Biochemical Polymorphism and Systematics in the Genus Peromyscus. VI. The Boylii Species Group

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Abstract
An analysis of electrophoretic variation in proteins encoded by 21 genetic loci in 275 individuals belonging to the Peromyscus boylii species group yielded the following systematic conclusions. Populations of P. boylii rowleyi and P. b. levipes in four Mexican states and four states in the southwestern United States, separated by up to 3000 kilometers, share common alleles at virtually all loci, and thus show no evidence of representing more than one species. P. (b.) attwateri from Arkansas differs from P. boylii in allelic composition at several loci, and in all probability represents a distinct species, as suggested by other authors on the basis of morphology and karyotype. P. stephani from the Gulf of California is very similar genically to P. boylii, and, on the basis of this and other evidence, should be removed from the subgenus Haplomylomys and placed in the boylii species group of the subgenus Peromyscus. Populations referable to P. pectoralis from Ciudad Victoria, Mexico, Ranger, Texas, and Big Bend, Texas, show considerable allelic differences from one another but form a single cluster in a dendrogram of biochemical similarities. The nature of the allelic differences suggests that two or more species currently are classified as P. pectoralis.

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