INSECTS AFFECTING PARK AND WOODLAND TREES 339 



Large bark and wood borers, sawyers and their associates 



Large, white, fleshy, legless grubs from about % to 1% inches long, may be frequently 

 found working in the inner bark and sapwood of dead and dying pines, spruces, 

 balsams and also in cut logs from these trees, produce the following : 

 A magnificent grayish beetle finely mottled with light brown and ranging in length 



from to 1 Yi inches Sawyer, Mono h a m m u s c o n f u s o r, p. 360 



A uniformly black beetle mottled with white and with a white scutellum, about )/% 

 inch in length . . White spotted sawyer, M on h am m u s scutellatus, p. 364 

 A brownish, mottled, cylindric beetle about ^ inch in length and with very long, 



slender antennae Tickler, Monohammus t i t i 1 1 a t o r, p. 365 



A large beetle about ]/% inch long, with light grayish wing covers mottled with brown 



and dark spots Marbled sawyer, M n o h a m m us marraorat u s, p. 366 



Smaller white grubs working in decaying bark, never entering the wood. 



A white, broad headed, flattened grub occurs in considerable numbers on the bark of 

 dead pines, transforming to a gray, black marked beetle with conspicuous ridges 



on its wing covers Ribbed pine borer, R h a g i u m 1 i n e a t u m, p. 366 



A smaller, less flattened grub producing a small beetle with a black head and thin, 



dark bluish wing covers P y t h o a m e r i c a n u s, p. 368 



Flattened, white or yellowish spotted beetles about inch in length, occur on spruce and 

 hemlock in July, and are the parents of a destructive flat headed borer 



Spotted buprestid, Mela nop hila f u 1 v o g 'u 1 1 a t a, p. 390 



Smaller wood borers 



A rather stout, brownish black beetle about J /& inch long, attacks exposed wood of various 



coniferous treees Spruce timber beetle, X y 1 o t e r u s b i v i 1 1 a t u s, p. 369 



A brownish black, rather slender beetle about }i inch long, enters the sapwood of dying 

 and dead white pine, making cylindric galleries, with black stained walls. 



Eastern pine wood stainer, Gnathotric h u s m a t e r i a r i u s, p. 37 1 

 Small bark and wood borers working in the inner bark and outer sapwood and forming 

 rather irregular galleries in dead limbs 



Pityophthorus and Pityogenes (several species of each), p. 372-375 



Twig borers 



An oblong, oval weevil about % inch long, frequently deposits eggs in the leading shoots 

 of pine or other evergreen trees. The grubs work in the shoots and kill them, causing 

 an irregular, deformed tree of little commercial value 



White pine weevil, Pissodes strobi, p. 397 



