HUNGERFORD: AQUATIC HEMIPTERA. 263 
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~SCHMIDT SCHWEDT, E., 1891. In Zacharias Tier und Pflanzenwelt des 
Susswassers. 
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Simpson, S. G., 1848. Quoted by Dr. Spence in Trans. Ent. Soc., London, 
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long. 
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: See pp. 316-328.) 
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