280 PESTS OF ORCHARD AND SMALL FRUITS 
but later the entire leaf is destroyed, except the main veins. The 
worms are three fourths to one inch long, naked, dark green, and some- 
Fic. 404.— The Spring Canker-worm. Original. 
times rather dis 
tinctly striped. 
They have a pair 
of prolegs or clasp- 
ers on the hind 
end, a single pair 
a short distance 
forward of these, 
but no other legs 
from that point to 
the three pairs of 
true legs near the 
front end of the 
body. Thus, in 
moving, they arch the body so as to bring the hind end up near the 
front. This species may be distin- 
guished from the similar fall canker- 
worm by the fact that the latter has 
an additional pair of rather small pro- 
legs near the hind end. 
Fic. 405. — Adult female of the Spring Can- 
ker-worm. Enlarged and natural size. Fic. 406.— Work of Canker- 
Original. 
worms. Original. 
