month, the insect issues from the chrysalis, 

 deposits its eggs as before mentioned, and prepares 

 to hybernate, like others of the same tribe, in the 

 roofs of houses, beneath the bark of old trees, 

 &c. The larvae appear in April, assume the 

 nymph state, and accomplish their final trans- 

 formation in the course of July. Thus, there are 

 two periods in each year assigned for their pro- 

 duction and reproduction: nevertheless, indivi- 

 duals may be seen during the whole season, in 

 almost every stage of existence." Having thus 

 ascertained an important part of the natural 

 history of the species, and the inefficiency of the 

 applications hitherto made with a view to prevent 

 its depredations, Mr. Thomas was led to make 

 another experiment, which, he informs us, has 

 been completely successful. " Remove the earth 

 from about the trunk of the tree quite down to 

 the lateral roots, press with the but end of the 

 pruning knife against the bark in different places ; 

 if it appears to adhere firmly, and no gum or 

 moisture issues, a thin coat of the composition 

 described below, may be applied both above and 

 beneath the surface, by a brush or wooden spatula, 

 about two inches broad. Then take Canton 

 matting, (or any other similar substance,) cut 

 into pieces of from six to tw^elve inches in width, 



PliATK XIX. 



