REHN AND HEBARD 251 



quite similar, the ovipositor of idus is of the normal type but 

 averages decidedly longer and distinctly broader than in cincreus. 

 When compared with spinosus the present species is found to 

 differ in the more robust structure, much more truncate form, 

 very much more quadrate lateral lobes of the pronotuni, longer 

 stridulating vein of male tegminal tympanum, different colora- 

 tion and very different genitalic characters of l)oth sexes. The 

 species is decidedly variable in several usually very constant 

 characters for the species of the genus. 



Size medium to large, form very robust. Vertex not strongly 

 but distinctly ascending. Fastigium of vextex broad, greatest 

 width fully that of proximal antennal joint .^^ one and one-half 

 times as deep as wide, narrowing with a distinct concavity to 

 facial suture. Eyes of medium size, moderately protruding. 

 Lateral lobes of pronotum rather broad, cephaUc margin straight 

 to the broadly rounded ventro-cephalic angle, then straight and 

 more nearly horizontal than usual to the sharply rounded nearly 

 rectangulate ventro-caudal angle, caudal margin distinctly but 

 weakly convex to the shallow humeral sinus, convex callosity mod- 

 erately broad and distinct. Tegmina normally semi-brachyp- 

 terous, reaching distal extremity of male abdomen and covering 

 about two-thirds of female abdomen, broad, \^dth distal portion 

 narrowing rather sharply and immediate apex sharply rounded. 

 We have before us several specimens in which the tegmina are 

 unusually truncate and in these the immediate apex is very 

 broadly rounded. Rarely specimens are macropterous. i\Iale 

 tegminal tympanum very large, not elongate, stridulating vein 



50 A series of four cf , one 9 and one juv. 9 from Texolo, Vera Cruz, Moxico» 

 have the vertex unusually narrow, two-thirds the width of the i)n)xunai 

 antennal joint in the males and about four-fifths the width of the same m 

 the females, with sides, as would be expected, less concave, 'fhe specimens 

 are otherwise inseparable from other smaller indivi(hials of the species. 



TRANS. AM. ENT. SOC, XLI. 



