IXSECTS AFFECTING PARK AND WOODLAND TREES 



371 



Eastern pine wood stainer 



Gnatliotrichus niaicriarius I'itch 



A brownish black, ralluT sloiuU'r beetle abciut ^ a im li lon,t,', enters the sapwood of 

 dyint; and dead white jiine, making cylindric galleries, the walls of which are stained black. 



This coininon wood-boriiig Ambrosia beetle li\es on a fiinoiis cultivated 

 in its oalleries. This species is common in (l\ino- and deail white pines in 

 different sections of the State, enterino; the wood very shortly after the tree 

 has been injured as a rule. It was met with on spruce at Big Moose 

 N. Y., Jtily 2, 1903, it being attracted to trees injured by recent fires in that 



rius. (Afler Hub- 

 bard, U. S. Dep't 

 Agric.Div.Ent. Bui. 

 7, n. s. 1897) *> ' 



of Gnathotiichus materia 

 U. S. Dep t Agric. DIv. En 



us in pine (.\fter Hubbard and Hopkii 

 Bui. 7, n. s. 1897) 



section. It has also been noticed by Dr Fitch. This insect makes slender, 

 cylindric burrows across the wood fibers and usually parallel with the lines 

 of growth. Short, straight, lateral galleries or brood cells branch off from 

 the main ones at right angles above and below. This species is attracted 

 by the odor of turpentine, and Dr Hopkins records it as one of a number 

 collected on a recently painted greenhouse. He states that this species, 

 associated w^ith others, is frequently found in the sapwood of spruce at 

 Williams River \V. \'a., and adds that it is ver\' common in that state in 

 the sapwood of dead and dying pine and spruce trees, logs and stumps. He 



