338 NEW YORK STATE MUSEUM 



KXEMIKS OF KVERGREEN OR CONIFEROUS TREES 



Borers in trunk and wood 



Large, brownish pitch masses on pine trunks 



Pitch mass borer, V a r h a r m o n i a p i n i , p. 341 



True bark borers 



Masses of pitch at the base of large pines, iisuallv indicate the presence of a stout, 

 brownish beetle about -' ,,; to '4 inch in length whic h, with its grub, bores the inner 

 bark Turpentine bark beetle, I ) e n d r o c t o n u s t e r e b r a n s, p. 342 



A rather stout, brownisli or black, cylindric beetle, aliout '4 inc h in length, makes more or 

 less longitu<linal burrows in the thicker bark of the trunk and larger limlis of various 

 ]iines Coarse writing bark beetle. To m i c u s <• a 1 1 i g r a p h u s, p. 345 



A light brown or nearh- Idack l)eetle about "' „ inch in length, bores the thicker pine bark 

 near the middle portion of the trunk and that of the larger limbs 



Pine bark beetle, '1' o ni i c u s ]) i n i , p. 351 



A brown or nearly black, ( ylinilric beetle about '/(. inch in length, works in the inner 

 layers of thicker pine bark, jiarticularly about the middle ]jart of the trunk and on 

 the underside of the limbs of larger trees T o m i c 11 s c a e 1 a t u s , p, 354 



A small, brown or blackish, cylindric beetle about 'a inch long, bores the thicker liark of 

 smaller pines and that of the limbs of larger trees 



Southern Tomicus, T o m i c u s c a c o g r a p h u s, p. 356 



A minute, dark bark beetle about '/it, inch long, makes short, sinuous mines in the bark of 

 spruce and pine Minute spruce bark beetle, C r y p t u r g u s atom u s. p. 359 



A rather stout, brownish or black beetle, about yfe inch long, malces longitudinal gal- 

 leries in the inner bark and outer sapwood of living spruce, 



S|iru<-e destroying beetle, D e n d r o c t o n u s p i c e a p e r d a, p. 379 



A light brown or black, rather stout beetle about ' ',, inch in length, makes somewhat irreg- 

 ular, transverse galleries in inner sjjruce bark, from which diverge smaller dilating 

 lar\'al galleries Spruce bark beetle, P o 1 y g r a p li u s r u f i p e n n i s, p. 386 



Balsam trees with red tips uiav be infested by a small, brownish or black beetle about 

 3/52 inch in length which, with its larvae, runs numerous galleries in the inner bark 

 and sapwood Pialsam bark borer, '1' o m i c u s 1) a 1 s a m e u s, p. 375 



A light l)r()un or blai k beetle about '/,6 inch long, makes pei'uliar, clubbed, longitudinal 

 galleries under the Ijark of red cedar 



Red cedar bark beetle, P h 1 o e o s i n us d e n ta t u s, p. 391 



