AMERICAN COLEOPTERA. 159 



9 ofX. biviffatus, and covered behind with anastomosing curved lines, 

 leaving between them flattened granules ; the elytra are shining, and 

 the punctures of the rows are larger and more strongly impressed; the 

 color is uniform reddish brown, with the antenna3 and feet paler. 

 Long. 3-5 mm. Washington, D. C. 



4. X. politus Lee. Entom. Writings of Thos. Say, ii, Zl9.^Bostrichus politus 

 Say, Journ. Acad. Nat, Sc. Phila. v. 256; ed. Lee. ii, 318. 



Middle and Southern States. Narrower than the other species, 

 more hairy, and easily known by the punctures of the elytral rows 

 being larger and more distant; the club of the antennae is broader 

 and less oval. 1 have seen no specimens with concave head. 



XYLEBORUS Eichhoff. 



These species have the eyes slightly emarginate; the outer (or pos- 

 terior) face of the antennal club is corneous and shining, the inner 

 face equally so, except at the end, where there is an oval pubescent cir- 

 cularly annulated space; the outline viewed from the outer face ap- 

 pears truncate, and sometimes almost obtusely pointed at the side. 



In all the species known to me, the first joint of the funiculus of the 

 antennae is longer and thicker, equal in length to the others united, 

 which, varying in number from three to four, are closely joined, form- 

 ing a conical mass, the separations of which are visible only with a 

 very high magnifying power. They may be grouped as follows : 



A. — Body stout cylindrical, thorax not longer than wide, funiculus 

 of antennae 4-jointed. 



1. X. tachygraphus.=Xy/e6orMS iachygr. Zimm. (Ante, p. 144.) 



2. X. T^yxi.=Scolytus pyri Harris. (Ante, p. 144.) 



'6. X. obesus. — Short and stout, cylindrical, blackish-brown, thinly clothed 

 with long soft erect pale hairs, antennae reddish-brown : head convex, coarsely 

 but not densely punctured; prothorax rather broader than long, strongly 

 roughened with subacute tubercles in front, nearly smooth behind ; elytra with 

 rows of large punctures, not very closely set, intervals flat marked with small 

 distant punctures from which proceed the long hairs; tip obliquely declivous, 

 not tuberculate, but with the striae somewhat impressed, and the side and tip 

 acutely margined, as in the two preceding species. Long. 3 mm. 



Virginia, Massachusetts and Canada. Differs from the two pre- 

 ceding by its much stouter form and by the absence of the small acute 

 tubercles of the declivous tip of the elytra. 



B. — Body usually slender cylindrical, posterior declivity of elytra 

 obliquely and strongly flattened, with rows of tubercles or teeth; funi- 

 culus of antennae 5-jointed — Xyleborus Eichhoff. 



a. — TibifB finely serrate. 

 4. X. celsus Eichh. Berl. Ent. Zeitschr. 1867, 400. (Ante, p. 145.) 



