part of the assemblage bears some resemblance to the prevailing t^'pe of 

 European Striditlantia, and suggests the possibility that some of the forms 

 of Tihicina, Cicadrata, and Cicadetta may hereafter prove to be climatal 

 modifications of of species common to both continents. 



The species of Europe are much more numerous than those of the 

 United States, but the former continent lacks the massive and strong 

 forms which are common to our country east of the Rocky Mountains. 



Our forms with the smaller drums and opercula are more feeble and 

 sluggish than those with the larger sonorous apparatus, and while abun- 

 dant along and in the Rocky Mountain belt, cross to to the eastern side 

 of the continent by way of the elevated plateau region north of the Ohio 

 river. 



A new genus Platypedia occurs in the Canons of the Rocky Moun- 

 tains in Colorado, and again in different localities in the high lands of 

 Montana, Nevada, California, and Oregon. 



Below, we otTer a list of the recognized species of the United States, 

 with some references to the localities in which they have been found. 



Family CICADiEA, Fieb. 



Tettigia, Amyot & Serv. 



T. hieroglyphica, Say, [Cicada). Jour. Acad. Phila., 1830, vol. VI, 

 P- 235- 



Cicada characteria. Germ. Thon. Entom. Archiv. , 1830, vol. 



II, p. 4. 



Cicada Joha7iti is, W'sXk. Brit. Mus. List Hom., v. I, p. 149,87. 



Cicada scx-giii/aia, Walk. " " v. I, p. 154, 93- 



Inhabits the coast lands of Eastern North America from Northern 



New Jersey to Southern Florida, from thence it spreads along the coast 



of the Gulf of Mexico across Alabama, Mississippi, Louisiana, and 



Texas into the province of Tamaulipas, Mexico. 



Carineta, Amyot & Serv. 



C. parvii/a, Say. Jour. Acad. Phila., 1825, vol. 4, p. S3Z' 5- 



Cicada pallescens. Germ. Thon. Entom. Archiv. 1830, v. II, 

 p. 8, 93. 

 This neat little insect is of a pale green color when alive, sometimes 

 marked with fuscous, but speedily becomes straw yellow after desiccation 

 and exposure to the air. 



It inhabits the plateau-lands of Georgia, Tennessee, Louisiana, Ar- 



