1906 



ENTOMOLOGICAL SOCIETY. 



59 



sects were fresh and perfect. TJbe discovery was a marvel to me till, on look- 

 ing to the river side, I saw, stranded, a crib of pine timber; and tEen the 

 mystery was solved. This incident shows how easily insects may be spread 

 over the country. 



There is a beetle called Monohamnius titiUator. (Fig. 23.) This beetle 

 and its congener, MonohaTninux sctitellafus (Fig. 24) make damaging tunnels 

 in the trunks of the pine ; and they sometimes turn up unexpectedly in places 

 far from their native forest. 



Fig. 

 gpeciosus, 

 borer. 



Plagionotus 

 Maple-tree 



Fig. 23. Monohamus titiUator, Pine- 

 borer beetle. 



The larva of Plagionotus speciosus (Fig. 25) is a borer in the maple. 

 That of the fine beetle Saperda calcarata bores in the poplar. The Apple-tree 

 borer, Saperda Candida (Fig 26) works also in the American mountain ash 

 and the thorn. The larvEe of Saperda vestita, Saperda tridentata and Cyllene 

 pictus bore respectively in the basswood, the elm and the cedar (Thuja occi- 

 dentnlis). 



Time would fail me to enumerate the small beetles which mine between 

 the bark and the white wood, and which at times do much harm — volumes 

 might be written upon them. 



6 C 



' Fig. 26. Saperda Candida, Apple-tree borer : a grub, 

 h pupa, c beetle. 



But I must not pass over the more important of the Lepidopterous and 

 Hymenopterous borers. Of the former we have remarkable instances; in 

 Cossus Centerensis, which bores in the poplar (Fig. 27) ; in Prionoxystus rob- 

 mice, which, as its name implies^ bores in the locust, or false acacia; and in 

 Prionoxystus Macmurtrei, which Mr. A. F. Winn has found upon oaks on 

 Mount Royal. 



