50 



e. Median carina of the pronotnm somewliat prominent; 



lateral cariniT3 absent; eyes elongate ; extremity of male 



abdomen not swollen AcriMum. 



ee. Median carina of the pronotum not prominent; lateral 



carinte present, distinct or obtusely rounded ; eyes not 



elongate ; extremity of male abdomen swollen : 

 /. Eyes closely approximate above ; vertex sub-liexagonal ; 



pronotum sub-cylindrical Ommatolampis. 



ff. Eyes not closely approxim ate above ; vertex longitudinally 



channeled J lateral carinte of the pronotum sub-distinct 



more or less obtusely rounded Galoptenus. 



dd. Wings abortive or wanting : 



e. Prosterual spine truncated at the tip Platyphyma. 



ee. Prosterual spine not truncated at the tip Pezotettix. 



AA. Prosternum notspined; smooth or but slightly tuberculate: 



a. Prosternum smooth, not tuberculate : 

 - j_^' Antennas enlarged at the base ; joints flat and distinct. ■ 



c. Head produced in front into an elongate cone, ascending ; 



face very oblique - Tryxalis. 



CO. Head sub-conical, not or but slightly ascending; face 

 oblique : 



d. Face slightly curving inward below the vertex ; antennae 



distinctly ensiform, about twice the length of the head ; 



elytra longer than the abdomen Pi/rgomorpha. 



dd. Face straight; antennae somewhat ensiform, a little 



longer than the head ; elytra shorter th^n the abdomen . Oxycoryplms. 

 bb. Antennae filiform or clavate; joints indistinct: 



c. Antennae clavate (a flat club at the tip) Gomphocerus. 



cc. Antennae not clavate: 



d. Median carina of the pronotum, whole length of the pro- 



notum, raised into a high, arched, and slightly denticu- 

 late crest Tropidolophus. 



dd. Median carina wanting, slight, distinct, sub-cristate or 

 cristate only on the posterior lobe : 



c. Vertex ascending obliquely in front of the eyes in the form 

 of a short triangular pyramid : 



/. Median carina of the pronotum cristate on the posterior 



lobe AcrolopMtus. 



ff. Median carina of the pronotum slight throughout Pedioscertetes. 



ec. Vertex not ascending in front of the eyes : 



/. Posterior mai-gin of the pronotum truncate Chrysochraon. 



ff'. Posterior margin of the pronotum rounded or angular : 



fl. Elytra in the form of ovate scales ; species large, in- 

 capable of flight Brachypeplus. 



gg. Elytra of the usual form : 



h. Vertex acuminate in front of the eyes ; head narrow : 



j. Face somewhat oblique, straight ; lateral foveolie of ver- 

 tex when present linear Stenobothrus. 



jj. Face slightly oblique, somewhat rounded ; lateral fovejaliu . 



of the vertex triangular or obsolete Tragoceohnla. 



