CICADELLINAE : PART I. PROCONIINI 17 



of the bionomics of the vectors of Phony Peach Disease and also (1959b) 



a more specialized account of the transmission of the disease. The 



former is a major modem contribution to our knowledge of the subject. 



As far as is known, all the species of Cicadellinae are xylem feeders. 



KEY TO TRIBES OF CICADELLINAE 



Posterior legs at rest with knees not attaining posterior proepimeral 

 margins (exception: Splonia Signoret) and male pygofer and 

 plates both usually with numerous evenly dispersed microsetae 

 (occasionally with a few interspersed macrosetae) ; antennal ledges 

 usually protuberant in dorsal aspect Proconiini 



Posterior legs at rest with knees nearly always attaining posterior pro- 

 epimeral margins and either male plates or pygofer, or both, with 

 macrosetae or with microsetae not evenly dispersed ; antennal ledges 

 usually not protuberant in dorsal aspect Cicadellini 



Tribe Proconiini 



Proconiida Dallas, 1870a:495. 



Cicadelline leafhoppers of moderate to large size. Head with ocelli 

 much closer to posterior margin than to apex; lateral clypeal sutures 

 nearly always extending onto crown; antennal ledges protuberant in 

 dorsal aspect; transclypeal suture almost always incomplete; face 

 almost always pubescent. Prothorax in lateral aspect usually with a 

 carina on dorsopleural line. Hindlegs at rest with knees not attaining 

 posterior proepimeral margins (exception: Splonia Signoret); posterior 

 femoral setal formula almost always 2:0:0, 2:1:0, 2:1:1, or 2:1:1:1; 

 posterior tibial setal row 2 without intercalary small macrosetae. Male 

 pygofer and plates with numerous evenly dispersed microsetae, or if 

 macrosetae are present, these are interspersed among microsetae. 

 Distribution, Western Hemisphere. 



Included in the Proconiini are the largest leafhoppers. The genera 

 fall into a number of groups, but it has been found difficult to make a 

 synoptic key to the groups. The relationships are represented graph- 

 ically in the diagram on pages 18-19. Genera bearing numbers 33 to 55 

 share the character of the posterior meron being exposed when the 

 forewings are in rest position; but Cuerna, which is undoubtedly closely 

 related to Oncometopia and its relatives, lacks this character, as do 

 Anacuerna and Dechacona, which are believed to be closely related to 

 Cuerna. On the other hand, the posterior meron is exposed in Desamera 

 which appears to be closely related to Ciccus and Procandea in both 

 of which the posterior meron is concealed. 



