194 W. D. FUNKHOUSER 



The most important papers relative to the basin as a faunal and a floral 

 area, and indeed the only ones in which the subject is discussed with direct 

 application to tne local physiography, are those already mentioned — 

 the work by Dudley (1886) and that by Reed and Wright (1909). Of 

 these the former is the more valuable in connection with the study of 

 phytophagous insects, since it offers valuable data concerning the dis- 

 tribution of the plant forms that serve as hosts. 



The distribution of the Membracidae according to the range of their 

 host plants is noticeable to a marked degree thruout the State. Pro- 

 fessor W. L. Bray, of Syracuse University, has made a careful study of the 

 floral regions in New York State, and has shown that the areas as outlined 

 in this study for insects agree with the zonal distribution of plants. He 

 states (Bray, 1915:59-60): 



The study of certain features of the dissected highlands — deeply cut valleys and the 

 slope and exposure of their adjacent sides — yields instructive data as to the distribution of 

 floristic elements. 



In general the dissection of the plateaus by north-south drainage channels leads to a 



northerly extension of austral species This northerly extension 



appears to be especially marked in the region where the long, deep valleys of the Cayuga and 

 Seneca lake basins continue the dissection across the plateau into the Ontario basin. 



There seems to be no doubt that this is the case in the region under 

 consideration, and it is likely that the migration of certain plant species 

 has had much to do with the distribution of the insect forms that feed on 

 these plants or are limited to particular plant hosts for their oviposition. 



CHECK LIST OF GENERA AND SPECIES 



The following species of Membracidae have been recorded for the 

 Cayuga Lake Basin: 



Centrotinae: 



1. Microcentrus caryae Fitch (p. 209) 



Membracinae : 



2. Campylenchia latipes Say (p. 212) 



3. Enchenopa binotata Say (p. 214) 



Smiliinae ; 



4. Ceresa dicer os Say (p. 218) 



5. Ceresa bubal us Fabr. (p. 219) 



6. Ceresa taurina Fitch (p. 225) 



7. Ceresa constans Walk. (p. 227) 



