24 GUIDE TO ORTHOPTERA 



Tettigiae. 



We possess representatives of half the known genera of this 

 group, the other genera belonging mostly to the Old World. 



Genera of Tettigiae. 



a l . Median carina of pronotum cristiform ; superior lateral sinus 



(at insertion of tegmina) shallow, not nearly so deep as the 



inferior sinus. Nomotettix Morse. 



a 2 . Median carina of pronotum low; superior lateral sinus of 



same nearly as deep as the inferior sinus. 



b\ Vertex of fastigium generally broader than the eyes, pro- 

 jecting beyond them, generally angulate anteriorly. 



Tettix Charpentier. 



b 2 . Vertex of fastigium narrower than the eyes and not pro- 

 jecting beyond them, usually truncate anteriorly. 



Paratettix Bolivar. 

 All these genera are widely distributed in our country, Tettix 



being the most numerous in species, followed by Paratettix. 



Monotettix is confined to North America. 



Batrachideae. 



Only two of the seven known genera of this group occur in the 

 United States, though three others are found in America. 



Genera of Batrachideae. 



a 1 . Body plump; dorsum of pronotum tumid, smooth or slightly 

 punctate, with no antehumeral lateral carinae. Paxilla Bolivar. 

 a 2 . Body more slender ; dorsum of pronotum more or less 

 concave between the carinae, marked with longitudinal rugae and 

 with conspicuous antehumeral lateral carinae. 



Tettigidea Scudder. 



Paxilla is monotypic and known only from Georgia ; Tettigidea 

 is wide spread, extending also to Central and South America, and 

 has several species in the United States. 



