from Mt. Malinche, 8400 ft., Tlaxcala.

1909. Peromyscus boylei levipes, Osgood, N. Amer. Fauna, 28:153, April 17.

Remarks.—A precise diagnosis for P. b. levipes is difficult to prepare because some geographic variation in color and in the cranial characters is present within the range of the subspecies as here understood. For instance there is a gradual cline of decreasing size to the northward in nearly all measurements, but the ratio of length of tail to length of head and body does not present such a cline; mice from several localities in San Luis Potosí have a relatively shorter tail than do mice from farther north and from farther south. Also, specimens labeled in reference to Zacualpilla, Jacales, Jacala, Tulancingo, and San Miguel Regla average slightly darker dorsally than do typotypes. Some of these specimens are reddish on the cheek and lateral line. Specimens from San Luis Potosí resemble topotypes, but some specimens from northeastern localities in that state have cinnamon or brownish upper parts and are intermediate in coloration between populations of levipes to the south and populations of the same subspecies to the north from the Sierra Madre Oriental and the Sierra de Tamaulipas. Specimens from these two sierras have a cinnamon-reddish color that is more intense in specimens from the Sierra de Tamaulipas.

Osgood (1909:153) recorded P. b. levipes as occurring from central Nuevo León south through San Luis Potosí, Hidalgo, and Veracruz to southern Oaxaca. Actually specimens from Nuevo León and from most parts of Veracruz differ subspecifically from levipes and also from each other. In Veracruz, P. b. levipes is known only from the northwestern part.