willow-moth

from The Century Dictionary.

• noun Any one of more than 60 species of American moths whose larvæ live on willows; notably the willow tussock-moth, Hemerocampa definita, the adult of the pink-striped willow span-worm, Deilinea variolaria, and either of the willow dagger-moths, Apatela oblinita and A. Americana.
• noun A common British noctuid moth, Caradrina quadripunctata, a pale mottled species whose caterpillar does much damage to stored grain.