LASIOCAMPIDS. 141 
are also very injurious to plum, cherry, apple and other 
fruits. The moth (Fig. 140, Plate XVII), which expands an 
inch and a half or more, is brownish-yellow. It has on the 
forewings two oblique brown lines enclosing a darker 
space. The eggs are about one twenty-fifth of an inch long 
and one-fortieth wide; they are arranged three or four hun- 
dred in number in the form ofa ring around the twigs of 
trees. These clusters differ from those of the other tent- 
caterpillars in being uniform in diameter and cut off square- 
ly at the ends. The individual eggs are white; they are 
covered with a brown varnish-like substance. The egos 
hatch also early in spring, and the young caterjillars have 
sometimes to wait for some time before the trees furnish 
any food, but as they are very hardy they have beenknown 
to live in cold weather for three weeks without eating. The 
writer kept them under meiting ice for four days without 
injuring them in the least; in fact, as soon as thawed out 
they seemed to show increased appetite. But as the buds 
expand and the young leaves appear the worms make up for 
lost time. Like the other tent-caterpillars they spin a silken 
thread wherever they go; they are also gregarious as long 
as young, but scatter when older. They march in regu- 
lar order, feed twice a day and when not thus engaged they 
crowd together, most frequently upon the trunk of a tree 
(Fig. 141, Plate XIX). In such positions they also undergo 
their moults, and not infrequently large numbers of their 
empty skins are found together, held in position and to the 
tree by numerous threads (Fig. 142, Plate XIX). The 
caterpillars, when fully grown, are a little smaller than 
their relatives upon orchard trees. Their general color is 
pale-blue, tinged with green on their sides, and every- 
where sprinkled with black dots or points, while along the 
middle of the back is a row of white spots, on each side of 
which is an orange-yellow stripe, below which is another 
cream-colored one. All these stripes are edged with black. 
Each segment of the caterpillar has two elevated black 
