1912 



ENTOMOLOGICAL SOCIETY. 



59 



the female ovipositing in the spring always selects one of the terminal shoots of the 

 previous season's growth, generally the leading one. The new shoots grow to a 

 certain extent, varying according to the number of larvae present. I have some- 

 times found shoots apparently containing only one or two individuals, whose sub- 

 sequent growth had not been noticeably retarded, but as a rule they droop and die 

 long before they have attained their full length. 



I have never seen a red pine affected by this insect, but this summer I found 

 a young white spruce, whose terminal shoot had been killed, apparently by this 

 weevil. It was growing among the pines of the same grove in which the weevil 

 was so common. 



Another insect that was more abundant than usual in white pines in the sea- 

 son of 1911 is the Pine-bark Aphid (Chermes pinicorticis. Fitch). In 1910 I noticed 

 a single tree about eight inches in diameter, the bark of whose trunk was almost 

 covered on one side by the white flocculent material secreted by this aphid. One 

 other tree near by was also affected, though to a much less degree, but no others 

 were seen on which this insect was present' to any noticeable extent. This year the 



Pig. 26. — Monohammus confusor — Male. 



Chermes was found on quite a number of trees on the ridge, but it is still rather 

 local. It seems to prefer the smooth bark of the trunk but also occurs on the 

 branches and may attack saplings two or three feet high, as well as larger trees. 

 One side, apparently the most sheltered, is generally more thickly covered than 

 the rest. 



When I first saw the diseased trees about the end of July the aphids had 

 already disappeared, but as the flocculent material is left upon the bark their for- 

 mer presence is readily detected. No apparent effects in the vigour of these trees 

 could be detected, and in fact the white pine is on the whole a very healthy tree 

 at De Grassi Point. A number of young trees were affected by a twig blight in 

 1910, but this did not reappear to any extent in 1911, and the unusual number of 

 spittle insects in the former season also failed to assert themselves during the sum- 

 mer of 1911. 



As a result of the windstorm, however, a number of fine white pine were up- 

 rooted or had their tops or even the upper half snapped off. When I first went 

 to the Point, near the end of July, these fallen trees already harboured hosts of 

 bark beetles and Monohammus larvae. The bark beetles were chiefly Ips pirn. Say, and 

 Pityogenes sp., a very common, though as yet undescribed, species. The former was 



