INJURIOUS INSECTS. 253 



t7. speciosus. — (The beautiful clytus.) Head yellow j thorax 

 black, with two yellow transverse spots on each side, or rather 

 "parts of bands ; wing covers § black, the rest yellow ; the black 

 curiously banded with yellow, in the form of W, and the inner 

 parts of the same letter ; besides these, a yellow spot on each 

 shoulder, and complete yellow band convex downwards ; the yel- 

 low part banded black, convex upwards, with two dots, one on 

 each sitle. 



Observations. This is the largest known species of the genus cly- 

 tus. Its larva destroys the sugar maple, by perforating its trunk. 

 The eggs are laid upon the trunk of the maples in July and August j 

 the grubs, as soon as hatched, penetrate the bark j the next year, 

 they penetrate deeply into the wood, forming many sinuous pas- 

 sages. 



In order to destroy the grub, Harris says they must be sought 

 for in the spring, when they may be detected by the saw-dust from 

 their borings, before they have penetrated deeply into the wood, 

 when they may be destroyed by thrusting a wire into their holes j 

 or by the judicious use of the knife. When young maples are 

 seen to languish and loose their thrift, let them be examined for 

 this insect. 



C. pictus. — Body, black, ornamented with transverse yellow 

 bands, three on the head, four on the thorax, and six on the wing 

 covers ; tips also edged with yellow ; the third band is a W ; the 

 others may be described as zig-zag — or all looking more or less 

 like a W ; legs, rusty red. 



Observations. In September they gather upon the locust-trees, 

 when they pair ; after which, the female deposits her snow-white 

 eggs in crevices in the bark. The eggs are soon hatched, and the 

 grubs immediately burrow into the bark, (he inner side of which 

 they soon devour; there they remain torpid during the winter ; 

 when the spring opens, they penetrate the wood, in irregular 

 winding passages. Their works may be known by the saw-dust 

 cast from their holes, and the oozing of sap. The effect of the 

 wounds caused by these grubs, is to produce swellings in the trunk 

 and limbs, and s\ich a weakness of the woody texture, that it is un- 

 able to maintain a resistance to the winds. The grubs attain their 

 full size by the 20th of July, when they soon become pupse, 



