252 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



unusually long with veins prominent. Male cerci^' as in cinereus 

 {vide key). Subgenital plate with distal margin truncate be- 

 tween the rather long disto-lateral styles (these .7 mm. in length). 

 The caudal femora are heavy, with genicular areas usually very 

 dark in color; the genicular lobes are normally bispinose; the 

 ventro-external margins of the caudal femora are armed in the 

 eighty-nine perfect specimens before us as follows: 



Number of spines, 

 Number of specimens, 

 Number of spines, 

 Number of specimens. 

 Number of spines, 

 Number of specimens. 



The series of 12 specimens with these margins unarmed *are 

 from the State of Vera Cruz; the great majority having more 

 than eight spines in all are from Lower California. 



The large series before us shows variability in size, vertex, lat- 

 eral lobes of pronotum, tegmina and particularly apex of the same, 

 male cerci, ovipositor length, coloration of genicular areas of the 

 caudal femora and armament of the ventro-external margins 

 of the same; which is convincing evidence that the present insect 

 is one of the most plastic of the American species of the genus. 



Measurements {in millimeters) of extremes 



y. Length of 



O" body 



San Jof^edelCabo, 



Lower California 13-14.5 



Tepic, Mexico ... 14 . 3 



Orizaba, Mexico . 12 . 4-15 . 4 



Medellin, Mexico 13 . 7 



51 The entire series of males before us from Lower California and Tepic, 

 Mexico, have the distal portion of the cercus somewhat wider than normal with 

 apex more broadly rounded (though not nearly as broadly rounded as in C. 

 spinosus). No other note^vorthy variation occiu-s in the series and, as we 

 have found that in eastern Mexico there is occasionally a marked contrast in 

 the degree of production and narrowness of the distal portion of the cercus, we 

 do not consider that sufficient differentiation has taken place to waiTant the 

 recognition of a western geograjjhic race. 



A male before us from Santa Rosa, Mexico, has the distal portion of the 

 cercus unusually produced for the species ajid narrowing decidedly to the very 

 sharply rounded apex. In a single specimen of the very large series of C. 

 hrcvipennis before us, a similarly unusual development has occurred. 



