JAMES A. G. REHN AND MORGAN HEBARD . 251 



The Loon Lake series shows some difference from that from 

 Sand Point in having the expansion of the pronotum caudad 

 less decided, Avith median antl lateral carinae of the disk less 

 distinct cephalad. One specimen of the Loon Lake series has 

 the ovipositor straight. 



The type series was taken in the morning of a bright day at 

 Sand Point, Idaho. These specimens were found in a brule 

 about a low tangle of raspberry vines and thistles, overgrowing 

 charred logs and stumps. The stridulation of the males was 

 very faint for so large an insect, in fact a weak buzzing, much 

 like that of Conocephahis fasciatus (DeGeer). All of the speci- 

 mens were found crawling about near the ground, and were by 

 no means as active as the individuals of simplex which the junior 

 author had previously taken in the Yellowstone National Park. 

 Neither did the present individuals appear to have nearby holes, 

 into which to hurry when approached. 



OREOPEDES^'^ new genus 



The present genus represents an extraordinary blending of the 

 characteristics of other Decticine genera. The convexity of the 

 pronotum, without carinae, suggests Aieloplus. The male pen- 

 ultimate tergite shows nearest structural resemblance to that 

 found in Cacopteris,'^'' though not as highly specialized. The 

 male cerci are of a type similar to that developed in certain spe- 

 cies of Eremopedes. 



The decided production caudad of the pronotum, which con- 

 ceals all but the caudal margins of the tegmina, and caudal til)iae 

 lacking the dorsal pair of distal spurs, constitute other diagnostic 

 features of value which do not occur in any of the more closely 

 related genera. 



In linear position we place this genus after Atdoplus and before 

 Eremopedes. 



The genus is monotypic. Genotype. — Oreopedes cryptoptcra 

 new species. 



Generic Description.— Size small, form robust though moder- 

 ately slender for the Decticinae. Head with vertex rather broad, 

 narrowing rather decidedly to the fastigio-facial suture. Pro- 



i^From opog and xy^o:z(o, mountain leaper. 



1^ We do not believe inermis Scudder, genotype of Cacoptcris, to be oongencru; 

 with californicus Pictet {=hermanii Thomas), genotype oi Idiostatiis. We 

 therefore consider Cacopteris a valid generic unit. 



TRANS. AM. ENT. SOC, XLVI. 



