168 DERMAPTERA AND ORTHOPTERA FROM SINALOA, MEXICO 



caiidad of the pronotum, tegmina with iinbranched discoidal vein 

 and longitudinal discoidal sectors, wings with unbranchcd dis- 

 coidal and straight ulnar vein, dorsal surface of the abdomen with 

 median segment specialized mesad and ninth tergite with pro- 

 duced latero-caudal angles, nearly symmetrical male su])gcnital 

 plate with simple, similar styles but armed distal margin, large 

 pulvilli and arolia and very strongly asymmetrical tarsal claws. 



In linear arrangement we place this genus after Syinploce in 

 the Group Ischnopterae. 



Genotype. — Cahita nahua (Saussure). 



Generic description. — Size medium for the group, form Inroad, 

 texture moderately delicate, in this latter respect as in Symploce. 

 Interocular space moderately broad, ocellar areas weakly de- 

 fined. Maxillary palpi short and heavy, fifth joint specialized. 

 Pronotum broad, evenly and weakly convex, caudal margin 

 broadly rounded obtuse-angulate produced, point of greatest 

 width meso-caudad. Tegmina and wings fully developed in 

 both sexes. Tegmina moderately broad, discoidal vein un- 

 branched, discoidal sectors (nine to ten) longitudinal. Wings 

 with mediastine vein extending to beyond median point, dis- 

 coidal vein unbranched, costal veins slightly thickened distad, 

 not cluljbed, ulnar vein straight with (four) incomplete and 

 (five) complete branches, intercalated triangle very small. 

 Abdomen of male with median segment specialized and ninth 

 tergite with latero-caudal angles decidedly produced. Supra- 

 anal plate triangularly produced in both sexes. Sul)genital 

 plate of male symmetrical, with simple similar styles, distal 

 inargin armed. Limbs rather stout for the Group. C'ephalic 

 femora with ventro-cephalic margin armed with (four or five) 

 heavy proximal spines, succeeded by a scattered, irregularly 

 placed row of minute, chaetiform spines, terminated by two 

 elongate, heavy spines, of which the more distal is the longer 

 (these latter sometimes absent). Other ventral femoral mar- 

 gins supplied with elongate, heavy spines. Tarsi compara- 

 tively stout and covered with minute but coarse hairs, first 

 four joints supplied with lai-ge ))ulvilH distad. Very large 

 ai'olia present between the slout, unspecinJized, strongly asym- 

 metrical tai'sal claws. 



