Alder fly



any of several dark-colored neuropterous insects of the family Sialidae, the larvae of which are aquatic and predacious on other aquatic insects.
Historical Examples

All trout, particularly rainbows, take an alder fly readily.
Chats on Angling H. V. Hart-Davis

noun
any of various neuropterous insects of the widely distributed group Sialoidea, such as Sialis lutaria, that have large broad-based hind wings, produce aquatic larvae, and occur near water

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