122 Proceedings of the Biological Society of Washingtoii. 

 Synopsis op the Genera op the Eupterygidae. 



A. Membrane appendiculate. 



B. Wing with submarginal vein; apical wing cells 3. Alebra. 



BB. Wing without submarginal vein; apical wing cells 3. Protalebra. 

 AA. Membrane not appendiculate. 



0. Wing with submarginal vein. 

 * Apical wing cells 3. 

 D. Vertex shorter than pronotum Eualebra. 



DD. Vertex twice as long as pronotum Nirvana. 



**Apical wing cells 2. 

 E. More than one apical vein arising from cross- 

 veins of tegmen Dikraneura* 

 EE. Only one apical vein arising from cross-veins 



of tegmen, it 3-parted Kahaono. 



***Apical wing cell 1. 



F. Margins of front not prominent Empoasca.i 



FF. Margins of front prominent, united above. 

 G. Front not twice as long as wide, rounded 



above Apheliona. 



GG. Front three times as long as wide, acute 



ibove Heliona. 



CC. Wing without submarginal vein 



*Apical wing cells 3 ; first two wing veins not 



confluent, joined by a cross-vein Eupteryx. 



**Apical wing cells 2; first 2 wing veins confluent. 

 H. Fourth apical vein of tegmen curving to 

 radial margin ; second apical cell trian- 

 gular usually stalked Typhlocyba. 

 HH. Fourth apical vein of tegmen paralleling 

 radial margin ending in apical margin ; 

 second apical cell oblong, based on 

 cross vein 

 I. Veins of tegmen thickened and con- 

 spicuous basally Molopopterusi 

 II. Veins of tegmen invisible basally Erythroneura.§ 

 *** Apical wing cell 1. 



J. Tegmen rounded apically Dialecticopteryxf 



JJ. Tegmen angulate apically; second 



apical cell diamond-shaped Typhlocybella. 



