22 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



The probable relationship of these groups can be best expressed 

 diagrammatically as shown herewith. 



Group C 



bullatum 

 laticaiida 

 nigripes 



Group D 



{minor) 



Group A 

 (agile) 



Group B 



glaberrimum 

 vulgare 

 gladiator 

 calcaratum 



Group E 



concinnum 1 

 fidicinium J 



Group F 



{militare) 



(Stenorhoptrum)- 



( Metarhoptrum) • 



Group G 



J volantum 

 \ bradleyi 



Group H 



{superbum) 



I Group I 



1^ j fraternum 

 \ unispina 



Group A is probably the most primitive member of the genus, 

 as it certainly is the simplest type. Group B is less homogeneous 

 than most of the other groups but its specific units are unques- 

 tionably of a common origin. While gladiator and calcaratum 

 show a somewhat analogous development of the tooth of the 

 male cercus and of the lateral lobes of the pronotum, it is also 

 very evident that gladiator is in certain respects closer to vulgare, 

 i. €., in the presence of the peculiar node on the dorsal face of the 

 male cercus and in the general character of the tegmina, while 

 the ovipositor of gladiator in general type suggests more relation- 

 ship to glaberrimum, which, however, has many features of dif- 

 ference. Taken as a whole the four members of the group are 

 closely related in sum total of characters but specifically diver- 

 gent in certain single characters. Group C is somewhat similar 

 in complexion to group B but the relationship of bullatum and 

 laticauda is close and nigripes is a divergent type, the peculiar 



