12 
The young caterpillars drop down, hanging by silken threads, 
when the tree is jarred, and sometimes spin down without being dis- 
turbed, when they may be blown to a considerable distance by the 
II 
Fig. 8. White-marked Tussock-moih, Hemerocampa 
leucosfigma. larva. Natural size. 
wind.' When nearly full grown, they are great travelers, going 
from tree to tree and even moving in large numbers from a de- 
foliated tree to others near by. When full grown, the caterpillar 
Fig. 9. White-marked Tussock-moth. Ilcmernr ,mpa teucost.vimn,cocooi.'t, 
and egg masses oa tree trunii in a park m Cfiicago. 
