"A New Species of Pocket Gopher (Genus Pappogeomys) From Jalisco, México" by Robert J. Russell is a scientific publication written in the mid-20th century. This short work focuses on the description and classification of a newly identified species of pocket gopher, specifically from the genus Pappogeomys, found in the Sierra del Tigre region of Jalisco, México. The book contributes to the field of mammalogy by detailing the ecological and anatomical features that distinguish this species from its closest relatives. The content details the findings from specimens collected primarily by Joseph R. Alcorn, with a particular emphasis on the unique characteristics that differentiate the newly recognized species, named Pappogeomys alcorni, from Pappogeomys bulleri. The book provides habitat information, morphological comparisons, and specific anatomical details such as dental and skull characteristics. Russell articulates the significance of these findings in understanding the biodiversity of mammals in this region of México and acknowledges Alcorn's contributions to this field of study. (This is an automatically generated summary.)