VOL. XVII, pp. 147-150 OCTOBER 6, 1904 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON DESCRIPTIONS OF NEW SQUIRRELS FROM MEXICO. BY E. W. NELSON. In 1651 Hernandez recorded the presence of flying squirrels in Mexico. The next record south of the United States was in 1861, when Tomes included it in his list of mammals taken hy Salvin at Duenas, Guatemala (P. Z. S., 1861, p. 281). In 1892 I saw a pair of mounted specimens in the museum of the State College at the city of San Luis Potosi. These were re corded as having been taken near Jilitla, in San Luis Potosi. During all of our subsequent work in Mexico, until the present season, whenever in suitable country, both Goldman and I have kept a constant but unsuccessful lookout for these animals. During April, 1904, while in the highlands of Chiapas, near the Guatemala border, Goldman was fortunate enough to secure a good pair of adult flying squirrels with skulls. In view of the striking differences between the Mexican and United States species of Sciurus it was a great surprise to find this isolated repre sentative of SciuropterifS very closely related to forms found in the United States. Both the forms of Sciurus described below are smaller and paler than their most closely-related subspecies occupying ad joining territory. 26 PKOC. BIOI,. Soc. WASH. VOL. XVII, 1904. (147)
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