252 NEW NORTH AMERICAN DECTICINAE 



notum elongate, almost completely concealing the tegmina from 

 above, the metanotum strongly produced caudad; disk rounding 

 evenly into the lateral lobes, the latero-caudal shoulders sub- 

 obsolete, suggesting the type developed in Ateloplus but very 

 much more elongate; lateral lobes over twice as long as deep, 

 with a broad but distinct humeral sinus, convex callosities obso- 

 lete. Tegmina in male with all but caudal margins concealed by 

 the pronotum. Dorsal surface of male abdomen medio-longi- 

 tudinally carinate. Penultimate tergite specialized, the type of 

 specialization similar to that found in the genus Cacopteris. The 

 type of specialization of the male cerci similar to that developed 

 in certain species of Eremopedes. Male subgenital plate with 

 styles very greatly reduced. Prosternum unarmed. Lolies of 

 mesosternum and metasternum very weak. Liml) armament 

 weak. Cephalic tibiae with dorsal surface armed along external 

 margin with three spines. Caudal tiliiae armed distad with two 

 pairs of spurs, the small dorsal pair usually found in the allied 

 genera having disappeared, the ventral pair moved up the mar- 

 gin more than is usual and in consequence a greater distance 

 from the median pair. Plantula small, longer than broad, not 

 half the total length of the metatarsus. 



Oreopedes cryptoptera^'^ new species (PI. X, figs. 1, 2, 3, 4 and .5.) 



Though insignificant in appearance, this species, when critically 

 examined, is found to be one of the most interesting forms of the 

 North American Decticinae. This is due to the surprising com- 

 bination of characters and specialization exhibited. 



Type. — cf ; Silver Canyon Trail, White Mountains, Inyo County, 

 California. Elevation, 8300 feet. September 10, 1919. (M. 

 Hel)ard.) [Hcbard Collection, Type no. 555.] 



The following specific diagnostic characters are given, in addition to the 

 characters stated in the generic description. Size small for the Decticinae, 

 comparable to that of Idiostatus callimera here described. Form robust, but 

 moflcrately slender for the Decticinae, as in the above mentioned species. 



Vertex very slightly wider than proximal antennal joint. Pronotum 

 smooth, the metazona slightly over half the total length, transverse sulci 

 faintly indicated in dorso-lateral area only. 



Penultimate tergite rather large, briefly triangularly produced caudad on 

 each side and just witliin the (ierci, the apices of these jjroductions bluntly 

 rounded, the distal margin between the productions transverse, but the .sur- 

 face of the plate is weakly concave in an area a triangle would occupy, the 



"* From KpuxT^;; and TUTSpa = hidden wings. 



