NATURAL SCIENCES OP PHILADELPHIA. 53 



rately Insinuate at base; the elytra are striate and ovate, but longer than in 

 the preceding group; the first joint of the anterior tarsi of the male is hairy 

 beneath only for a small portion near the anterior margin ; the 2d joint has the 

 usual brush of hair; the 3d and 4th joints are entirely without hair. 



7. C. Sayi DeJ. The middle tibiae of the male are very much curved, pro- 

 longed at tip on the inner face, and armed along the inner margin with several 

 small distant teeth. 



Group IV. 

 In this group are several species of a black color, with feeble or obsolete 

 elytral striae ; the outer joints of the antennae are cylindrical and equably punc- 

 tured ; the thorax is narrowed behind, sometimes angulated at the sides, with 

 the base not at all emarginate, but truncate or slightly rounded ; the joints 1 3 

 of the anterior tarsi of the male are clothed beneath with a dense brush of hair 

 the 4th is naked; nothing peculiar is seen in the form of the middle tibiae of 

 the male. All the species inhabit the plains of the central part of the continent 



8. C. prominens Lee. (angulalum\\ Lee.) ; 9. C. 1 it g u b r e Lee. 



10. C. carbonatum, nigrum, subnitidum, thorace latitudine duplo bre- 

 viore antice posticeque angustato, lateribus medio obtuse subangulatis ; disco 

 confertim subtiliter intricato-rugoso, lateribus parce punctatis, basi fere recte 

 truncato, elytris subovatis, convexis, thorace latioribus, striis haud impressis 

 subtiliter punctatis, foveisque obsoletis serie triplici impressis. Ljng. 1-00. 



New Mexico and Upper Texas. 



11. C. t r i s t e Lee. ; 12. C. o b s o 1 e t u m Say, {luxatum\ Dej.) 



Group V. 

 The species here placed have the outer joints of the antennae nearly cylin- 

 drical but less punctured on the sides ; the thorax is more or less narrowed 

 behind, and the base is distinctly emarginate; the joints 1 3 of the anterior 

 tarsi of the male are clothed beneath with a dense brush of hairs, and the 4th 

 is glabrous ; the middle tibiae of the male present no important characters. 

 There is much difference in the sculpture of the elytra, the striae being oblite- 

 rated in C. s e m i 1 ae v e , deep in c a 1 i d u m , confused in tepidum, badly 

 defined in cancellatum, which has besides three rows of catenated eleva- 

 tions. All the species are found on the Pacific coast; C. c a 1 i d u m extends 

 entirely across the continent from ocean to ocean. 



13. C. s e m i 1 ae v e Lee. ; 14. C. calidum Fair. (var. lepidum Lee.) ; 15. 

 C. tepidum Lee. 



16. C. cancellatum Esch. (var. cenescens Lee.) 



Group VI. 



In this group are placed species without wings, and generally of robust 

 form; the outer joints of the antennae are somewhat compressed and very con- 

 spicuouslj 7 less punctured on the flattened sides, except in C. discors, in 

 which the antennas resemble those of the preceding group ; the thorax is nar- 

 rowed behind, and the base is very obviously emarginate; the joints 1 3 of 

 anterior tarsi of the male are clothed beneath with a dense brush of hairs, and 

 the 4th is glabrous ; nothing remarkable is seen in the middle tibiae of the 

 male. 



Four forms of elytral sculpture are seen. 



a. Elytra with rows of close set punctures, the intervals each with a row of 

 more distant punctures. 17. C. discors Lee. 



b. Elytra with confused punctures and three rows of catenated elevations. 

 18. C. moniliatum Lee. 19. C. laqueatum Lee. 



c. Elytra with confused punctures and three rows of faint foveae. 20. 0. 

 W i 1 k e s i i Lee. 



d. Elytra with fine striae, the intervals crossed by transverse lines producing 

 an imbricated appearance. 21. C. luxatum Say. (C. slriatulum Lee. and 

 C. Zimmermanni Lee. are varieties, or rather races, of this species.) 



1862.] 



