203 



exteriorly convex. Elytra passing the abdomen. Wings somewhat fus- 

 cous, yellowish at the base. Posterior femora slender. Antennae of the 

 female flattened, dilate; of the male sub-crassate, acuminate; joints conspic- 

 uous. 



Length, 0.83 inch. 



Mexico (Saussure). 



©. aztecn!«, Sauss., Rev. et Mag. Zool., XIII (1861), 315. 



Quite small, fuscous. Body varied with fuscous and bay. Closely allied 

 to O. mexicanus; very similar in stature and form, but the antennae elongated; 

 apex scarcely acuminate, and the head more deflexed. Lateral carinse of the 

 pronotum less divergent posteriorly, and scarcely arcuate. Elytra longer, 

 black ; a vitta upon the posterior margin green ; anterior field of the wings 

 not parted by the longitudinal vein, hyaline ; the transverse nervures widely 

 separated. Body fuscous, ornamented above with a green fascia. Head 

 testaceous. 



Mexico (Raussure). 



O. totonacii!!!, Sauss., Rev. et Mag. Zool., XIII (1861), 315. 



Green, with two yellow lines running from the eyes along the carinse of 

 the pronotum. Very much like O. mexicanus in size and form, but less com- 

 pressed. Antennae filiibrm, somewhat crassate, those of the female shorter 

 than the head and pronotum united. Rostrum of the vertex excavated, 

 marked with a transverse sulcus. Dorsal area of the pronotum broader, 

 strongly tricarinate ; lateral carinse cut by the second and third transverse 

 furrows, or by all three, slightly divergent posteriorly, arcuate inward, as in 

 O. toltecus. Elytra much longer than the abdomen, sub-membranaceous, 

 fuscous ; apex rounded ; marginal areas green, opaque ; anterior area spotted 

 with gray, and a sub-basal sinus gray; a series of fuscous spots along the 

 disk. Wings fuscous at the apex. 



Mexico (Saussure). • 



©. zapotecm, Sauss., Rev. et Mag. Zool., XIII (1861), 316. 



Quite small, moderately compressed. Rostrum of the vertex flat, sub- 

 excavated, a narrow, transverse sulcus at the base ; margins scarcely elevated. 

 Antennae flattened. Face deflexerl; but not arcuate; frontal costa above the 



