446 



NEW YORK STATE MUSEUM 



injury. It has been recorded from a number of Northern States, and has 

 been taken on linden, beech, hickory and chestnut. 



Hickory timber beetle 



Xyleborus cc/sus Eich. 

 A cylindric, brownish beetle about Vj6 inch long, makes holes of nearly uniform 

 diameter in hickory and oak. 



This species was bred in considerable numbers out of hickory logs 

 from trees killed by the hickory bark borer, Scolytus quadrispi- 



n o s u s Say, at Geneseo N. Y. 



Description. The beetle is about 



3/i6 inch long, rather slender, almost 

 cylindric in shape, with the tips of 

 the protruding mouth parts slightly 

 darker. The prothorax and elytra 

 are rather sparsely clothed with slen- 

 der, yellowish hairs, and there are 

 two prominent and a number of less 

 distinct tubercles on the somewhat 

 steep declivity. This species, accord- 

 ing to Dr LeConte, differs from 

 X. d i s p a r Linn, by its much 

 more elon- 

 gate form, 

 the thorax 



being about one half longer than wide, with the fv\ // 



sides parallel behind the middle and the elytra much \\\// 



more than one half longer than the thorax. The 



antenna is illustrated on plate 67, figure 14 and a " 



^ ' o Fig. 103 Middle tibiae: a— Xyleborus 



portion of the proventriculus on plate 69, figure 8. ceUus: *_x. dispar- r-chra- 



J^ ^ ^ ^<_> mesushicoriae, much enlarged 



Life history. This is our largest American (original) 

 species of the genus, and according to Mr Hubbard, has been found 

 only in hickory, though Drs Packard and LeConte record it as an 



le and male of Xyleborus i 

 Hubbard, U. S. Div. Eiit. Bui. 7, n. 



