AMERICAN COLEOPTERA. 147 



lina in 1847 — 49, and with B. sfenojraphus and tjjpographns in Ger- 

 many frequently since 1665. 



B. [avulsus Eichh. Berl. Ent. Zeitschr. 1807, 402.]— Long. U Hn. Of the same 

 form color and sculpture as B.pini, but much smaller, and easily distinguished 

 by the posterior excavation of the elytra, the side margin of which is armed 

 with but a few (three) small teeth; it is also less hairy, and the hinder part of 

 the suture appears altogether without hair. — Carolina. 



B. pini Say, Journ. Ac. iN'at. 8c. Phila. v, 257. — Long. IJ — 1| lin. Brown or 

 ferruginous; antennae yellow; form as in S. exes us, but much smaller, and 

 comparatively longer and narrower; the rows of punctures of the elytra are 

 finer, and the punctures not transverse, with the exception of those of the first 

 stria; the first five intervals are entirely smooth in front; the posterior exca- 

 vation acutely margined with five lateral teeth, of which the uppermost is the 

 smallest, and the middle one the largest, the suture is somewhat elevated and 

 distinctly hairy. — North America. [This species is not that described by Say, 

 but an allied one, which I have named cacographus. — Lec] 



B. exesus Say, Journ. Ac. Nat. Sc. v, 255. — Long. 2 — 2V lin. Blackisli, brown, 

 or ferruginous, antennse yellow; upper surface at the sides thickly punctured 

 and fringed with long yellow hair; head and prothorax roughly tuberculate, 

 the latter finely punctured and shining behind; elytra punctate-striate, the 

 punctures large and transverse: the upper intervals also marked with a few 

 punctures ; posterior excavation deejj, strongly margined, and armed with six 

 teeth, of which the 2nd and 3rd are the largest; the narrow part of the mar- 

 gin between the 6th tooth, and the suture has the appearance of a 7th tooth. — 

 North America. This species is very similar to the European B. stenographus 

 Creutzer {=typographus Fabr.), but differs by the much more finely punctured 

 hind part of the prothorax and by the posterior excavation of the elytra, which 

 is more rngosely jjunctured, and hairy. 



Tribe III. — Hylurgt. 



The third joint of the tarsi is more or less dilated and bilobed, in 

 which respect the insects of this tribe differ from those of the preced- 

 ing ; the cylindrical convex abdomen separates them from Eccoptnja- 

 steres. * 



The genera may be separated as follows : 

 * Basal margin of the elytra acutely elevated and serrate; 



1. Club of antennae composed of lamellae Phloeotribus Latr. 



2. Club of antennse composed of closely united joints, knob shaped ; the sub- 

 genera are as follows: 



a. Club of antennse elongate oval, or spindle shaped, pointed at tiji. 



Hylesinus Fabr. 



b. Club of antennse short and obtuse, sometimes thick and almost glo- 

 bose, sometimes compressed, and concave Dendroctouus Erich. 



** Basal margin of elytra not acutely elevated : 



3. Club of antennse short and thick, knob shaped, composed of closely uni- 

 ted joints Hylurgus Latr. 



■s- None of the 2nd tribe are described in the memoir of Dr. Zinunermann ; the 

 species of ray collection will be made known in the appendix. — Lec] 



