ermine moth

Webster's Dictionary (1913)

Zoology, a white moth with black spots (esp. Yponomeuta padella of Europe); — so called on account of the resemblance of its covering to the fur of the ermine; also applied to certain white bombycid moths of America.

From the entry Ermine.

Webster’s Revised Unabridged Dictionary (1913), from GCIDE 0.54