192 SPAN-WORMS. 
a very stout body and wings, so that it looks more like a 
bombycid moth. Both fore and hind-wings are gray, dotted 
and streaked with black, and with a wavy light band cross- 
Fig. 192.—Amphidasia betularia. After Taschenberg. 
ing the wings beyond the middle. The under surface is paler 
than the upper; the body is gray, dotted with black. The 
moth expands two inches or more. It is shown in Fig. 191- 
