Compsus (Compsus) auricephalus Say 1824

Length 7 4/5—12½, breadth 2 2/3—5 millim. (♂ ♀.)

More elongate; the elytra more produced and acuminate at the apex, the alternate interstices costate throughout; the vestiture white, greenish, or pale brown.
 
Length 9 1/10—16¾, breadth 3—6½ millim. (♂ ♀.)

Hab.NORTH AMERICA, Mississippi¹²⁴⁶⁷, Arkansas, Georgia³, Texas⁴⁵, Arizona⁴.— MEXICO³⁶⁷ (Mus. Brit.), Monclova in Coahuila (Dr Palmer), Victoria, Tampico (Schwarz, in U. S. Nat. Mus.), San Rafael Jicaltepec (Townsend, in U. S. Nat. Mus.), Oaxaca (Sallé, Höge).

Hab.MEXICO, Acapulco (Höge); GUATEMALA, Tactic in Alta Vera Paz (Conradt); NICARAGUA, Chontales (Belt); COSTA RICA, Boca del Limon (Pittier), Cangrejal de Aserri (Biolley), Atenas (U. S. Nat. Mus.); PANAMA, Caldera, Peña Blanca (Champion).

The specimens of this species before me (including a long series from Tampico) vary greatly in size and in the colour of the scales—from green to white or pale brown, the head, rostrum, and legs being often cupreous in the green typical form. The southern examples are more elongate, uniformly white or brownish*, and have the alternate elytral interstices 3, 5, and 7 strongly costate and the apices more produced; but they are connected with C. auricephalus by intermediate forms. The prothorax is trisulcate, and often more widened posteriorly in the female than in the male; the eyes, too, are sometimes rather depressed in the former sex. Found on Phoradendron, Ambrosia, Gossypium, and Acacia⁵.* Probably discoloured, as may be the case in C. isabellinus, Boh.

Var. More elongate; the elytra more produced and acuminate at the apex, the alternate interstices costate throughout; the vestiture white, greenish, or pale brown.