March, 1921.] DaVIS : ANNOTATED LiST OF COLORADO CiCADAS. 57 



the wing; the radial cell does not extend beyond the middle, and the 

 eighth apical cell is very large and inversely triangular. 

 Platypedia primigenia Cockerell. 



Described and figured in The American Journal of Science for 

 January, 1908, p. 52, from a well preserved specimen found at 

 Florissant in 1907. The following are some of the salient char- 

 acters: Length about 23 mm. (the apex of abdomen is lost). Com- 

 pared with the living pntiiami, the body is larger and more robust. 

 As in that species the femora are black. P. primigenia will be easily 

 known from Lithocicada pcrifa Cockerell, by the shape of the eighth 

 apical cell, and from Cicada grandiosa Scudd.. by the much smaller 

 size. 



It is interesting to learn that the genus Platypodia was represented 

 in Colorado in Miocene times, as it is today. 



EXPLAXATIOX OF PLATE V. 



Proarna venosa (Uhler). 

 Okanagana synodica (Say). 

 Okanagana striatipes (Haldeman). 

 Okanagana hesperia (Uhler). 

 Platypedia lafipcniiis Davis. Type. 



