Four New Pocket Gophers of the Genus Cratogeomys from Jalisco, Mexico

"Four New Pocket Gophers of the Genus Cratogeomys from Jalisco, Mexico" by Robert J. Russell is a scientific study analyzing the diversity of pocket gophers in Jalisco, Mexico, written in the early 1950s. The study goes into the specifics of four newly found subspecies within the Cratogeomys genus, focusing on their identification, distribution, and physical traits. The book shows the research results, identifying Cratogeomys gymnurus and Cratogeomys zinseri and introducing the new groups Cratogeomys gymnurus tellus, Cratogeomys gymnurus atratus, Cratogeomys zinseri zodius, and Cratogeomys zinseri morulus. The book offers detailed descriptions of each subspecies' unique physical traits, their locations, and how to tell them apart from other gophers, and also discusses the ecological impacts of gopher distribution and the adaptations that have led to the rise of new groups within a small area.