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I n southern Michigan, deer mice are largely limited to bluegrass fields, where their home ranges rarely reach the edge of adjacent forests (Blair, 1940b), although Howard (1949) has evidence that they occasionally disperse through oak-hickory forest. Along the eastern border of the central grasslands in Texas and Oklahoma, the grassland habitats of this species are interrupted by the intrusion of forests on favorable soils and along streams. In New Mexico, this species occurs commonly in the high mountains, where it is abundant in the dense montane forests (Dice, 1942) and in the desert basins.

The first of these was restricted to the Lepidoptera but, having been published in 1937, is largely out of date. The second, though more recent (1945), covered animals and plantasas a whole, and consequently the space which could be devoted to any one Order was limited. It is not my intention now to catalogue all the work which has been done on this subject, however superficial, but rather to describe and discuss the more important results which have emerged from it. Advances in our knowledge of the polymorphism of the Lepidoptera have been retarded for several reasons.

Mich. 46, 1-58. 1943, Territory and home range concepts as applied to mammals. J. Mammal. 24, 346-352. 1949, Territoriality. J. Mammal. 30, 25-27. , 1948, Mortality and movement of brown rats (Battue norvegicus) in artiflcially supersaturated populations. J. Wildlife Manag. 12, 167-172. Chitty, Dennis, 1937, A ringing technique f o r small mammals. J. A n h . Eaol. 6, 36-53. , 1948, The ecology and management of the prairie spotted skunk in Iowa. Ecol. Monogr. 18, 201-232. , 1938, Home and seasonal ranges of the eastern cottontail in Connecticut.

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