AMERICAN COLEOPTERA. 145 



vania; the elevation of the 7th interval forms the acute margin of the apical 

 oblique declivity of the elytra, and also exists in the preceding species; it is 

 however somewhat serrate in that, but quite entire in the present. — Leg.] 



X. [celsus Eichh. Berl. Ent. Zeitsohr. 1367, 400.] — Long. 2 lin. Ferrugi- 

 nous, clothed with yellow hair; entirely of the form of the Eurojiean X. mono- 

 graphus, but larger, and distinguished by the elytra being obliquely declivous 

 behind,perfectly flat, smooth, with two larger acute pointed tubercles each side 

 near the suture, and near the edge of the declivity with many smaller acute 

 elevations.— South Carolina. [This species is also found under oak bark in the 

 Northern States. It differs from the two preceding species by its much more 

 elongate form, the prothorax being about one-half longer than wide, with the 

 sides parallel behind the middle and the elytra more than one-half longer than 

 the thorax. — Lec] 



X. [fuscatus Eichh. Berl. Ent. Zeits. 1807, 400.]— Long. 1— U lin. Ferruginous 

 brown, or yellow, thinly clothed with gray hair, with the same form and sculp- 

 ture as X. monographus, but somewhat smaller, and distinguished by the oblique 

 declivity of the elytra being marked by only a single large acute tubercle, while 

 the suture itself is also distinctly elevated. This and the allied species X. mono- 

 qrafhus and celsus are found under oak bark. — Atlantic States. [ I observe in the 

 typical specimens, besides the large acute tubercle mentioned, three or four 

 very small denticles in the upper part of the declivity of the elytra. A nearly 

 allied species having two smaller tubercles each side near the tip of the elytra 

 was found by me under pine bark in Georgia, and is described in the appendix 

 to this paper. — Lec] 



X. xylographus. =-Bos<ri;cAus xylogr. Say, Journ. Acad. Nat. Sc. v, 256. — Long. 

 li lin. Ferruginous, with yellow hair, of the form and sculpture of X. mono- 

 graphus, but smaller, and differing by the oblique declivity of the elytra being 

 rounded, and marked with rows of very small denticles ; the suture is not ele- 

 vated as in X. conformis. — Atlantic States. X.ferrugineus Fabr. from Cuba, is 

 a very similar and closely allied species, with which this must not be con- 

 founded. 



X. pubescens Zimm. — Long. 1 lin. Ferruginous, elytra brown, antennse and 

 feet yellow; of the form of the preceding, but narrower; the prothorax is lon- 

 ger than wide, roughly tuberculate in front, smooth behind, clothed with very 

 fine white hairs; elytra finely punctate-striate, the intervals each with a row 

 of erect hairs; posterior declivity rounded, and marked with small denticles 

 on the slightly elevated 1st and 3rd intervals. — Southern States. [A close ex- 

 amination shows two smaller denticles towards the tip on the 5th interval. 

 This species is closely allied to X. xylographus, but differs by the punctures of 

 the elytra being larger, and the hairs longer, the small punctures of the hind 

 part of the thorax are also more evident, and the denticles of the posterior de- 

 clivity of the elytra are fewer, being scarcely more than two on each of the al- 

 ternate intervals. — Lec] 



B. — Middle and hind tibiae as in division A ; protliorax at least in 



the males, impressed or deeply excavated in tront. 



X. planicoUis Zimm. — Long. 1 lin. Ferruginous; front smooth and flat; pro- 

 thorax with a shallow impression, almost as wide as long, very finely and 

 thickly punctured, and clothed on its anterior half with fine silky hair ; elytra 



