A study of the ecology of a Turbellarian worm, its food, habitat, and behavior. HEIM. 1898. The Biologic Relations Between Plants and Ants. Smithsonian Report for 1896, pp. 411-455. HOPKINS, A. D. 1909. Insect Depredations in North American Forests and Practical Methods of Prevention and Control. U. S. Dept. Agr., Bur. Ent., Bull. No. 58, pp. 57-101. Contains many facts of much ecological value showing the interrelations existing between forests and insects. Good examples of insects as initiators of successions and changes in insect associations. HUBBARD, H. G. 1897. The Ambrosia Beetles of the United States. U. S. Dept. Agr., Div. Ent., Bull. No. 7, N. S., pp. 9-30. The relations of bark beetles to fungi. HUBER, J. 1907. The Founding of Colonies by Atta Sexdens. Smithsonian Report for 1906, pp. 355-372. Ants and fungi. JUDD, S. D. 1901. The Food of Nestling Birds. Yearbook U. S. Dept. Agr. for 1900, pp. 411-436. KEEBLE, F. 1910. Plant Animals, A Study of Symbiosis. pp. 163. Cambridge, England. KIRBY, W., and SPENCE, W. 1859. An Introduction to Entomology; or, Elements of the Natural History of Insects: Comprising an Account of Noxious and Useful Insects, of their Metamorphoses, Food, Stratagems, Habitations, Societies, Motions, Noises, Hybernation, Instinct, Etc., Etc. pp. 607. Seventh edition, London. MARSHALL, G. A. K., and others. 1902. Five Years’ Observations and Experiments (1896-1901) on the Bionomics of South African Insects, chiefly directed to the Investigation of Mimicry and Warning Colours. Trans. Ent. Soc., London, 1902, pp. 287-584. MCATEE, W. L. 1908. Food Habits of the Grosbeaks. U. S. Dept. Agr., Bur. Biol. Surv., Bull. 32. pp. 92. 1913. Index to Papers Relating to the Food of Birds by Members of the Biological Survey in Publications of the United States Department of Agriculture, 1885-1911. U. S. Dept. Agr., Biol. Surv., Bull. No. 43. pp. 69. The Bureau of Biological Survey, and its predecessor, the Division of Ornithology and Mammalogy, have published in the Annual Reports and in numerous bulletins elaborate studies of the foods and habits of birds and mammals. RAUSCHENPLAT, E. 1901. Ueber die Nahrung von Thieren aus der Kieler Bucht. Wiss. Meeruntersuch. heraus. von der Komm. zur wiss. Unter. der deutsch. Meere in Kiel. N. F. Bd. V, Abth. Kiel, pp. 85-151. RILEY, C. V. 1893. Parasitism in Insects. Proc. Ent. Soc. Wash., Vol. II, pp. 397-431. STILES, C. W. 1893. Parasitism. Proc. Ent. Soc. Wash., Vol. III, pp. 1-7. STILES, C. W., and HASSALL, A. 1902--. Index-Catalogue of Medical and Veterinary Zoölogy. U. S. Dept. Agr., Bur. Animal Industry, Bull. No. 39, Parts 1-36 (1912). 1908, 1912. Index-Catalogue of Medical and Veterinary Zoölogy. Subjects: Trematoda and trematode diseases, Bull. No. 37, pp. 401, 1908.--Subjects: Cestoda and Cestodaria, Bull. No. 85. pp. 467, 1912. Hyg. Lab., U. S. Pub. Health and Mar.-Hosp. Serv., Washington. These extensive bibliographies are very useful.