1905. The Cocooning Habits of Spiders. Kans. Univ. Sci. Bull., Vol. III, pp. 85-114. SEITZ, A. 1891. Allgemeine Biologie der Schmetterlinge. Zool. Jahrb., Abth. Syst. Geog. Biol. der Thiere, Bd. V, pp. 281-343. SETON, ERNEST THOMPSON. 1909. Life Histories of Northern Animals. Vol. I, pp. 673, and Vol. II, pp. 677-1267. New York. Valuable for life histories and habits. Extensive bibliography. SEVERIN, H. H. P. and H. C. 1911. An Experimental Study on the Death-Feigning of Belostoma (= Zaitha Aucct.) flumineum Say and Nepa apiculata Uhler. Behavior Monographs, Vol. I, No. 3, pp. 1-44. SHELFORD, V. E. 1908. Life-Histories and Larval Habits of the Tiger Beetles (_Cicindelidæ_). Jour. Linn. Soc. Zoöl., Vol. XXX, pp. 157-184. SHELFORD, V. E., and ALLEE, W. C. 1913. The Reactions of Fishes to Gradients of Dissolved Atmospheric Gases. Jour. Exp. Zoöl., Vol. XIV, pp. 207-266. The reaction of fish to oxygen and carbonic acid; the latter is considered the best single index to the environment. SIMPSON, C. T. 1899. The Pearly Fresh-water Mussels of the United States; their Habits, Enemies, and Diseases; with Suggestions for their Protection. U. S. Fish Comm. Bull. for 1898, Vol. XVIII, pp. 279-288. SLADEN, F. W. L. 1912. The Humble-Bee, its Life-History and how to Domesticate it. pp. 283. London. A very valuable account of the British species, with numerous suggestions on methods of studying them. SMALLWOOD, M. E. 1903. The Beach Flea: Talorchestia longicornis. Cold Spring Harbor Monogr. I. pp. 27. 1905. The Salt-Marsh Amphipod: Orchestia palustris. Cold Spring Harbor Monogr. III. pp. 21. Both of these papers discuss habits and life histories. SMITH, B. G. 1907. The Life History and Habits of Cryptobranchus Allegheniensis. Biol. Bull., Vol. XIII, pp. 5-39. Contains references to other salamanders. STOCKARD, C. R. 1908. Habits, Reactions, and Mating Instincts of the “Walking Stick,” Aplopus Mayeri. Carnegie Inst. Pub. No. 103, pp. 43-59. TOWER, W. L. 1906. Habits and Instincts in Leptinotarsa. pp. 229-257. In An Investigation of Evolution in Chrysomelid Beetles of the Genus Leptinotarsa, Carnegie Inst. Pub. No. 8. Washington, D.C. TUTT, J. W. 1897. The Drinking Habits of Butterflies and Moths. Proc. South London Ent. and Nat. Hist. Soc., 1897, pp. [1-9]. VOIGT, W. 1904. Über die Wanderungen der Strudelwürmer in unseren Gebirgsbächen. Verhand. naturhis. Ver. der preuss. Rheinlande, Westfalens und des Regiersungsbezirks Osnabrück, Jahrg. 61, pp. 103-178. Shows the relation of behavior to the local distributions of Planarians. WAGNER, W. 1907. Psycho-biologische Untersuchungen an Hummeln mit Bezugnahme auf die Frage der Geselligkeit im Tierreich. Zoologica (Chun), Bd. XIX, Heft 46, pp. 1-239. An important study of the behavior of _Bombus_. WALTER, H. E. 1906. The Behavior of the Pond Snail, _Lymnæus Eleodes_ Say. Cold Spring Harbor Monogr. VI. pp. 35. WASMANN, E. (Trans.)