22 Journal New York Entomological Society, t^'^'- >^xiiL 



of these forms are well distinguished by their songs and habitats. It 

 is hoped that material may be available later for a more complete 

 monograph of our west coast cicadas to which figures and full locality 

 records may be appended. 



In the preparation of this paper I have used my own material, 

 taken mostly in San Diego Co., the fine series in the collection of Dr. 

 Frank E. Blaisdell, those in the collection of the California Academy 

 of Sciences, mostly taken by Dr. E. C. Van Dyke, and a few in the 

 collection of the University of California, largely gathered by Prof. 

 C. W. Woodworth. Other material has been received from Mr. E. 

 O. Essig, Mr. C. L. Eox, and Dr. H. F. Wilson, the latter mostly 

 from Oregon. Mr. Wm. T. Davis of Staten Island, New York, 

 has sent me for comparison a very interesting series including the 

 types of his new species described in a paper preceding this. I give 

 first Prof. Woodworth's key for distinguishing the west coast genera 

 by characters common to the two sexes. 



Mesonotum completely covering the middle of the metanotum. 

 Prothorax widest behind. 



Abdomen tapering behind Tibicen. 



Abdomen rounded behind Cacama. 



Prothorax widest at the middle Zammara. 



Metanotum conspicuous behind the mesonotum. 



Node in outer third of elytra Platypedia. 



Node in middle third of elytra. 



Posterior crossvein thickened Clidophleps. 



Posterior crossvein not thickened. 



Median transverse suture of elytra not very evident across the 



cells Okanagana. 



Median transverse suture of elytra marked by a bend of the 

 cell membranes and by pigment lines Tibicinoides. 



In the above table the characters given opposite each name dis- 

 tinguishes that genus from all others in our fauna except Tibicen and 

 Okanagana which are distinguished negatively and from each other 

 by the mesonotal character given above. The former has the head 

 nearly as wide as the thorax, an infuscated W-shaped mark near the 

 apex of the elytra, a pentagonal basal cell in the elytra, and in the 

 males covered tympana, in all of which characters it differs from 

 Okanagana. 



