shaft. 

 Speculum of stridulating field more decidedly longitudinal. 

 (Head more or less reddish.) glaberrimum (Burmeister) 

 EE. Dorsal surface of cereal shaft with a decided elevated 

 "boss" or node between insertion of tooth and apex of shaft. 

 Speculum of stridulating field subquadrate. 



F. Tooth of cercus as long as distal half of shaft of 

 same, apex of shaft blunt acute. Humeral sinus hardly 

 indicated, ventro-caudal angle of lateral lobes rectangu- 

 late. gladiator Bruner 



FF. Tooth of cercus not as long as distal half of shaft 

 of same, apex of shaft bluntly rounded. Humeral sinus 

 well indicated, ventro-caudal angle of lateral lobes 

 obtusely rounded. vulgare Harris 



CC. Dorsal sui-face of shaft of cercus with a very decided sinuate 

 carination. 



D. Tooth of cercus not strongly adpressed against proximal 

 portion of sinuate carina. Caudal margin of lateral lobes of 

 pronotum with humeral sinus appreciably indicated and re- 

 mainder of margin weakly arcuate. Tibiae not blackish. 



E. Fastigrium relatively broader. Metazona occupying but 

 little less than half of dorsal length of pronotum. Lateral 

 lobes of pronotum relatively shorter, ventro-caudal angle 



