WATER BEETLES IN RELATION TO PONDFISH CULTURE. 
345 
Stein, Friedrich. 
1847. Vergleichende Anatomie und Physiologie der Insekten. Erste Monographie. Ueber die 
Geschlechts-Organs und den Bau des Hinterleibes bei den weiblichen Kafern. 8+139 
pp. Berlin. 
Thomson, Charles Gustav. 
1859. Skandinaviens Coleoptera, Synoptiskt Bearbetade. Vol. 1. Lund. [Enochrus estab- 
lished, p. 18.] 
Ward, John J. 
1914. Some new discoveries in natural history. A tool-using insect. Strand Magazine, vol. 48, 
pp. 523-525, 5 figs. London and New York. 
Wesenberg-Lund, C. 
1913. Biologische Studien fiber Dytisciden. International Review der gesamten Hydrobiologie 
und Hydrographie, ser. 5, No. 1, 129 pp., 9 pis., 5 figs. Leipzig. 
Wickham, H. F. 
1893. Studies on the male tarsus in some adephagous Coleoptera. Bulletin, Laboratories of Nat- 
ural History, State University of Iowa, Yol. II, No. 4, pp. 322-329, Pis. V-VIII. Iowa 
City. [Described the dilated tarsi of three species of Cybister, one of Thermonectes, one 
of Acilius, five of Dytiscus, and one of Colymbetes.] 
1893a. Description of the early stages of several North American Coleoptera. Ibid., pp. 330-344, 
PI. IX. [Included Gyrinus picipes Aube, Dineutes americanus Say, Tropistemus glaber 
Herbst, and Brachinus janthinipennis.] 
1894. On some aquatic larvae, with notice of their parasites. The Canadian Entomologist, Yol. 
XXVI, pp. 39-41. London, Canada. [Included a bombardier beetle and a hymenopter 
on the pupa of Dineutes americanus, and an ichneumon on the pupa of a species of Gyrinus, 
while a pupa of Tropistemus glaber was infested with the maggots of a species of Phora, one 
of the Diptera.] 
1895. On the larvae of Hydrocharis obtusatus and Silpha surinamensis. Entomological News, Vol. 
VI, pp. 168-171, PI. VI. Philadelphia. [An abstract given on page 314.] 
1895a. The Coleoptera of Canada. The Canadian Entomologist, Vol. XXVII, pp. 69-76, 117-122, 
149-153, 181-186, 213-216. London, Canada. 
1911. A list of the Coleoptera of Iowa. Bulletin, Laboratoris of Natural History, State University 
of Iowa, Vol. VI, No. 2, pp. 1-40, Iowa City. 
Wilson, Charles Branch. 
1923. Life history of the scavenger water beetle ( Hydrous ( Hydrophilus ) triangularis) and its eco- 
nomic relation to fish breeding. Bulletin, U. S. Bureau of Fisheries, Vol. XXXIX, 1923- 
24, pp. 9-38, 22 figs. Washington. 
WlNTERSTEINER, FRED. 
1913. Environment of Hydrophilidse. Journal, New York Entomological Society, Vol. XXI, 
pp. 54-55. New York. [All the Hydrophilidse except the Sphseridini are aquatic, yet 
only four genera, Hydrous, Tropistemus, Hydrophilus, and Berosus, can swim. The rest 
crawl about on submerged vegetation.] 
Wright, A. H. 
1920. Frogs: Their natural history and utilization. Appendix VI, Report of the U. S. Commis- 
sioner of Fisheries for 1919, Bureau of Fisheries Document No. 888, 44 pp., 22 pis., 2 figs. 
Washington. [See quotation on page 248.] 
Xambeu, V. 
1894. Moeurset metamorphoses d’insectes [Hydrophilides]. Annales, Societe Linneenne de Lyon, 
N. S., T. 41, pp. 132-135. 
1895. Idem. Ibid., T. 42, pp. 25-42. 
Zaitzev, Ph. 
1908. Catalogue des Coleopteres aquatiques des families des * * * Hydrophilidse. Horae 
Societatis Entomologicae Rossicae, vol. 38, pp. 324-418. St. P5tersbourg. 
