510 ECONOMIC ZOOLOGY AND ENTOMOLOGY 



suffer from their attacks. The insects pass the winter as small 

 larvae that hibernate in a nest made of leaves and tips of twigs 

 fastened together with silken webs. Some of the hairs of the 

 full-grown larvae cause severe irritation when they touch the 

 human skin. This is regarded by many as the most serious 

 phase of an outbreak of this pest. As yet the insect occurs 



FIG. 242. Tent of tent-caterpillar on a live-oak tree. (Reduced.) 



only in some of the New England states, but it is constantly 

 being introduced into other states on nursery stock, and unless 

 great care is taken it may soon become established elsewhere. 

 The winter nests containing the young larvae are conspicuous 

 on the leafless trees, and should be pruned off and burned. Ar- 

 senate of lead, 4 pounds to 50 gallons of water, will kill most of 



