INSECT ENEMIES OF EASTERN FORESTS 409 
over 250 miles ranging in width from 25 to 30 miles, where intensive 
eradication work is centered in an attempt to prevent westward dis- 
persion of the pest. Burgess and Baker (70) published a history of 
the work against the gypsy moth. 
FIGURE 82.—The gypsy moth (Porthetria dispar) : A, Female moth; B, pupae; C, 
larvae, or caterpillars; D, male moth; H, egg masses. All about *4 natural size. 
The Federal Plant Quarantine Act of August 20, 1912, with re- 
visions, regulates the shipment of all evergreen products, nursery 
stock, forest products, and stone and quarry products originating 
within the infested areas. The inspection required by this act has 
aided materially in preventing the shipment of the pest to other parts 
of the United States. 
