The new Fascicle concerning Melanocytic Tumors of the Skin follows an identical style and format as its companion on non-melanocytic skin tumors (Fascicle I in this series). Particular emphasis has been placed on presenting descriptions and diagnostic criteria for commonly encountered entities, as well as those rare disorders that often escape mention in conventional texts, e.g. neurotropic malignant melanoma, deep penetrating nevus, and nevi of genital skin. As in Fascicle 1, all disorders are presented according to their salient structural features at scanning magnification as well as at higher magnification for diagnostically critical points. Areas that readers may find particularly useful include: definitive description and clinicopathologic criteria for diagnosis of dysplastic nevi; comprehensive description of nevus and melanoma variants; an extensive discussion of Spitz nevi and variants; meaning, significance, and criteria for diagnosis of minimal deviation mela-noma; and current use of monoclonal antibodies in diagnosis of melanoma. The text is extensive and replete with comparative and summary tables, e.g. Spitz nevus vs. melanoma. The sections on malignant melanoma not only include comprehensive rosters of diagnostic and grading criteria, but also detailed charts and tables from the extensive experience of the Pigmented Lesion Study Group and Database at the University of Pennsylvania that enable prediction of outcome based on morphologic features. This model should promote precision and consistency in melanoma diagnosis, treatment, and follow-up. The clinical and microscopic illustrations are of the high quality that have been synonymous with this series. Dermatologists as well as pathologists will find it indispensable.