241 



on the front. Eyes piceous, elliptical, prominent. Antennse liright-red or 

 yellow, black at the base and toward the tips ; joints with black tips. Pro- 

 thorax thickly punctured, with a distinct testaceous keel and a prolonged and 

 testaceous hind border. Abdomen black; under side and pectus greenish. 

 Hind tibiae with two equal rows of spines. Fore wings pale-green, with 

 numerous black dots and points of various size. * Hind wings black, more or 

 less bright-red toward' the interior border, this hue extending to a patch in 

 the disk near the tip. 



Length of the body, 1,5 to 2 inches; expansion of the elytra, 3.1 to 3.25 

 inches. 



Most nearly allied to R. miles (Burm.), which may be distinguished from 

 it by the spots on the prothorax. 



Mexico, Oajaca (Walker). 



R. aiiricornif^, Walk., Cat. Dermap. Salt., Ill, 538. 



3Iale and female. — Luteous. Head thinly punctured, occasionally with 

 a brown patch on each side. Eyes piceous, elliptical, prominent. Antennae 

 bright-yellow, black toward the tips, Prothorax (pronotum) thickly punc- 

 tured, more or less tinged with brown on each side ; in structure like that of 

 eques; the keel with three notches, of which the hinder one is broad and 

 deep. Abdomen with two broad black bands, and with exterior black spots. 

 Femora and tibife black on the inner side ; the four anterior with a row of 

 black spots on the outer side ; hind femora with two rows of black spots on 

 the outer side ; hind tibiae with black spines ; tarsi black toward the tips. 

 Elytra with numerous black dots of various size ; extending nearly to the lip 

 of the abdomen in the male, rather shorter in the female. Wings crimson, 

 tessellated with black along the black border; a cinereous stripe in the disk. 



Length of the body, 1.5 to 1.83 inches; expansion of the elytra, 2.3 to 

 2.4 inches. 



Oajaca, Vera Cruz (Walker). 



XIPeOCERA, Biiriu. 



•Head, with the vertex advanced in the form of an obtuse cone ; vertex flat 



and triangular ; face vertical, middle costa single or double. Antennae long, 



setaceous, ensiform, consistin'g of 20 or more joints. Pronotum shagreened 



or rugose ; tour transverse-impressed lines more or less apparent ; the posterior 

 31 A 



