158 JOHN L. LE CONTE, M. D. 



of tte specimen permits an examination, the funiculus appears to be 

 4-jointed. 



XYLOTERUS Er. 



In this genus the club of the antennsB is large, pubescent, oval, 

 solid and not at all annulated, with a somewhat smooth elongate spot 

 estendiug from the base to the middle ; the funiculus is 4-jointed, 

 and the eyes are so deeply emarginate as to become completely di- 

 vided. 



No species of this genus is contained in the collection of Dr. Zim- 

 mermann, and the name was applied by him to some species not sepa- 

 rated by Erichson from Tomicus;, but which now form the genus Xj/le- 

 borus Eichh.; I have taken the liberty of substituting the latter name 

 in his MSS. 



Mr. A. Puton* observes that the European species of this ge- 

 nus do not make their galleries between the inner bark and the 

 wood, as is the case with nearly all the insects of this family, but bur- 

 row deeply into the wood itself, thus greatly injuring the value of the 

 trees which they attack. Our species, without doubt, will be found to 

 have similar habits. 



1. X. retusus. — Cylindrical, rather stout, blackish brown, shining; head {% ) 

 deejily concave, sparsely finely punctured, clothed with erect hairs; prothorax 

 much broader than long, rather quadrate in form, being as broadly rounded at 

 tip as at base, convex, very strongly declivous and broadly impressed near the 

 tip; asperate with transverse granulations, and clothed with long erect hair in 

 front, finely, not densely punctured behind; elytra with distant rows of rather 

 fine and not deeply impressed punctures, each with a testaceous vitta abbrevi- 

 ated before and behind. Long. 4-5 mm. 



One specimen from Canada given me by Dr. Horn. Resembles the 

 next, but is much larger, easily distinguished by the form of the thorax, 

 which is more abruptly declivous in front, and broadly retuse. 



2. X. bivittatus Mannh. Bull. Mosc. 1853, 23e.=Apate biv. Kirby, Fauna 

 Bor. Am. iv, 192, tab. 8, fig. 5 : ( '^ ) Bostrichus cavifrons Mannh. Bull. Mosc. 

 1843, 297; ibid, 1852, 359 -.—Xt/loterm eav. Mannh. ibid, 1852, 385. 



Maine to Alaska. In the male the head is concave, and the thorax 

 finely transversely asperate before the middle; in the female, the head 

 is convex, and the thorax much more roughly asperate. This species 

 varies greatly in color, the black elytral vittae sometimes occupy nearly 

 the whole surface, and sometimes are almost wanting. 



3. X. scabricollis. 



I have received from Mr. Ulke a remarkable male, having the head 

 deeply concave, as usual, but the thorax is as rough in front as in the 



* Ann. Soc. Ent. France, 1867, p. 634. 



