Ellychnia corrusca, the winter firefly, is a species of firefly in the genus Ellychnia. It is a lantern-less diurnal beetle common in the United States, Mexico, and Canada. The adults spend winter on a colony tree, favoring Quercus (oak), Carya (hickory), and Liriodendron tulipifera (tulip poplar).

This beetle can be found in a large variety of habitats but is most notoriously known as a pest. In the maple syrup business, these beetles are commonly found in the buckets of sap from tapped trees.

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