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3a Two apical wing cells [Group B] ('^*) (6) 



3b One apical wing- cell I Group C] ('^*) (11) 



4 Tegminal appendix present (5) 



4a Tegminal appendix absent, subniarginal wingvein present 



^-^ ^- (10) 



5 Submarginal wingvein present i Alebra 



5a Submarginal wingvein absent 2 Protalebra 



6 Submarginal wing vein present ; third apical wingvein fork- 

 ed (7) 



6a Submarginal wingvein absent (9) 



7 At least two of the apical cells of the tegmen arising from 



the transverse veins (8) 



7a Only one of the apical cells arising directly from the trans- 

 verse veins 5 Kahaono 



8 Body long and slender 3 Dikraneura 



8a Body short and robust ' 4 Erythria 



9 First two wing veins subparallel 6 Enptcryx 



9a First two wing veins confluent towards the apex 



7 Erythronciira (^=Einpoa) 



IV A^rtex twice as long as pronotum 8 Nirvana 



loa Vertex shorter than pronotum 9 Eitalebra 



11 Submarginal wing vein present. 10 Cicadula (=Eiiipoasca) 

 iia Submarginal wing vein absent 11 Typhlocybella 



12 A^ertex wider than an eye, not produced anteriorly, form- 



ing a curve with the eyes ; f rons not twice as long as 



maxinunn width 12 Aphdiona 



(type Hclioiia biocnla Melichar) 

 123. A-'ertex narrower basally than an eye, angularly produced 

 anteriorly ; frons elognate. mdre than 3 times as long as 

 maximum width ; lora elongate 13 Heliona 



13 A^ertex not produced in front of eyes; radial and median 



with a common apical stalk 14 Dialccticopteryx 



13a A^ertex triangularly produced; cubital and median with a 

 common apical stalk 15 Aneono 



It appears to. me that a form with three apical wing cells and 

 a tegminal appendix represents the most generalized, degradation 

 to two and then to one wing cell results in Groups B and C. the 

 former first having a submarginal wing vein, then losing that. 



** Not counting the supernumerary cell. 



