LcContc. 



TOMICINT. 301 



1-5 X. plagiatus Lee., Tr. Am. Ent. Soc. 1868, 161. 



Maryland ; Mr. L'lkc ; this species is remarkable for the sexual differ- 

 ences. The declivity of the elytra is oblique, and the surface is without 

 tubercles, but the sutural stria is deeply impressed; in the tf there are two or 

 three small acute granules on the obtusely rounded margin of the declivity, 

 but in the 9 these are much more prominent, and the anterior one near 

 the suture is hooked. 



14. X. hamatus Lee., Tr. Am. Ent. Soc. 1874, 80. 



Mojave Desert, California. No sexual difference observed in ten speci- 

 mens examined. 



15. X. planicollis Zimm., Tr. Am. Ent. Soc. 1868, 145. 

 Maryland and District of Columbia; two specimens. 



DBYOOCETES Eichhoff. 



In this genus the prothorax is not or but slightly roughened in front ; it is 

 less prolonged over the head than usual ; the elytral declivity is oblique, 

 hardly flattened, not armed with tubercles ; tibiae strongly serrate. The 

 club of the antennas is obliquely truncate, with the sensitive surface divided 

 by transverse straight sutuies. 

 Larger, prothorax strongly punctured, not roughened 



in front 1. septentrionis. 



Smaller, prothorax strongly punctured, slightly 



roughened in front 2. aflfaber. 



Smaller, prothorax uniformly densely granulate, ely- 

 tra with deeper striae 3. granicollis. 



1. D. septentrionis. Bostrichus sept. Mann. Bull., Mosc., 1843, 298 ; 

 B. semicastaneus Mann., ibid. 1852, 358 ; Xylebori* xept. Lee., Tr. Am. 

 Ent. Soc. 1868, 161. 



Alaska, Canada, Virginia ; under pine bark. Length 4.4 mm. ; .17 inch. 



2. D. affaber. Bostrichus aff. Mann., Bull. Mosc. 1852, 359; Xyleborm 

 'iff. Lee., Tr. Am. Ent. Soc. 1868, 162. 



Alaska, British Columbia, Lake Superior. Length 2.7 mm.; .11 inch. 



3. D. granicollis. Xyleborus gran. Lee., Tr. Am. Ent. Soc. 1868, 162. 

 Pennsylvania and District of Columbia. Length 2 mm. ; .08 inch. 



OBYPHALUS Er. 



The species of this genus are of very small size, not very slender form, 

 and clothed with erect stout bristles ; the funicle is composed of four joints, 

 of which the first is larger and stouter, and the other three form a conical 

 mass, thicker outwardly. The club is compressed, rounded-oval, entirely 

 corneous and without sutures on the inner side, with straight or curved 

 sutures on the outer side, eyes large, not emarginate ; the prothorax has 

 but few large acute tubercles in front ; the elytra are punctured in rows, 

 and the declivity is convex, not impressed ; the tips are conjointly rounded. 

 The first and second ventral segments are very large, the others very short. 

 The tibise are only slightly dilated and scarcely perceptibly serrate. 



PROC. AMER. PHILOS. SOC. XV. 96. 2T 



