474 REVISION OK THE ELATBRIDjE 



Georgia. I have only males. The smooth but not impressed dorsal line distinguishes 

 this from the allied species. The sides of the thorax are thickly, the disc less densely, 

 punctured ; the posterior angles have two distinct carinas In one specimen, which is 

 possibly a distinct species, the thorax is less convex, and with the exception of the dorsal 

 line is equally and densely punctured. 



5. C. i n c e r t u s , piceus, fusco-pubescens, fronte concava, thorace antrorsum a basi angustato, 

 Iatitudine vix breviore, lateribus late rotundatis, crebre punctato, postice subcanaliculato, elytris sub- 

 parallelis, striis impressis punctatis, interstitiis subtiliter rugose-punctulatis, antennis pcdibusque cas- 

 taneis, illis articulo 3'° 2 nd0 duplo longiore, (maris lanuginosis, feminoe pubescentibus.) Long. -61 — -75. 



Missouri Territory. The sides of the thorax in one male are nearly straight; in the 

 females they are broadly rounded: the elytra are very slightly narrowed from the base in 

 the males, while they are parallel in the females. This species is very similar to the next, 

 and is only to be distinguished by the more gradually rounded sides of the thorax. The 

 posterior angles are bicarinate. 



6. C. decumanus, piceus, fusco-pubescens, fronte concava, tborace Iatitudine fere breviore, la- 

 teribus postice fere parallelis antice rotundatis, crebre grossius punctato, postice vix canaliculato, ely- 

 tris parallelis, striis impressis punctatis, interstitiis punctulatis, antennis (maris longius, feminre sub- 

 tilius) pubescentibus, articulo 3'° 2 ndo duplo longiore. Long. -68 — -73. 



Ericbson, Germ. Zeitschr. 3, 104. 



Maryland, Prof. Adams. Although differing but slightly in appearance from the pre- 

 ceding, the antennas of the male are not covered with erect hairs, but with prostrate 

 hairs, longer than those seen in the female. The inner carina of the posterior angles of 

 the thorax is distinct. 



One female differs in having the punctures of the interstices of the elytra very distinct. 



7. C. clandestinus, niger, subtiliter cinereo-pubescens, fronte concava, thorace Iatitudine lon- 

 giore, elytris vix latiore, lateribus fere parallelis antice late rotundatis, confertim subtilius punctato, 

 postice breviter canaliculato, elytris parallelis, striis punctatis, interstitiis subtiliter rugose punctula- 

 tis, antennis lanuginosis piceis articulis 2 et 3 parvis aequalibus, pedibus rufis. Long. -32 — -37. 



Erichson, Germ. Zeitschr. 3, 112. 



Middle and> Southern States. 



8. C. s e cr e tus , niger, nitidus, pube subtili atro-griseo vix couspiuua vestitus, fronte late con- 

 cava, fortius marginata, thorace Iatitudine longiore lateribus parallelis antice rotundatis, minus con- 

 vexo, disperse punctato, postice breviter canaliculato, elytris thorace vix angustioribus parallelis, striis 

 profunde punctatis, interstitiis disperse punctulatis, pedibus antenniscrue rufis, his breviter lanuginosis, 

 articulo 3'° 2"' lu paulo longiore. Long. -32 — -41. 



Georgia. The carina of the posterior angles of the thorax is very long, very close to 

 the margin, and parallel with it. The form of the thorax causes this species to resemble 

 the preceding, but its characters are very different. It, however, forms the passage from 

 the species having the front concave, to those with the front flattened or convex. 



9. C. i g n o b i 1 i s , fusco-piceus, elongatus, griseo-pubescens, fronte plana, margiue subreflcxo, tho- 

 race Iatitudine subbreviore antrorsum paulo angustato, lateribus rectis, minus convexo, sat dense punc- 



