378 MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
tubercles on the prothorax and a double row on the sides of all other 
segments are blue. The tubercles are armed with short, black spines, 
the spiracles are white with a narrow black ring, and the thoracic 
feet are yellowish green, but black at the end (fig. 72,4). This species 
lon 3 
FicurRE 72.—Larvae of some Saturniidae: A, Philosamia cynthia (the cynthia 
moth) ; B, Samia cecropia (the cecropia moth) ; C, Callosamia promethea (the 
promethea moth) ; D, ee luna (the luna moth) ; E, Telea poly phemus (the 
polyphemus moth) ; F, Automeris io (the io moth) ; G, Hemileuca maia (the 
buck moth). 
is distributed throughout the eastern part of the United States and 
eastern Canada, It has a long list of food plants including apple, 
ash, birch, cherry, elderberry, grape, hawthorn, maple, rose, sassafras, 
and willow. The moths emerge from May to July, larvae are found 
from June to October and they ‘transform to pupae within dense, silken 
cocoons. The cocoons are spun on a branch of the food plant or 
