01 Any of numerous dark-colored neuropterous insects of the genus Sialis or allied genera. They have predaceous aquatic larvæ, which are used …
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1.
Any of numerous dark-colored neuropterous insects of the genus Sialis or allied genera. They have predaceous aquatic larvæ, which are used for bait.
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2.
An artificial fly with brown mottled wings, body of peacock harl, and black legs.(Angling)