64 PROCEEDINGS OF THE ACADEMY OF [March, 



Key to Species. 



We would suggest that, in using this key, frequent reference 

 be made to the figures accompanying the paper. Occasionally 

 insistence is made upon a single differential character, and in 

 such cases it should be borne in mind that these characters are 

 the crucial ones, not subject to fluctuation by variation. Other 

 features may aid in distinguishing the forms, and these are de- 

 tailed under the specific treatments, but variation will occasion- 

 ally rob these features of their critical value. 



A. Lateral carinae of pronotum strongly or weakly (intertexta) , but 

 always appreciably indicated. Form slender or relatively 

 robust; when of the latter tj^pe the tegmina bear a longi- 

 tudinal pale fine in distal half of discoidal field, in addition 

 to the strongly marked proximal subcostal line and pale anal 

 angles of tegmina. 

 B. Supplementary carinae on lateral lobes of pronotum evident 

 (rather weakly in neo-mexicana) . Species decidedly or 

 typically xerophilous. 

 C. Form relatively robust. Lateral carinae of pronotum 

 decidedly diverging caudad, rarely by variation sub- 

 parallel. Lateral lobes of pronotum with ventral margin 

 shorter than depth of lobes. Tegmina relatively broad. 

 Color pattern bold, distinctive; subcostal pale line of 

 tegmina strongly marked, narrow; medio-longitudinal 

 dorsal line invariably present. Antennae moderately 

 ensiform. Caudal femora relatively robust, almost in- 

 variably falling distinctly short of the tegminal apices. 

 Subgenital plate of male short, weakly produced, blunted. 



texana Bruner 

 CC. Form slender. Lateral carinae of pronotum not at all, 

 or, by variation, faintly diverging caudad. Lateral 

 lobes of pronotum with ventral margin longer than 

 depth of lobes. Tegmina relatively narrow. Color 

 pattern with broad medio-longitudinal dorsal line rarely 

 present. Antennae strongly ensiform. Caudal femora 

 slender (surpassing, equalling, or falling faintly short 

 of tegminal apices). Subgenital plate of male pro- 

 duced, elongate pyramidical. 

 D. Fastigium more semi-elliptical, the sides converging in 

 a well-rounded curve, the tip very broadly or at least 

 bluntly rounded. Subgenital plate of male moderately 

 produced. Species campestrian, central and western 



in habitat neo-mexicana (Thomas) 



DD. Fastigium triangular, the sides converging in straight 

 or only slightly curved lines, the tip narrowly rounded. 

 Subgenital plate of male greatly produced. Species 



