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[awl-der-flahy] /ˈɔl dərˌflaɪ/
noun, plural alderflies.
any of several dark-colored neuropterous insects of the family Sialidae, the larvae of which are aquatic and predacious on other aquatic insects.
1820-30; alder + fly2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Encyclopedia Article for alderfly

any insect of the megalopteran family Sialidae, characterized by long, filamentous antennae and two pairs of large wings (anterior wing length 20 to 50 mm [ 34 inch to 2 inches]), membranous and well-developed, with part of the hind wing folding like a fan. The adult alderfly is dark-coloured, 15 to 30 mm (35 inch to 1 15 inches) long, sluggish, and a weak flier. It usually inhabits shore vegetation, especially alder trees.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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