318 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



individually transverse metasternal lobes and broad lateral pro- 

 notal lobes, which also have the humeral sinus very shallow or 

 subobsolete. 



Forms of Group II 



rotundifolia rotundifolia 

 rotundifolia parvipennis 

 rotundifolia iselyi 



Key to the Forms 



A. Humeral sinus of lateral lobes of pronotum well impressed, at least 

 rectangulate. Caudal margin of pronotal disk decidedly arcuate. 

 Individual metasternal lobes not transverse. (Tegmina at least 

 three times as long as greatest width.) 

 B. Size large. Caudal femora at most but slightly surpassing apices of 

 tegmina. Ovipositor not deeper distad of the middle than at the 

 base. (Subgenital plate of male with distal margin V-emarginate 

 except in huasteca.) 

 C. Stridulating field of male tegmina very ample, area of same very 

 much exceeding that of pronotal disk. Ovipositor of female reg- 

 ularly arcuate, margins of the same with decided teeth. (Lateral 

 angles of pronotum decided, continuously indicated. General 

 form of tegmina elongate elliptical, sutural margin distad of anal 

 field regularly and considerably arcuate. Subgenital plate of male 



with distal margin V-emarginate) oblongifolia (DeGcer) 



CC. Stridulating field of male tegmina less ample, area of same not 

 greatly exceeding that of pronotal disk. Ovipositor of female not 

 as regularly arcuate as in alternative category, straighter proxi- 

 mad, margins of same with teeth or serrulations. 

 D. Subgenital plate of male with distal margin V-emarginate. (Ovi- 

 positor elongate or of median length, when margins are serru- 

 late the serrulations are closely placed. Lateral angles of pro- 

 notal disk continuously indicated or only so caudad.) 

 E. Tegmina less elongate, distal half with margins more or less 

 arcuate convergent and nev6r as regularly narrowing as in 

 opposite category. Caudal width of pronotal disk relatively 

 narrower when compared with length of same. Fastigium 

 distinctly more than twice as wide as proximal antennal joint. 

 Ovipositor elongate, with decided teeth, .insolitanew species 

 EE. Tegmina considerably elongate, distal half very distinctly 

 and regularly narrowing, margins there straight converging. 

 Caudal width of pronotal disk relatively broader when com- 

 pared with length of same. Fastigium not more than twice 

 as wide as proximal antennal joint. Ovipositor of medium 

 length, with serrulations. 



