Saturniidae 
This common insect, which ranges from Canada to 
Florida, and westward and southward to Texas and 
Mexico, subsists in the larval stage upon a large variety of 
Fig. 43.—Larva of Automeris io. 
(After Riley.) 
trees and shrubs; in fact, the 
caterpillar is almost omnivo¬ 
rous. The larva is a beautiful 
object, the body being green, 
ornamented with a lateral 
stripe of pink and creamy 
white and covered with 
clusters of branching spines. 
These are possessed of sting¬ 
ing properties, and the cater¬ 
pillar should be handled with 
extreme care, if painful con¬ 
sequences are to be avoided. 
In spite of this defense the 
larvae are greatly liable to 
the attack of ichneumon 
wasps, which destroy multi¬ 
tudes of them. 
Genus HYLESIA Hubner 
This is a neotropical genus of small size, one species of 
which, common enough in Mexico, is occasionally found in 
Arizona. It is a true Saturnian, the secondaries having but one 
inner vein and the discal cells in both wings being closed. 
(1) Hylesia alinda Druce, Plate VIII, Fig. 12, $. (The 
Alinda Moth.) 
The specimens I have were taken on the Mexican border of 
Arizona. So far as I remember, nothing has been written upon 
the life-history of the species. 
SUBFAMILY HEMILEUCIN/E. 
The moths of this subfamily may be structurally differentiated 
from their near allies by the fact that the hind wings have two 
distinct internal veins, 1 a and 1 b. The antennae of the male 
insect in the genus Coloradia are doubly bipectinated. In the 
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