518 COLEOPTEUA OF NORTH AMERICA. 



toothed. The eyes are completely divided, and the club of the 

 antcniue is oval, solid, pubescent on both sides, and not annulated. 

 The tibite are broad, rounded at tip, and serrate on the outer and 

 terminal edge. The tarsi are slender, the fourth joint small, as 

 usual, and the fifth long, with simple divergent claws. The 

 species bore deeply into the wood of the trees they attack, thus 

 injuring the timber much more than the subcortical Tomici. 



Four spepies of Xyloterus occur in the Atlantic region, one of 

 which "extends to Alaska and Vancouver Island. 



Group III. — Xylebori. 



The essential character of this group is that the club of the 

 anteunge is entirely corneous, and not articulated on the inner 

 surface ; on the outer surface it is also corneous, except towards 

 the distal end, where it is obliquely truncate; the truncate surface 

 is pubescent and sensitive, and has three concentric or transverse 

 sutures, which indicate the other joints of the club. Tiie scape 

 of the antennae is elongate, and the funicle usually distinctly 

 5-jointed, though in some species there appear to be but four 

 joints. The tibite are dilated, more or less serrate, and spinose 

 on the outer margin, with the apex obtusely rounded, and the 

 inner angle not very strongly unguiculate. The tarsi are slender; 

 fourth joint small, fifth nearly as long as the others united; claws 

 strong, divergent, simple. 



Funicle 5-jointed ; antennal club witli sensitive surface oblique, marked 



with annulated curved sutures. 2. 



Funicle 5-jointed ; sutures of tlub not concentric. 3. 



Funicle 4-jointed. Cryphalus. 



2. Tibiae straight, outer edge spinose. Coccotrypes. 

 Tibiae with outer edge curved, finely serrate. Xyleborus. 



3. Tibia) and antennae as in Xyleborus ; antennal club obliquely truncate, 



with straight sutures. Dryocoetes. 



Tibiae slender, outer edge spinulose ; antennal elub not tiiincate, witli 

 sutures curved backwards forming loops, almost as in Micracis. 



Xylocleptes. 



Coccotrypes has been introduced in date seeds. The other 

 genera extend across the northern part of the continent. 



Grouj) IV. — Tomici. 



The species of this grouj) are of cylindrical, but not very slender 

 form, and are easily recognized by the deeply excavated elytral 



