216 [DECEMBER^ 



defined ; at other times they are broad and subquadrate, so that the less elevated 

 interstitial spaces appear transversely rugous : the alternate intervals are some- 

 times very distinctly, and sometimes hardly apparently elevated, yet with a large 

 series of specimens these differences shade imperceptibly together. The in- 

 equalities of the thorax are much less conspicuous than in the following species, 

 and the four usual posterior tubercles are rather flattened. 



The synonym last quoted is not certain, yet as specimens occur in which the 

 sutural space is more distinctly elevated than the others, it would be safer to refer 

 it here, than to retain it as a species, without any distinct character. Trox cre- 

 natus and denticulatus (Oliv.) are described as South American species, and do 

 not appear to resemble those described under the same name by Beauvois. 



9. 0. mors us, sordidus (vel niger) thorace valde inaequali, Iateribus late 

 rotundatis, pone medium paulo incisis, angulis posticis late rotundatis, dorso 

 antice valde canaliculato, elytris seriatim crenato-punctatis, interstitiis alterna- 

 tim modice elevatis, interruptis (subtesselatis) tuberculis nitidis obtusis, alternis 

 tub^rculis minoribus noTatis. Long. -5 *55. 



Texas and Kansas. Very similar to the next species, and differs principally 

 in having the sides of the thorax distinctly incised a little behind the middle. 

 In well preserved specimens, the elytra would probably be tessellated, as in the 

 preceding species : between the large tubercles are seen rou^h places, as if for 

 the insertion of short bristles, precisely as in badly preserved specimens of Q. 

 punctatus : the smaller series of tubercles are sometimes hardly visible. The 

 inequalities of the thorax are very much elevated, and the four posterior tubercles 

 very distinct, the outer ones as usual being interrupted. 



10. 0. integer, sordidus (vel niger) thorace valde inaequali, Iateribus late 

 rotundatis, haud incisis, angulis posticis rotundatis, disco antice valde canalicu- 

 lato, elytris seriatim crenato-punctatis, interstitiis interruptis tuberculatis, alter- 

 nation magis elevatis. Long. -5 *53. 



Texas and Northern Sonora, near Tucson. As in some specimens the spaces 

 between the black tubercles are covered with a brown crust, the elytra are 

 probably tessellate in well preserved individuals. Besides the absence of the 

 lateral incision of the thorax, this species differs from the preceding by the tu- 

 bercles of the elytra being more closely arranged, and by the less elevated inter- 

 vals being more unequal. In one specimen, however, the intermediate rows of 

 small tubercles are almost obsolete. 



11. O. tesselatus, convexus, sordide cinereus, thorace inaequali, Iateribus 

 magis rotundatis haud incisis, angulis posticis paulo rotundatis, disco antice valde 

 canaliculato, elytris muricato-punctatis, crenato-striatis, interstitiis paulo con- 

 vexis spatiis quadratis nigris laevigatis, parum elevatis tesselatis. Long. *61 '65. 



This fine species is contained in the beautiful series of Coleoptera brought by 

 Dr. Thos. H. Webb from the boundary between Mexico and the United States, 

 and is labelled " San Diego trip" : for the purpose of completing the present 

 genus, the description is placed here, though it properly belongs to a paper to be 

 found below. 



The form of the thorax is similar to that of the preceding, but the elevations, 

 although very sudden, are smaller, and the anterior one is distinctly divided into 

 two longitudinal ridge?, the outer one, of course, being shorter; the elevations 

 of the elytra are nearly equal, except the sutural row, which is smaller. The 

 anterior tibiae are armed with a distinct tooth about the middle. 



Some corrections in. the Nomenclature of Coleoptera found in the United States, 



By John L. Le Conte, M. D. 



During the course of years through which our Coleoptera have gradually been 

 made known, too often under great disadvantages arising from the limited libra- 

 ries, and still more limited collections to be found in this country, many species 

 have been referred to wrong genera, and thus became placed in such relation to 



