Chapter XVII. 



INSECTS INJURIOUS TO THE FIR TREE. 

 Abies halsamea. 



AFFECTING THE TRUNK. 



1. The pine longicorn borer. 

 Monohammus confusor Kirby. 



Fully grown larvae, very large and long, and evidently ready to pu- 

 pate, occurred under the bark of a dead fir near the Glen House, White 

 Mountains, July 22. A fir tree was without doubt killed by these 

 borers at Merepoint, Brunswick, Me., as from the freshly cut stump a 

 fully grown dead larva and beetle were taken from the holes, several of 

 which were in the tree. The holes were round and 7""" in diameter. 

 Other trees were observed here and also on the Harpswell road with 

 large round holes in the bark, evidently the work of this borer. In 

 1882 I saw a fir at Phipsburg basin which had plainly been nearly 

 killed by this larva ; the tree was mostly dead, some of the branches 

 with red leaves ; a number of holes were in the trunk. We have also 

 called attention fp. 688) to the fact that living firs are often killed by a 

 borer answering to this species in the forests about the Rangeley Lakes. 



2. Xyloteres iivittatus (Kirby). 



This beetle occurred, though not commonly, under the bark of the 

 fir near the Glen House, July 22. 



3. Xylebores ccelatus Zimmermann. 



This beetle occurred in abundance in a fir stump, with the larvae, 

 August 27, at Brunswick. 



4. Crypturgus atomus Leconte. 



This minute species occurred frequently under the bark of a fir stump 

 at Brunswick late in August. 



5. The avhite pine weevil. 



Pissodes strobi Peck. 



This weevil, with the larva and pupa, was found under the bark of a 

 fir tree on the Mount Washington carriage road, near the Glen House, 

 July 22. 



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