Speciation in Peromyscus

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Abstract
The forms differentiated within Peromyscus may roughly be classified according to degree of distinction as local races, subspecies or geogr. races, spp., species groups, and subgenera. Different subgenera and different species groups, so far as they have been tested in this genus, are completely intersterile. Within the P. truei species-group 2 included spp. are partially intersterile. In 2 other Peromyscus species-groups the included spp. are potentially interfertile, but in nature are separated partly by geogr. and partly by psychological (sexual) barriers, so that no interbreeding occurs. Within any sp. of Peromyscus all the subspp., so far as tested, are potentially interfertile, but in nature some adjacent subspp. are separated by geogr., by ecol., or by sexual barriers. Sexual isolation seems in this genus to be of especial importance in speciation.

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