440) MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
general the life cycles and work of the various species are similar, so, 
in the following paragraphs, two of the better-known native species 
are briefly mentioned, and an introduced species is discussed in some 
detail. 
The full-grown larva of the hag moth (Phobetron pitheciwm (A. 
& §.)) bears nine pairs of lateral brown processes, of which the 
third, fifth, and seventh are longest and are curved and twisted, sug- 
FIGURE 93.—Larvae of the saddleback caterpillar (Sibine stimulea). 
(Courtesy Conn. Agr. Expt. Sta.) 
gesting the disheveled locks of a hag. These appendages are clothed 
with stinging hairs. The saddleback caterpillar (Sibine stimulea 
(Clem.)) has a characteristic green patch on the back resembling 
a saddlecloth, and the saddle is represented by an oval purplish-brown 
spot. The body of the larva, evenly rounded, is armed along the sides 
with fascicles of spines, and has two large tubercles at the anterior 
and posterior ends armed with spines (fig. 93). A nettling effect is 
caused when the spines come in contact with the human skin. The 
larvae of these native species are rarely abundant enough to cause 
