THE FLORAL WORLD AND GARDEN GUIDE. 



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size of tbe perfect insect, very minute, and is a soft smootli grub totally 

 devoid of legs, but it is furnished with considerable muscular power, 

 and with powerful mandibles, with which it at the same time takes 

 its food and perforates its minute tunnel." The trees that are badly 

 attacked with this insect, soon show unmistakable signs of a rapid 

 decay, they lose the power to produce new leaves, and their existence 

 when in this weakly state is brief indeed. For this pest there is no 



4 5 



* 



FiQ. 1.— A, The tunnel of the Cossoiuis linearis, b, C. linearia. 1, Larva of Seoly- 

 tus destructor (magnified). 2, Larva of Scoljtus destructor. 3, Head of S. 

 destructor (magnified). 4, S. destructor (magnified). 5, Size of S. destructor. 



known remedy, and none of the authorities have suggested any means 

 by which the devastations of the larvfe may be checked. 



The Scolytus is a small beetle, somewhat similar in character to 

 the Cossonus, as will be seen on reference to the representations of 



ViG. 2. — Tracks of Scolytus on the wood of the elm. 



the two' insects in Fig. 1. It has the power of penetrating the hard 

 outer bark of the trees, and depositing its eggs underneath ; Fig, 2 

 represents a piece of wood which lias been infested with a colony of 

 the Scolytus. The female insect has perforated the bark at A, and 

 it has then proceeded to form a tunnel underneath the bark. At b, 

 and c, are rather deep cavities, and these are supposed by some en- 



Angiut, 



