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F. M. Carpenter, A Revision of the Nearctic Hemerobiidae, Berothidae, Sisyridae, Polystoechotidae and Dilaridae (Neuroptera), Proceedings of the American Academy of Arts and Sciences, Vol. 74, No. 7 (Dec., 1940), pp. 193-280
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James Michael Carpenter (1940) studied this question.
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