THE i:i:<>\\ n-taii. moth. 
135 
Fig. 21.— Full grown caterpillars of Brown-Tail 
Moth; enlarged l\ times. 
like a brush, and two thirds the height of the body. On 
the middle line 
of both the 
ninth and tenth 
segments is an 
orange or coral- 
red retractile 
tubercle. In 
about eight days 
the caterpillars 
shed their skins 
or molt, after 
which they are 
about two fifths 
of an inch long, 
the body hairs 
are relatively longer, though the tufts on the fourth and 
fifth segments are 
not so large. About 
the middle of May 
(15th to 20th), the 
second spring molt 
occurs. The cater- 
pillar is now about 
three fifths of an 
inch long, the yellow 
markings of the body 
being more apparent, 
and the brown tufts 
on the back less 
prominent. In this 
stage the upper hairs 
of the tubercles along 
the sides of the abdo- 
minal segments are a 
distinct white color, 
forming a band of 
white dashes along 
either side of the cat- 
erpillar, which is so 
Fig. 22.— Various forms of hairs from Brown- 
Tail Moth caterpillar. (After Fernald and 
Kirkland.) 
