144 C. ZIMMERMANN, M. D. 



C. pulicarius Zimm. — Long, i lin. Brown or ferruginous, antenna and feet 

 yellow; head thickly punctured, with a slight impression upon the front, an- 

 terior margin thickly fringed with long yellow hair; prothorax somewhat longer 

 than wide, roughly tuberculate in front, thickly and finely punctured behind ; 

 elytra strongly punctured, but not in rows, impressed along the suture behind 

 the middle, the tip rounded. [Dr. Zimmermann refers to this species T. pusil- 

 lus Harris Trans. Hartford Nat. Hist. Soc, I, 82, but it appears to me to belong 

 rather to C. minutissimus. In any event the name must be changed as it was 

 previously used for a European species, now belonging to the genus Cryptargus. 

 — Lec] 



C. punctatissimus Zimm. — Long. IJ lin. Short thick, compressed, shining 

 black, antennjB and feet ferruginous; front glabrous; prothorax roughly tuber- 

 culate in front, shining behind, with fine sparse punctures; elytra punctured 

 strongly, but not in rows, behind rounded, without furrows or teeth. — South 

 Carolina. [This species is the type of Erichson's genus Corthylus, and is usually 

 regarded as Bostrichus compressicornis Fabr., but probably without sufficient 

 reason, the locality of that insect having been given as South America. — Leg.] 



C. — Prothorax above nearly circular; anterior femora slender. 



C. dissimilis Zimm. — Long. 1 lin. Stout, elevated, black, antennje and feet 

 yellow; front clothed with fine silky hair; prothorax not longer than wide, 

 strongly convex, thickly punctured, finely pubescent, before the middle marked 

 with erect acute spines; elytra cylindrical, punctate-striate, finely pubescent 

 with gray hair, rounded at the tip. — North Carolina. [I have sjjecimens of this 

 species from the Southern States and Lake Superior; the intervals between 

 the elytral rows of punctures are finely and sparsely punctured. — Lec] 



XYLEBORTJS Eichhofif. 

 In the species of this group the tibiae are strongly compressed and 

 dilated ; the body is cylindrical, obliquely truncate behind or flattened, 

 or marked near the suture with two or more small teeth or tubercles. 

 According to differences in the form of the body the following divisions 

 may be established. 



A. — Middle and hind tibiiB rounded on the outer margin, finely ser- 

 rate; prothorax strongly convex. 



X. tachygraphus Zimm.— Long, li lin. Brown, antennse and feet ferruginous 

 yellow; prothorax not longer than wide, roughly tuberculate, more coarsely 

 in front than behind, thinly pubescent; elytra short cylindrical, behind ob- 

 tuselj'^ rounded, punctate-striate, the intervals also punctured, with fine rows 

 of hairs, and behind also with suiall elevated teeth. — North Carolina. [This 

 species is also found in Pennsylvania. — Lec] 



X. ■pYTi.=^Scoli/tus pr/ri Peck, Mass. Agr. Journal, 1817. — Long. IJ lin. Of the 

 same size and form as X. tachygraphus, but of a shining black color, with the 

 antennse, tibise and tarsi ferruginous yellow ; prothorax covered in front with 

 sharp tubercles arranged in transverse rows, behind nearly smooth; the whole 

 surface is thinly clothed with fine white hairs; elytra punctate-striate, ob- 

 liquely flattened behind, the intervals finely punctured and pubescent, the 7th 

 acutely elevated towards the tip. — Massachusetts. [Also found in Pennsyl- 



