136 ECONOMIC MAMMALOGY 



two months. 11 Squirrels, chipmunks, mice, mongooses, European hedge- 

 hogs and rabbits all eat land snails. 12 The food of the sea otter is said 

 to consist of clams, mussels and sea urchins. 13 Opossums eat some 

 crustaceans and mollusks. 14 Seals, walruses and whales consume large 

 quantities of mollusks, crustaceans and other invertebrates. 15 Probably 

 many arachnids, crustaceans and slugs are eaten by various species of 

 mice. The grasshopper mouse becomes the "scorpion mouse" in re- 

 gions where scorpions are abundant, because of its fondness for the 

 scorpions as part of its diet. 16 



11 Shull, Amer. Nat.,^ XLI, 495-522, 1907. Hamilton, Journ. Mammalogy, xi, 27-30, 

 33, I93O- Clench, Nautilus, xxxix, 28, 1925. Hahn, 33rd Ann. Kept. Indiana Dept. 

 Geol. and Nat. Res., for 1908, p. 601, 1909. Babcock, Science, XL, 526, 530, 1914. 



12 Elrod, Univ. Montana Bull. No. 10, p. 114, 1902; Nautilus, xvn, 4, 1903. Van 

 Hyning, Nautilus, xvui, 23, 1904. Bailey, N. Amer. Fauna, No. 49, p. 205, 1926. How- 

 ell, N. Amer. Fauna, No. 45, p. 21, 1921 ; No. 52, pp. 9-11, 1929. Ingersoll, The life of 

 animals, 1907. Pilsbry and Bequaert, Bull. Amer. Mus. Nat. Hist., LIII, 479, 539-540, 

 1927. Wright, Journ. Conch., xn, 268, 1922. Oldham, Journ. Conch., xvui, 335, 1929. 

 Lawson, Journ. Conch., xvui, 327-328, 1929. Taylor, Monog. land and freshwater Mol- 

 lusc a British Isles, in, 281. 



13 Elliott, The sea otter and its hunting, Kept, on Condition of Affairs in the Terr, 

 of Alaska, Washington, 1875, pp. 54-62. Coues, N. Amer. Mustelidae, p. 345, 1877. 



"Hahn, 33rd Ann. Kept. Indiana Dept. Geol. and Nat. Res., 1908, p. 451. 



15 Bartlett, Journ. Mammalogy, vui, 207-212, 1927. Dice, California Fish and Game, 

 xiv, 1-16, 1928; vui, 135, 1922. Huey, Journ. Mammalogy, v, 237-243, 1924; vi, 126, 

 1925. Dall. Ann. Rept. Smithsonian Inst. for 1901, pp. 687-688. Evermann, Scientific 

 Monthly, xv, 309-310, 1922; xvi, 526-527, 1923. Dyche, Trans. Kansas Acad. Sci., 

 xvin, 179-182, 1902. Merriam, Science, xni, 777-779, 1901. 



"Merriam, N. Amer. Fauna, No. 3, pp. 59, 61, 1890. Gary, ibid., No. 33, p. 100, 

 1911. Bailey, Animal life of Carlsbad Cavern, 1928. 



