Abstract
1. 1. Ten species of Peromyscus collected at various sites from Arizona to Pennsylvania show multiple hemoglobins in eight species and single hemoglobins in two. 2. 2. Eighteen Peromyscus hemoglobins from nine different species show only three different electrophoretic mobilities, and molecular hydridization data suggest that these similarities of charge may extend to subunits of these specific hemoglobins. 3. 3. Ionographic patterns that are characteristic for one species may occur as uncommon genetic variants in another. 4. 4. Electrophoretic mobility and numbers of separable hemoglobins are quite variable among eight additional mammalian species collected while trapping Peromyscus. 5. 5. The five microtine species studied show single hemoglobins of similar mobilities.
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