Holotype male. Piceous, shining, form of arizonensis but slightly smaller. Clypeus narrowly emarginate and notched at centre of apex, head in front and on sides coarsely punctate; smooth behind, genae acute, prominent, coarsely and rather densely punctate; frontal horn long, arcuate, surface deeply pitted on sides and rear, front smooth. Thorax with a median protuberance triangularly emarginate at apex, the angles rounded and convergently apically; surface of protuberance slightly flattened, with distinct longitudinal impression, very coarsely and rather sparsely punctured at the centre; at each side near side margin a horn-like projection, the surface between these and the median protuberance deeply excavated and coarsely but rather sparsely punctate; between the usual short carina near the side margin and the horn-like projection is at about the middle a shallow fovea which is very coarsely punctured, surface of thorax coarsely punctate at margins, near front angles, and as noted above, the disc very finely and sparsely punctured; front angles obtusely subangulate, lateral margin near the front angles not sinuate, hind angles broadly rounded; fore part of thorax not tuberculate.