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 celsus Eich. 



A cylindric, brownish beetle about V16 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/ X 6 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 



Fig. 102 Female and male of Xyleborus celsus (After 

 Hubbard, U. S. Div. Ent. Bui. 7, a. s. '97) 



more elon- 

 gate form, 

 the thorax 



being about one half longer than wide, with the 

 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 

 portion of the proventriculus on plate 69, figure 8. 



Life history. This is our largest American 

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

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



is*. 103 Middle tibiae : a = X yleborus 

 celsus; £=X. d i s p a r ; c—C h ra- 

 in esus hicoriae, much enlarged 

 (original) 



