226 STUDIES IN AMERICAN TETTIGONIIDAE (oRTHOPTERA) 



The following key includes, in addition to the subgenera recog- 

 nized by us in the first paper, others here erected. Unquestion- 

 ably numerous other subgenera exist and will be described when 

 careful study of the species of the w^orld is made. 



Key to the Subgenera of the Genus Conocephalus 



A. Prosternum bispinose. 



B. Caudal tibiae armed at distal extremity with three pairs of spurs. 



C. Ventral margins of cephalic and median tibiae armed with five to 

 seven (normally six) well spaced spines. 



D. Male subgenital plate produced in long sharp spikes. 



E. Productions situated meso-distad, intervening space strongly 

 obtuse-angulate emarginate; styles absent. 



Dicellura Rehn and Hebard 



EE. Productions situated disto-laterad, intervening space roundly 



emarginate; awl-like styles present, situated on ventral surfaces of 



lateral productions. Opeastylus new subgenus 



DD. Male subgenital plate with distal margin more or less decidedly 



truncate with no decided emargination or production; small, slender, 



fihform styles present disto-laterad. Xiphidion Serville 



CC. Ventral margins of cephalic and median tibiae armed with nine to 



ten closely set spines. . Palotta F. Walker 



BB. Caudal tibiae armed at distal extremity with five spurs (interno-dorsal 



spur missing). Ventral margins of cephalic and median tibiae armed with 



six well spaced spines. Male subgenital phite as in Xiphidion. 



Perissacanthus new subgenus 

 BBB. Caudal tibiae armed at distal extremity with a single pair of spurs 

 (dorsal and ventral pairs absent)'. Ventral margins of cephalic and median 

 tibiae armed with seven to eight well spaced spines. 



Aphauropus new subgenus 

 AA. Prosternum unarmed. (Ventral margins of cephalic and median tibiae 

 armed with five to seven well spaced spines.) 



B. Caudal tibiae armed at distal extremity with three pairs of spurs. 



Conocephalus Thunberg 

 BB. Caudal tibiae armed at distal extremity with a single pair of spurs 

 (dorsal and ventral pairs absent). (Male subgenital plate as in Xiphidion.) 



Anarthropus Rehn and Hebard 



As yet, Dicellura is known only from the southern Appalach- 

 ian region of the eastern United States, Opeastylus is widely dis- 

 tributed in temperate and subtropical South America and the 

 only subgenus found in the former region, Xiphidion is the 

 dominant subgenus from subtropical South America northward 



