INSECTS AFFF.CTING PARK AND WOODLAND TREES 257 



Small, brown or lil.uk hectU's about ' '^ iiu h in length, making longitudinal burrows 

 troui which small, legless grubs excavate galleries at nearly right angles. The 

 beetles also work in the leaf i)etioles and on the young twigs, causing the wilting of 

 the foliage in midsummer 



Hickory bark borer, S c o 1 y t u s ([ u a d r i s p i n f) s ii s, i). 275 

 Logs of black ash ami dying trees are frequently seriously injured by borers making 

 numerous holes in the wood, also attacks elm and hickory 



Banded ash borer, N e o c 1 y t u s c a p r a e a, ]>. 279 

 A white, tlat headed griih makes \ery tortuous, interlacing burrows under chestnut and 



oak bark Two-lined chestnut borer, A g r i 1 u s b i 1 i n e a t u s, p. 280 



Oval swellings with 4 to 5 longitudinal scars occurring on the small limbs and stems of 



wild thorn Thorn limb borer, S a p e r d a fayi, p. 283 



A flattened, whitish, rather delicate grub about 34 inch in length, with a large, flattened 

 head, may be found boring the inner bark of white and other birches 



Bronze birch borer, A g r i 1 u s a n x i u s, p. 284 

 Small, pinholelike perforations in elm, ])articularly the diseased bark, may be the work of 

 a minute cylindric, dark brown lieetle about '/,o inch long 



Dark elm borer, H y 1 e s i n u s o p a c u 1 u s, p. 288 

 A small, brownish, rather stout, cylindric beetle bores commonly in freshly cut ash 



Ash timber beetle, H y 1 e s i n u s a c u 1 e a t u s, p. 288 

 A minute, reddish brown, cylindric beetle about ' 3^ inch in length, sinks small, cylindric 

 galleries in dead beech, spruce and other trees 



Apple wood stainer, M o n a r t h r u m m a 1 i, p. 289 

 A light brown, nearly black, cylindric beetle about j4 inch long, frequently enters the 



exposed wood of beech, oak and other trees X y 1 o t e r u s p o 1 i t u s, p. 292 



Similar species of about the same general appearance, boring in white, paper and yellow 



birch and poi)lar Xy lo t eru s (several species), p. 293 



A minute, slender, dark brown beetle about \^U in'-h long, sometimes riddles the dead 

 inner bark of red oak 



Minute oak bark lieetle, P i t y o p h t h o r u s m i n u t i s s 1 m u s, ]>. 295 

 Similar species working in dead black birch P i t y o p h t h o r u s sp.. p. 296 



Species usiiallv working in seasoned 7vood 

 Fine, white, dustlike borings and numerous minute holes in well dried hard woods 



Powder post beetle, L y c t u s u n i p u n c t a t us, p. 296 

 Dried birch and maple wood is sometimes infested by a small, dark brown beetle about 3/,6 

 inch long, with bright, rufous antennae 



Small red horned borer, P t i 1 i n u s r u f i c o r n i s, p. 298 



