52 T. D. A. Cocker ell — Descriptions of Tertiary Insects. 



This may well be the larva of the genus Neothanes Scudder, 

 described from the Green River beds ; but as this cannot be 

 demonstrated, I leave it in the blanket genus Carabites. It is 

 dedicated to the writer who first described and figured the 

 larva of an American Carabus. 



It is to be remarked that the Mormolucoides articulatus 

 Hitchcock, from the Trias of Turner's Falls, Mass., is extraor- 

 dinarily like a Carabid larva, and resembles the present insect 

 in the relatively small head and short prothorax. The lateral 

 hind corners of the segments in the Mormolucoides are very 

 much more produced, herein agreeing better with the larva of 

 Silpha. 



(2) A Cicada from Florissant, Colorado. 



Platypedia primigenia sp. nov. Figs. ], 2. 



Length about 23 mm (the apex of abdomen is lost) ; thorax 9 mm 

 long and 8 high (deep) ; compared with the living P. putnami 

 Uhler, the body is larger and more robust, and the head is 

 directed downwards, so that the frontal outline, in lateral view, 

 is much more nearly vertical ; the robust anterior legs are well 

 preserved, and appear to be as in P '. putnami ; as in the living 

 species, the femora are black, and the coxse, seen from behind, 

 pallid ; length of anterior femur and coxa 4 mm , of tibia 3-J ; 

 wings hyaline, with dark veins, as in the recent species, the 

 large triangular second ulnar cell being normal for the genus. 

 Compared with P. putnami, the following differences in the 

 details of the venation are apparent : — 



(1) The fourth apical cell has its inner point lower, so that 

 the lower side of its basal end is not quite half as long as the 

 upper. 



(2) The seventh apical is narrower, its length being at least 

 twice its breadth. 



(3) The eighth apical is longer. 



Florissant, Station 1-i {Wilmatte P. Cockerell, 1907). One 

 specimen, with reverse, in Yale University Museum. 



P. putnami Uhler is found in Colorado to-day ; a specimen 

 before me was collected by Mr. C. DeYoss in Gregory Canon, 

 Boulder Co., Colorado, July, 1907. 



P. primigenia will be easily known from Lithocicada 

 perita Ckll. by the shape of the eighth apical cell, and from 

 Cicada grandiosa Scudd. by the much smaller size. 



