June, T920.] DaVIS : XoRTII A.MERICAX CiCADAS. 97 



referred to. In time, as more is learned concerning- the distribution 

 of Cicadas, this will no doubt prove to be the case. 



In the following pages each species is considered separately, and 

 all specimens mentioned are in the writer's collection unless otherwise 

 stated. I am under obligations to a number of entomologists and 

 various institutions for the privilege of examining specimens, or for 

 material received, and acknowledgment is made in connection with 

 the notes on each species. 



A useful table for tlie determination of several of the species of 

 Platyf^cdia will be found in Mr. Van Duzee's Preliminary Review of 

 the West Coast Cicadidc'e, Journal N. Y. Entomological Society, Vol. 

 XXIII, March, 191 5. That author makes the helpful statement that, 

 ■' Normally all our species of Platypcdia have the following pale 

 markings : Sides of the face, supra-antennal plates in part, median 

 line and hind edge of the pronotum, hind margin of the metanotum 

 including the posterior one half of the elevated X> the costal nervure 

 as far as the node and tlie propleura superiorly." 



We would like again to emphasize the importance of stretching 

 the specimens, or at least the two wings on the left hand side of the 

 body, so that the characters can be more plainly seen. Tlie mem- 

 branes at the base of the wings in Platypcdia and N'coplatypcdia are 

 often colored in a manner useful in the determination of species, and 

 this character can hardly be seen when the wings are closed. The 

 reproduced photographs on the plate accompanying this article serve 

 to illustrate the size, venation, and general shape of wings and body, 

 but they do not show the often very beautiful and strikingly con- 

 trasted colors exhibited by some of the species. 



Key to the Genera .\nd Species of Platvpedia and Neoplatvpedia. 



.\pical cells of fore wing eight ; costal vein of fore wings evenly curved except 

 in Platypcdia barbata, where it is somewhat suddenly bent. A ventral view 

 chows the underside of the abdomen not hidden by the closed winijs. 



Platypcdia Uhler. 



Apical cells of fore wing seven ; costal vein of fore wings expanded and con- 

 spicuously bent beyond the middle of the radial cell. In ventral view the 

 apical portion of the underside of the abdomen is hidden if the wings are 

 closed Neoplatypedia new genus. 



