254 NEW NORTH AMERICAN DECTICINAE 



the mountains. It is interesting to note that on these arid moun- 

 tains the junipers and pinyons extend upward to near timber 

 Une, a weak growth of timber-Hne pines and scattered patches of 

 aspen occurring above them, no distinctive forest whatever dis- 

 tinguishing the Canadian Zone. 



Idiostatus inyo new species (PI. X, figs. 6, 7 and 8.) 



This species, though of pale and obscure coloration, is closely 

 related to 1. calUmera here descril)ed. The most striking differ- 

 ences are the much more elongate caudal limbs, very weak indi- 

 cation of lateral carinae on pronotum, highly specialized and 

 distinctive male penultimate tergite and similarly specialized but 

 much longer and more slender cerci. 



So weak is the definition between the disk and the lateral lobes 

 of the pronotum in this species, that the structure shows some 

 resemblance to the type normal in the genus Ateloplus. 



Type. — cf ; Near Owen's Lake, Inyo County, CaUfornia. July, 

 1912. [Academy of Natural Sciences of Philadelphia, Type no. 

 5367.] 



Size small for the genus, form slightly more slender than that of /. inermis 

 (Scudder). Vertex one and three-fifths times as wide as proximal antennal 

 joint.'^ 



Pronotum smooth; disk rounding into lateral lobes so gradually that later- 

 al boundaries of the former can not be seen except caudad, where very weak, 

 rounded shoulders occur. Pronotum produced caudad a very short distance; 

 lateral lobes longer than deep, the caudad margin from the rather broadly 

 rounded ventro-caudal angle oblique and showing no humeral sinus, convex 

 callosity at this point moderately broad, feebly convex, delimited along its 

 internal margin by a delicate but distinctly depressed line. Tegmina of same 

 type as found in caUiincra and inermis, extending beyond the pronotum a dis- 

 tance equal to two-thirds the pronotal length, with stridulating field exposed 

 beyond stridulating vein. Prosternum unarmed. 



Penultimate tergite i)roduced, surface weakly bilobate, caudal inaigiu pro- 

 duced in two rounded rectangulate projections, which are somewhat wider 

 than long, with a median emargination of about equal size between, the mar- 

 gins of which emargination are subchitinous. Cerci with shaft moderately 

 stout, cylindrical, nearly four times as long as their proximal width, weakly in- 

 curved, armed at end of proximal two-thirds of internal margin with an erect, 

 sharp spine, which is nearly as long as the remaining distal portion of the cer- 

 cus and is almost vertical to the shaft, tilted slightly proxiinad, apex of cerci 

 armed with a small tooth, less than a third as long, which is directed mesad. 



'" Api)arently due to distortion, the vertex overhangs the face at the inter- 

 fastigial suture in the present specimen. 



