June-Sept, i 9 1 9-] DAVIS : ClCADAS. 179 



1913. Melaxder, A. L. A synopsis of the dipterous groups Agromyzinae, Mili- 



chiinse, Ochthiphilinse and Geomyzinse. Jonrn. N. Y. Ent. Soc, XXI, 



pp. 219-300, PI. VIII. 

 191 5. Becker, Th. Diptera Brachycera (1 re parte). Alhiaud et Jeannel 



Voyage en Afr. orient., Ins. Dipt. V, pp. 147-190, PI. I. 

 1915. de Meijere, J. C. H. Fauna simalurensis — Diptera. Tijdschr.v. Entoin., 



LVIII, pp. 1-63, PI. I. 

 191 5. de Meijere, J. C. H. Studien vtber siidostasiatische Dipteren, X. Dip- 



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Verzeichnis der von mir behandelten Arten. Tijdschr. v. Entom., 



LX, pp. 275-369. 



CICADAS OF THE GENERA OKANAGANA, TIBICIN- 

 OIDES AND OKANAGODES, WITH DESCRIP- 

 TIONS OF SEVERAL NEW SPECIES. 



By Wm. T. Davis, 

 New Brighton, Staten Island, N. Y. 



The genus Okanagana probably contains more species of cicadas 

 than any other in North America, and they are also in many instances 

 quite hard to separate. In the northeastern part of the continent 

 there appear to be only two species, but in the central and western 

 parts it is far otherwise, and in California they are very numerous. 

 As a rule the individuals of the same species resemble one another 

 quite closely in color pattern, but occasional variation is seen, espe- 

 cially when the species is rather widely distributed. In his Pre- 

 liminary Review of the West Coast Cicadidse, published in the 

 Journal of the N. Y. Entomological Society, March, 191 5, Mr. 

 E. P. Van Duzee states that the " structural characters are very few 

 in some of the genera, notably Okanagana, and I have been obliged 

 to fall back upon color characters in the preparation of the key. The 

 color and markings, while variable in extent, are quite constant in 

 general facies for each species." A considerable number of species 

 have been made known since 191 5, but it will be some time before our 

 collections are sufficiently complete to warrant the statement as to 

 the exact number. 



In considering the genus Okanagana it became necessary to first 



