THE PINE INVESTIGATION. 341 



the trees so infested, as well as many of the trees that were not 

 injured, were being attacked by the turpentine bark beetle, 

 and some of tjiem that had been seriously injured by the de- 

 structive species last fall, were being attacked by two species 

 of bark beetles 1 that were exceedingly common in the bark of 

 saw logs and felled trees. Both of these bark beetles had been 

 mentioned by Fitch, Packard and other writers, as among the 

 worst enemies of the white pine in the north and the yellow 

 pine in the south. It was therefore thought -that those surviv- 

 ing species might attack and kill the trees that were then 

 healthy. In fact, Tomicus pini was found mining in the green 

 bark of living trees and depositing eggs. No trees in this 

 grove or near it had died, but the iudications were that they 

 would all die. Proceeding farther into the white pine 

 forest, accompanied by Mr. Beaty and Mr. J. B. 

 Power, we found numerous* small groups of dead and dy- 

 ing trees, but no large areas upon which the timber had been 

 killed. Upon felling and examining some of the trees that 

 had died the previous fall and others that were then dying, I 

 found upon removing the bark, that in every case all stages 

 of the destructive bark beetle were dead, and where there were 

 a great many larvae in the bark, the odor from their decaying 

 bodies was very perceptible. It was also found that some of 

 the large turpentine bark beetles, ( both adults and larvae,) were 

 dead, especially where they occurred in the bark some three 

 or four feet above the base of the tree. The other two bark 

 beetles, (Tomicus pini and Tomicus caelatus,) while occurring 

 in great numbers in the dead and dying trees and in the logs 

 and tops of felled ones, none were dead, nor did they appear 

 to have been affected in the least by the mysterious causes 

 which had resulted in the death of so many of the other two 

 species, especially of the destructive bark beetle which it 

 seemed was completely exterminated. 



ALL EXAMPLES OF THE DESTRUCTIVE BARK BEETLE DEAD. 



Here was an exceedingly interesting condition, presenting at 



1. Tomicus pini and T. caelatus. 



