Mr. W. L. Distant on Ilomoptera. 305 



anteriorly and exposing them interiorly or the reverse, or 

 smaller, exposing them both anteriorly and interiorly ; tho 

 lateral margins of the pronotum are not convexly ampliate 

 nor medially angulate ; the tegmina and wings are hyaline, 

 sometimes maculate. 



Tiie genera composing this division are confined to the 

 Palsearctic, Oriental, and Malayan regions and represented in 

 Japan, 



Synopsis of Genera, 



1. Abdomen not tuberculate beneath. 



A. Tympanal coverings narrower, but scarcely shorter 



than tympanal cavities. 

 a. Lateral margins of pronotum moderately ampliate. 

 b. Head shorter than pronotum. 



c. Abdomen longer than space between apex of 



head and base of crucitorm elevation Tettigia. 



aa. Lateral margins of pronotum straight, not 

 ampliate. 

 bb. Head as long as pronotum. 



cc. Abdomen short, about as long as space be- 

 tween apex of head and base of cruciform 

 elevation Emaihia. 



B. Tympanal coverings both narrower and shorter than 



tympanal cavities. 

 d. Opercula in cJ short and transverse, not or scarcely 

 extending be>'ond base of abdomen. 

 e. Head detlected anteriorly, front not prominent. 

 f. Pronotum distinctly shorter than mesonotum. 

 g. Lengtli of liead about equal to breadth be- 

 tween eyes ; abdomen in J louger than 

 space between apex of bead and base of 

 cruciform elevation. 

 h. Greatest width of tegmina only one third 



of length, broader than wings Terpnosia. 



hh. Greatest width of tegmina considerably 

 more than oue third of length, but 



scarcely broader than wings Sena, 



gg. Length of head less than width between 

 eyes ; abdomen in cf about as long as 

 space between apex of head and base of 



cruciform elevation Cicadatra, 



dd. Opercula in J short but well developed, at least 

 reacbiiTg the apex of the second abdominal 



segment Khimbya. 



ddd. Opercula in J extending beyond the middle of 

 abdo:nen. 

 ee. Head not deflected anteriorly, the front very 

 prominent. 

 ff. Pronotum as long as mesonotum Ltthama, 



C. Tympanal coverings shorter, but not narrower than 



tympanal cavities. 

 eee. Head with the front prominent, its lateral mar- 

 gins at right angles with anterior margins of 

 vertex. 



