Illustrated Key to Skulls of Genera of North American Land Mammals is a manual that contains illustrations of North American land mammals such as marsupials, shrews, bats, moles among many others. This manual is a well-illustrated key, useful for identifying mammals through cranial characteristics. It also contains line-drawings, and many photographs to aid in identifying related genera. The distribution, diversity, and characteristics of each order and family of land mammals found in North American and to the north of Mexico are briefly discussed. J. Knox Jones, Jr., has been a practicing mammalogist for more than 40 years. Currently he is a Paul Whitfield Horn Professor of Biological Sciences at Texas Tech and a Curator in the Museum there. Jones has authored or edited 14 books among is more than 350 publications, and has studied mammals on five continents. He is a past president of the American Society of Mammalogists and has been awarded the C. Hart Merriam Award, the H. H. T. Jackson Award, and Honorary Membership by that society. In 1992, he was selected as Texas Distinguished Scientist of the Year by the Texas Academy of Science, and was awarded the Donald W. Tinkle Research Excellence Award by the Southwestern Association of Naturalists. Richard W. Manning is a member of the faculty of Southwest Texas State University in San Marcos. He has authored more than 40 publications, most of which deal with mammals. Manning has had considerable instructional experience in laboratories in mammalogy, and has been cited for his excellence in teaching. He is also an avid field biologist, and thus has studied mammals in their natural habitats as well. Manning took most of the photographs used in this laboratory manual and made many of the line drawings.