73 



the vertex continuous with the frontal costa, which is slightly sulcata or flat; 

 tlie margins acute ; the lateral carinje slightly divergent. Antenna; but little 

 longer than the head, with about twenty joints; from the third joint tiattened 

 sub-triquetrous, acuminate at the apex. Eyes oval or sub-reniforni, oblique. 

 Pronotum truncate in front, angulate posteriorly, constricted behind the 

 anterior margin or parallel, tricarinate; tlie carinae distinct but not elevated, 

 the lateral inwardly angulate near the front, divergent posteriorly or parallel. 

 Prosternum unarmed, tumid in the middle. Elytra and wings present, gener- 

 ally as long as the abdomen, but sometimes shorter. Legs slender; the lour 

 anterior femora sub-compressed; the posterior femora much compressed, 

 dilate near the base. 



Division I (Sauss., Rev. et Mag. Zool., XIII, 1861, 314).— Tip of the 

 vertex sub-acute. Pronotum not constricted ; the posterior extremity obtuse- 

 angled ; the transverse sulcus situated behind the middle ; lateral carinas 

 acute, equal throughout, and in our only species parallel. 



©5. olb^cairiis, Thos., Geol. Surv. Terr. 1871, 466. 



Female. — Head conical; occiput ascending; the vertex ascending in the 

 same line with it, convex, with a slight median carina, most distinct in front ; 

 margins of the vertex slightly elevated, obtuse, and terminating behind at the 

 upper canthus of the eyes ; the vertex sub-conical; tip glabrous. Face quite 

 oblique, nearly straight ; frontal costa sulcate, parallel to the ocellus, below 

 which it gradually and regularly expands; lateral cariuse distinct, sharp, 

 curving slightly forward at the top in front of the eyes, nearly straight and 

 rapidly diverging below. Antennae somewhat ensiform, flattened, a little 

 longer than the head ; joints short. Eyes elongate, pyriform, acuminate 

 above, oblique. Pronotum a little longer than the head, tricarinate ; the 

 cariuai equal, distinct, and parallel ; sides compressed, perpendicular ; sul)- 

 truncate in front ; posteiior margin obtuse-angled ; transverse incision behind 

 the middle ; posterior lobe thickly covered with shallow punctures ; the 

 posterior lateral angle is a right angle. The elytra narrow, about three- 

 fourths the length of the abdomen. Wings nearly as long as the elytra. 

 Abdomen carined ; valves of the ovipositor obtuse, hairy on the margins, the 

 upper ones strongly curved. The legs slender; the femora compressed; 

 posterior femora nearly as long as the abdomen. 



Color (dried after long immersion in alcohol). — Pale rufous. Elytra 

 10 a 



