INJURING THE LEAVES. 133 



There are several species of parasites that prey 

 upon the Cecropia caterpillars. On this account they 

 only occasionally become injurious. 



Remedies. — By spraying with the arsenites, or 

 hand-picking the larvae or cocoons, this insect may be 

 easily checked when it threatens to become destructive. 



The White-marked Tussock-moth. 



Orgyia leucostigma. 



This insect is one of the most destructive leaf-eat- 

 ing caterpillars, and during recent years has done 

 much damage in many cities and villages. The 

 larva feeds upon the foliage of a great variety oJ 

 fruit and shade trees. 



If the trunks or larger limbs of maple, apple, elm, 

 or am- other of the trees infested by this insect, -be 

 examined any time in autumn or winter, after the 

 leaves have fallen, one may find scattered here and 

 there upon the bark thin gray cocoons, many of 

 which will be covered with large bunches of spheri- 

 cal white eggs, fastened together by a protecting 





Fig. 65. Caterpillar of White-marked Tussock-moth. 



froth-like mass. In May, soon after the loaves come 

 out, these eggs hatch into small caterpillars, which 



