AMERICAN COLEOPTFRA. 409 



RH.41VTUS, Eseh. Dej. Cat., p. 62. (Type coUavis.) 

 Thorax with the sides margined : metasternurn emarsrinate, broad, 



laein ; ae sub-trian»ular, narrowed towards the apex, epistema reaching 



the coxae; posterior femora simple at the apex, last joint of posterior 



tarsi as short as the fourth, claws unequal. 



£ . — Pour anterior tarsi compressed, dilated, beneath with four 



transverse rows of discs, claws generally unequal. 



A.— Intermediate rlaws of mate, unequal. 

 Rh. banofatus, (Harris), N. E. F. vii , lfi4; (Lee.) Proc Phil. (1862), p. 

 523, 2<i.— Ovale, rather convex, black, front of head, presternum, legs and sides 

 of ventral segments fulvous; thorax fulvous with a diseoidal black fascia 

 divided bv a narrow line in the centre, sides straight; elytra finely granulate, 

 margin narrowly fulvous, disc thickly irrorated with black; posterior tibi.-e 

 with the base punctate and a row of deeper punctures reaching the apex. 

 L. -47 inch. 



% anterior claws sub-equal, external sinuate, rather elongate. 



Middle States and Canada, Mexico (Aub<§). Nevada, New Mexico, 

 Hudson's Bay, Lake Superior, Kansas. 



Allied to Rh. pn'op.rosn* of Europe, but % claws subsqual, 



Rh. dJvisus, (Aube) Spec, p 2+8; (Lee.) 1. c. n.. 21.— Closely allied to C. 

 bin^atus, presternum black with the carina yellow; posterior legs nearly 

 black, tibiae clearly punctate. 



% anterior claws equal, sinuate at the base, intermediate very unequal. 



Rh. an Noil yell as, sp n. — Externally resembling C. binotatus. prester- 

 num md »as M>f the fe nora black, male interior le £3 lefor ne I, the tibi;e short, 

 <J cply excavate for the tarsi, the claw joint elongate, the external claw twice 

 the length of the oth -r. 



Rh. flavog;r:sens, ?p. n. — Again allied to C. binotatus but more elongate, 

 narrower, the iliscal spots on the thorax transversely quadrate, beneath black, 

 prosternal carina pale, femora black. 



% anterior claws elongate sub-equal, sinuate, intermediate internal claw 

 rudimentary. 



Rh. bistriatns, (Berg.) Nom. i., p. 42, t. 8. f. 5 ; agilis % (An be - .) Spec, p. 

 251: suture/ fas, (Harris) N. F. vii. p. Hit. — Rather shortly ovate, black, head in 

 front and on ihe vertex fulvous: thorax fulvous, bordered with black before 

 and behind, elytra irrorated with black : prosternum and Pour anterior legs 

 pale: posterior tibiae smooth with three deep punctures towards the base. L. 

 -40 inch. 



% anterior tarsi dilated, claws equal, very elongate, sub-sinuate; intermediate 

 claw- unequal, the external one very broad, compressed. 



Hudson's Bay, Lake Superior, Kansas, Slave Lake. 



