LAWSON: KANSAS CICADID^. 311 



western faunas meet somewhere in the central portions of our 

 state. This condition seems to prevail in spite of the fact that 

 most life zone maps show nearly all of the state as belonging 

 to the Upper Austral while just a few southeastern counties 

 come into the northern limits of the Lower Austral. 



An attempt has been made in this paper to start on a study 

 of various structural characters to determine their importance 

 as aids in systematic work. Thus a beginning has been made 

 in the study of the ovipositors of the species occurring in the 

 state. Much more work will be necessary before one could be 

 dogmatic about their value, but at present it seems certain 

 that in some cases at least the ovipositors are characteristic of 

 the species. The writer hopes to continue this study with a 

 larger series of each species as well as with more species and 

 give his results in a future paper. Similarly the study of the 

 last ventral segments of both sexes will in some cases reveal 

 good taxonomic characters. 



The form of the descriptions here given will also be rather 

 new, but the attempt has been made to bring this form more 

 into harmony with that used to describe the members of the 

 other families of the same group. It is hoped that this might 

 be an aid in the study of these families. 



