A Synopsis of the American Bats of the Genus Pipistrellus

This is a biological study book on the different species of the canyon bat (Parastrellus hesperus). Also known as the western pipistrelle, it is a species of vesper bat and is found in Mexico and in the western United States. It is the 1950 publication of E. Raymond Hall and Walter W. Dalquest from the University of Kansas.