28 [February, 



by the thorax being broader and less narrowed anteriorly, and by the strise of 

 the elytra being very strongly punctured ; C. consimilis Lee. appears to be 

 merely a variety in which the head and thorax are slightly coppery, and the 

 latter is not narrowed toward the base. 



27. C. Nebraskensis, subtus niger, supra viridi-aeneus, pubescens, capite 

 subtilissime punctulato, thorace latitudine breviore, baud convexo, lateribus 

 rotundatis utrinque paulo angustato, sat dense punctato, ad basin utriuque longe 

 impresso, angulis posticis obtusis ; elytris obscurioribus striis tenuibus antice 

 subtilius punctatis, interstitiis planissimis subtiliter punctulatis, pedibus palpis- 

 que rufis, antennis piceis articulis tribus baseos rufis, 3io sequente haud longiore. 

 Long. -45. 



Yellowstone River, Dr. Ilayden : Santa Fe, Mr. R. C. Kern. Differs irom the 

 neighboring species by the more finely striate elytra ; in a dorsal view in fact 

 the outer striae appear almost obliterated. 



28. C. gl au c u s , subtus niger, supra obscure viridi-aeneus, pubescens, capite 

 subtilissime punctulato, thorace latitudine paulo breviore, subquadrato, utrinque 

 subangustato, lateribus modice rotundatis, vagius et profunda punctato, ad basin 

 utrinque longe impresso, angulis posticis subrectis, elytris obscuris, vel atro- 

 cyaneis, striis punctatis, interstitiis fere planis, subtiliter punctulatis, pedibus 

 palpisque rufis, antennis piceis, articulis tribus baseos rufis, 3io haud longiore. 

 Long. -44 -54. 



Colorado river, near the junction of the Gila. Larger than the neighboring 

 species, and known by the more quadrate thorax, being less densely punctured. 



30. C. asperulus 3Ienetries, Bull. Soc. Imp. St. Petersb. 2, 55. Baron 

 Chaudoir informs me that C. obscurus Lee. Ann. Lye. 5, 179, belongs to this species. 

 The color varies, so that the head sometimes becomes greenish bronzed, as de- 

 scribed by Menetries. The antennas are sometimes entirely black, and some- 

 times the first joint is reddish brown. The feet vary in color from rutous to 

 black. The thorax is slightly narrowed, both at the apex and base, but cannot 

 be called cordate. The thorax is described by Menetries " cordato, profuude sed 

 vage punctato," and I should not venture to refer his to my species, were it not 

 for the direct comparison made by my learned and accurate correspondent, Barcn 

 Chaudoir. This discrepancy in the description leads me to believe that C. var.- 

 abilipes Esch. must also be referred here : it being premised that not only does 

 the color of the legs and antennas vary, but even the punctures of the thorax, 

 are sometimes very strong, (though never dense, as described by Eschscholtz), 

 and the fine punctures of the interstices of the elytra are at times less distinct. 



The description of Eschscholtz (Zool. Alas 5, 27), is as follows: 



" Niger pubescens, capite lisvi, thorace subviolaceo, punctatissimo, basi coarc- 

 tato ; angulis productis ; elytris obsolete punctulatis, striis profunde ])unctatis, 

 antennarum basi pedibusque aut rufo-testaceis aut nigris. Long. 5J lin. 



" San Francisco. Head black, almost imperceptibly rugous. Thorax wider 

 than long, somewhat rounded on the sides, narrowed near the rectangular pro- 

 minent posterior angles ; disc dark blue, thickly covered with large but not deep 

 punctures, hairy with brown pubescence, with two longitudinal impressions at 

 the base. Scutellum black, smooth, shining. Elytra clothed with brown hair, 

 opake black, very finely and not obviously punctured ; humeri not prominent ; 

 strias fine, and strongly punctured on the anterior half. Antennse and legs :of 

 one specimen black, palpi with the last joint red, cylindrical : in the other speci- 

 men, a female, the two basal joints of the antennae, the whole of the palpi, 

 and the feet are red : the third joint of the antennae is of the same length as the 

 following." 



The description of Menetries reads thus : 



" C. asperulus, obscure aeneus, rufo-pubescens ; capite laevi, viridi-cupreo, 

 thorace cordato, ])rofunde sed vage punctato ; elytris striatis, striis forte 

 punctatis, interstitiis subtilissime asperatis ; antennis pedibusque nitide nigris, 

 palpis rufis." 



