Book digitized by Google from the library of University of Michigan and uploaded to the Internet Archive by user tpb. Thesis (Ph. D.)--Cornell university' 1912 Plates printed on both sides "Reprinted from Annals Entomological society of America, vol. VI, no. 3., September, 1913." "Contribution from the Limnological laboratory of Cornell university." Bibliography: p. 401-411
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