276 ENTOMOLOGICAL NEWS. [June, 'l/ 



a season, one reaching the adult stage in June, the other in 

 August. Since these insects draw quite largely in their young 

 stages upon the ostracods and similar organisms, which repre- 

 sent a chief food supply for young fish, as well as preying 

 upon small fish directly, as has been noted several times, they 

 deserve more careful study. This task is greatly facilitated 

 by a workable key to the species and by some knowledge of 

 their feeding habits. 



BIBLIOGRAPHY. 

 AMYOT, C. J. B., et AUDINET SERVILLE, 1843. Histoire naturelle des 



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in: Zoolog. Jahrb., 33 Band, 2 Heft. 1913. (A response to Hoppe's 



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 BUENO, J. R. DE LA TORRE, 1905. The Genus Notonecta, in America 



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Hemipterology. Can. Ent. 40, p. 211. 

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Nat. Vol. XVI, p. 577. 

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442, Aug. ist, pp. 198-207. 



DE GEER, 1778. Memoires pour servir a 1'histoire des insectes. 

 ESSENBERG, CHRISTINE, 1915. Habits and Natural History of the Back- 

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GARMAN, H., 1888. Bulletin Illinois State Laboratory of Natural His- 

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HUNGERFORD, H. B., 1917. The Egg Laying Habits of a Back-swim- 

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