410 G. R. CROTCH, M. A. 



Rh. notatUS, (Fabr.) Sp. Ins. i., p. 296, 26; Lee. I. c.— Elongate ovate, 

 light fulvous-yellow; head black, front and two dots on the vertex yellow; 

 metasternum black; thorax with a single discoidal medial patch black; elytra 

 irrorated with black, and two narrow yellow lines (representing the dorsal 

 punctures) ; tibiae obsoletely punctulate, with an abbreviated row of deep punc- 

 tures. L. -41 inch. 



% anterior tarsi broadly dilated, external claw extremely elongate and 

 broad ; intermediate claws unequal. 



Kansas. (Lecoute). 



Rh. tost us, (Lee.) Proc. Acad. (1866), p. 366.— Ovate, fulvous yellow, head 

 black, front fulvous; elytra thickly irrorated with black, suture narrowly 

 paler, L. - 4l inch. 



% anterior tarsi broadly dilated, claws visibly unequal, extremely elongate 

 and sub-sinuate. 



Missouri. (Leconte). 



Very close to C. exoletus Forst. but with the head black, (only the 

 clypeus being yellow) and the male claws slightly unequal. 



Rh. siiniiil us. Lee. 1. c. p. 522, 8. — Ovate, sub-depressed, black, antennae, 

 legs, sides of thorax and elytra rufo-piceous ;thorax with the base deeply sinu- 

 ate, so that the posterior angles are produced and acuminate; the surface finely 

 granulate, the inner row of dorsal punctures tolerably well marked; posterior 

 tibiae smooth with a single row of deep punctures. L. '40 inch. 



% . — Intermediate claws unequal, anterior sub-equal, the external sinuate. 



Dacotah, Illinois. Evidently closely allied to C. Grapii. 



B. — Intermediate claws of male equal. 

 Rh. atricolor, Aube, Sp., p. 265. — Broadly oval, black, not very shining, 

 head with the front and two spots on the vertex fulvous entirely covered with 

 fine irregular anastomosing striolae, not forming areolae; thorax short, sides 

 nearly straight, hardly margined, anterior angles produced, base sub-sinuate; 

 elytra with the three dorsal striae regular, well marked, punctures distinct; 

 under surface nearly smooth, presternum carinate, posterior femora smooth, 

 tibiae with one accessory row of large punctures. L. "60 inch. 



% four anterior claws equal. 



New Mexico, (Leconte, Horn). Mexico, (Aube). 



Rh. calidus, (Fabr.) Ent. Syst. i., 193; Lee. 1. c. n. 23.— Ovate, sub-con- 

 vex, above dark brown, shining ; sides of thorax paler ; elytra with a sub-basal 

 transverse line, three narrow vittae on each, and the lateral margin pale. L. 

 •50 inch. 



% four anterior claws equal. 

 Georgia, (Leconte). 



Rhantus? consimilis. Mots. Bull. Mosc. (1859), p. 47, 50.— Elongato 

 ovatus, depressiusculus, subnitidus, supra subtilissime rugulosus, uigropiceus, 

 ore, palpis, antennis, thoracis, elytrorumque margine dilutioribus ; capite sub- 

 triangulare, antice oblique bi-impresso; thorace transverso, antice angustato, 

 basi arcuato, lateribus marginatis, subretiexis, angulis anticis prominulis, pos- 



