Central America is one of the world's foremost biodiversity hotspots, a region characterized by a high level of species richness and endemism. This book is a completely up-dated and fully illustrated guide to the 533 species of reptiles that are known to occur in the region extending from the Isthmus of Tehuantepec in Mexico to the southern extent of the Panamanian isthmus (southern Mexico, Guatemala, Belize, El Salvador, Honduras, Nicaragua, Costa Rica, Panama). It is based on extensive field research carried out by the author and also on a thorough analysis of the scientific literature, producing a Literature Cited section of several hundred entries.