256 NEW NORTH AMERICAN DECTICINAE 



The male cerci agree in type with those of I. inyo here described, 

 representing a development very different from that found in 

 any other known species of Idiostatm. The male penultimate 

 tergite shows the least specialization of the known species of 

 the genus, and consequently we would place callimera first in linear 

 arrangement. 



Tijpe. — d^; Lone Pine Canyon, eastern slope of Sierra Nevada 

 Mountains, Inyo County, California. Elevation, 8400 feet. 

 September 8, 1919. (M. Hebard.) [Hebard Collection, Type 

 no. 550.] 



Size small for this genus, which includes very large and small forms. Form 

 slightly more slender than in inermis. Vertex very slightly wider than prox- 

 imal antennal joint. Pronotum smooth; disk rounding evenly into the lat- 

 eral lobes except in the produced caudal portion, where distinct rounded 

 shoulders occur, there as pronounced and slightly more sharply rounded than 

 in inermis; pronotum produced caudad a short distance, the lateral lobes 

 longer than wide, in this respect intermediate between inyo and inermis, the 

 degree of difference being slight. Lateral lobes of pronotum with caudal mar- 

 gin from the rather broadly rounded ventro-caudal angle straight, oblique, 

 then broadly convex, showing no humeral sinus; convex callosity opposite 

 straight portion moderately broad and feebly convex, sharply delimited along 

 its internal margin. Tegmina of same type as found in inermis, extending 

 beyond the pronotum almost the full pronotal length, with stridulating field 

 beyond stridulating vein exposed. Prosternum unarmed. 



Penultimate tergite small, simple, shorter than preceding tergite, caudal 

 margin broadly and weakly concave on each side, becoming slightly convex 

 meso-laterad at juncture with the triangular supra-anal plate, which is three- 

 quarters as long as the penultimate tergite, that segment with surface rather 

 deeply concave toward base of supra-anal plate but not subchitinous. Cerci 

 with shaft heavy, cylindrical, in length twice its basal width, dividing into 

 a distal and internal conical projection, the projections of like size'-^ and sim- 

 ilarly with apex armed with a sharp straight tooth, bent slightly inward from 

 the direction of the projection. Subgenital plate rather scoop-shaped, with 

 two heavy rounded carinae converging distad to the base of the small styles. 

 Styles cylindrical, two and one-half times as long as wide, separated by a dis- 

 tance twice as long as one of them; the caudal margin of the supra-anal 

 plate in this interval transverse, showing a very feeble concavity. 



Limbs moderately supplied with hairs, the sockets of these represented by 

 microscopic pits, this particularly noticeable on the dorsal surfaces of the 

 caudal femora. Femora with ventral margins unarmed, except ventro- 

 caudal margins of caudal femora, which are unarmed or with one (one to 

 three in the scries) spine, (ienicular lobes unarmed (occasionally with a 



'" Slight variation occurs, as is shown by the paratypes, in whicli tlie distal 

 projection varies from slightly larger to slightly smaller than liie marginal 

 projection. 



