Systematic revision of the neotropical club-tailed scorpions, Physoctonus, Rhopalurus, and Troglorhopalurus, revalidation of Heteroctenus, and descriptions of two new genera and three new species (Buthidae, Rhopalurusinae). (Bulletin of the American Museum of Natural History, no. 415) ; Neotropical club-tailed scorpions