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The geographic and rwn-geographic variation of Peromyscus melanotis are studied analyzing 1485 museum specimens from 125 bcalities along the Transversal Volcanic Belt. Using univariate and multivariate techniques, the behavior of 25 morphometric characters (21 characters from the skuli and four from the skin) was studied. The rK)n-geographic variation ineludes the ontogenetic variation, the secondary sexual variation, and the coloration variation. For the ontogenetic analysis the specimens were grouped into five age clases. It was found that the quantitative value of the characters increases with age and that adulthood is reached at age class IV. The secondary sexual variation shows that Peromyscus melanotis presenta secondary sexual dimorphism since youth. Dimorphism is more evident in adulthood, this was found in the behavior of 14 of the 25 analysed characters. Pernales are bigger than males. The Peromyscus melanotis coloration is related to the specimen age and the season of the year. Young specimens always show dark coloration in any season of the year and, as they grow oid, they become lighter. During the year there are two distinguishable coloration phases: a dark One which corresponde to the summer’s specimens and a light one which corresponde io the winter’s specimens. In the geographic vahation analysis only adutts were considerad to which 16 morphometric characters and the coloration were analyzed. These specimens carne from localities along an west-east orientad transect begining in Cerro San Andres, Michoacan and ending in Pico de Orizaba, Veracruz. Most of the characters showed limited geographic variaiion. The bigger and lighter specimens were found in the central mountains of the transect (Popocatepetl- Iztaccihuatl group), whereas smaller and darker specimens where found at the extremes.

VARIACION INTRAPOBLACIONAL E INTERPOBLACIONAL DE PEROMYSCUS INEIANOTÍS (RODENTIA: MURIDAE) EN EL EJE VOLCANICO TRANSVERSO, MEXICO