Karyotypes of Three Subspecies of Peromyscus

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Abstract
Karyotypes of Peromyscus maniculatus gracilis Le Conte, Peromyscus maniculatus bairdii Hoy and Kennicott, and Peromyscus leucopus noveboracensis (Fischer) from southern Ontario were studied to determine whether or not identification of these animals can be made on a cytological basis. The karyotypes as determined from metaphase plates of bone marrow and newborn splenic tissue confirm the diploid number of 48 in each case as given by Makino (1951) and are sufficiently distinct to permit positive identification of each subspecies.