SCUDDER. — NORTH AMERICAN TRYXALTN.E. 47 



c^. Lateral lobes of pronotum convex above, except for the carinae passing 

 rather gradually into the disk ; lateral carina} divergent on metazona ; tegmina 

 nearly or quite as long as tlie abdomen, at least in the male. 



Clinocephalus Morse. 

 a-. Antenna) long, about or more than half as long again as head and pronotum 

 together ; fastigium of vertex with a median carina ; scapular area of tegmina dis- 

 tinctly dilated, at least in the male. 



61. Antennae basally depressed but not expanded, subcqual to near the tip ; face 

 moderately oblique, the frontal costa subobsolete below the ocellus; lateral 

 foveola? of vertex obsolete ; pronotum posieriorly truncate, the lateral lobes as 



deep as long Chloealtis Harr. 



6-. Antennae basally depressed and expanded, tapering in the proximal half; face 

 strongly oblique, the frontal costa percurrent and sulcate below the ocellus; 

 lateral foveolae of vertex distinct, linear; pronotum posteriorly obtusangulate, the 

 lateral lobes longer than deep (Eonomus gen. nov. 



CEonomus (oi'ocoVos) gen. nov. 



Of slender foi-m. Head somewhat prominent, subconical, the face 

 strongly oblique ; fastigium of vertex triangular with rounded subrec- 

 tangulate apex, plane above with feebly raised blunt margins and a 

 median carina, the lateral foveola^ distinct, linear, invisible from above ; 

 frontal costa percurrent or almost percurrent, sulcate except in the 

 uppermost siibvertical portion ; eyes long-oval, oblique, not distant above ; 

 antenna? half as long again as head and pronotum together in the male, 

 nearly as long as that in the female, the proximal half beyond the second 

 joint depressed, expanded and tapering, in the male broader, at broadest, 

 than the interspace between the eyes, at extreme tip again tapering 

 slightly, at least in the male. Pronotum compressed, the disk nearly 

 plane, faintly tectate, with parallel sides, the lateral and median carina? 

 similar and parallel, the front margin gently convex, the hind margin 

 broadly obtusangulate, the lateral lobes vertical but gently rounded, 

 longer than deep. Tegmina shorter than the body, apically subangulate, 

 the scapular area expanded and scalariform in the male ; wings aborted. 

 Hind legs slender, the femora surpassing the abdomen, the inner spurs of 

 hind tibia? equal. 



CEonomus altus sp. nov. 



Testaceous with a lateral blackish fuscous stripe of variable width, but 

 generally broad and deepest in color above, extending from behind the 

 eyes across the pronotum, limited above by the lateral carina and con- 

 tinued upon the closed tegmina ; otherwise devoid of markings except 

 usually for a pair of feeble and obscure diverging fuscous stripes on the 



