370 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



D. Ventral surface of vertex immaculate, or rarely with a very small 

 distal maculation. Longitudinal transparent area of male 

 tegminal tympanum usually not darkened. 

 E. Size large. Vertex longer, narrowing decidedly and with apex 



narrowly rounded robustus robustus (Scudder) 



EE. Size large to (normally) very large. Vertex shorter, not nar- 

 rowing as decidedly and with apex somewhat broader. 



robustus crepitans (Scudder) 



DD. Ventral surface of vertex rather heavily outlined in black. 



Longitudinal transparent area of male tegminal tympanum 



usually darkened. (Size large. Vertex rather similar to but 



somewhat shorter than that of robustus crepitaiis.) 



caudellianus (Davis) 

 CC. Form of males slender, of females robust with abdomen decidedly 

 enlarged.' Pronotum elongate, expanding evenly caudad. Ovi- 

 positor wider than normal, short, (normally) slightly shorter 

 than caudal femur. ' (Vertex narrowing very weakly to apex, 

 which is broader than in robustus and narrower than in caudel- 

 lianus, ventral surface immaculate.) 

 D. Size of male rather large, form very slender. Head unusually 

 long and narrow with genae somewhat swollen, vertex narrow- 

 ing more gradually to somewhat more broadly rounded apex. 

 Portions adjacent to bases of spines of ventral margins of 



caudal femora not darkened velox (Rehn and Hebard) 



DD. Size of male small, form less slender. Head not unusually 

 long with genae not swollen, vertex narrowing more decidedly 

 (though very weakly) to apex which is less broadly rounded. 

 Portions adjacent to bases of spines of ventral margins of 



caudal femora distinctly darkened palustris (Blatchley) 



AA. Vertex wider than long to very slightly longer than wide, broadly 



and evenly rotundate (ventral surface narrowly margined distad 



with an arcuate black line). 



B. Size small to medium, form slender. Vertex small and usually slightly 



longer than wide. Ovipositor very much longer than caudal femur. 



retusus (Scudder) 



BB. Size large, form robust. Vertex large and usually wider than long. 



Ovipositor slightly shorter than to (rarely) slightly longer than 



caudal femur triops (Linnaeus) 



Specimens Examined.—ln the preparation of the present paper 

 the types of the following species have been before us. 

 Neoconocephalus exiliscanorus (Davis) 

 Neoconocephalus nehrascensis (Bruner) 

 Neoconocephalus melanorhinus (Rehn and Hebard) 



' The female of velox is unknown. 



