This unique and timely publication is the first such Catalog to be produced in over 100 years. The last full survey of the taxonomy of the world fauna of the Order Scorpiones was by Karl Kraepelin in 1899 - Scorpiones und Pedipalpi. Das Tierreich. Herausgegeben von der Deutschen Zoologischen Gesellschaft. Berlin. Since then, the sheer number of known species and subspecies has increased more than fourfold, and the classification of scorpions has been greatly transformed at both the generic and familial levels. This new Catalog brings together under one cover an enormous amount of difficult-to-locate information on scorpion nomenclature, biogeography, distribution and phylogeny, published before and after Kraepelin's time. It is of special interest because of the unique status that scorpions currently enjoy as models for the study of evolutionary biology, ecology, toxicology, and physiology.