SPAN-WORMS. 195 
These span-worms, which hatch early in spring, are not 
unlike the true canker-worms, but are much larger and 
marked differently. The caterpillar has a dull red head, 
with a “V’’-shaped mark on the front; the body is yellow 
above, with many longitudinal black lines; the under side is 
paler. When full grown these worms measure about an 
inch and a quarter in length. The different states of this 
moth are shown in Fig. 193. 
THE WINGLESS PHIGALIA. 
(Phigalia strigataria Minot). 
This moth is also fairly common in Minnesota, the males 
flying about early in April. They are pale-ash, with dark 
brown specks and lines, which form three blackish trans- 
verse lines across the fore-wings, witha subterminal whitish 
line. The hind-wings are whitish, finely dusted with dark 
scales, which in well marked specimens are arranged in such 
a way as to form a continuation of the transverse lines of 
the fore-wings. The antenne are strongly pectinated. The 
wings have an expanse of about an inch and a half. The 
Fig. 194.—Phigalia strigataria Minot. 
female is wingless, of a light gray color with a slight olive 
tint; her body is mottled all over with black, the spots 
above being large those below fine. The thorax is nearly 
uniform black; the short head, scarcely seen from above, is 
grayish black; the clypeus and antennz are black, the 
latter annulated with the ground color of the body. The 
divisions between the extended segments of the abdomen are 
