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1.         Adults less than 25 mm in length; oceli absent 4th tarsal segment dilated. . . . . . . . . . . . . . . . .             . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sialidae, Sialis Lateille

            Adults over 25 mm in length; ocelli present; 4th tarsal segment simple. . . . . . . . .Corydalidae

 

Key to Megaloptera Adult Families

From Flint, Evans & Neunzig, 2008