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In the present paper, the taxonomic status of several Hispaniolan members of the genus Tityus C. L. Koch, 1966 is revised after examination of almost all primary types and abundant supplementary material. This resulted in six new synonymies, which involve both extant and fossil species. The extant taxa herein synonymized are Tityus anasilviae Armas et Abud, 2004 under Tityus ottenwalderi Armas, 1999, Tityus bahoruco Teruel et Armas, 2006 under Tityus crassimanus (Thorell, 1876), Tityus ebanoverde Armas, 1999 under Tityus elii Armas et Marcano, 1992, and Tityus septentrionalis Armas et Abud, 2004 under Tityus portoplatensis Armas et Marcano, 1992. The fossil taxa herein synonymized are Tityus azari Lourenço, 2013† and Tityus (Brazilotityus) hartkorni Lourenço, 2009†, both under Tityus geratus Santiago-Blay et Poinar, 1988†. Updated distribution maps are given for all extant senior synonyms. [ABSTRACT FROM AUTHOR]

Two new scorpion species of the family Buthidae are described herein: Microtityus vieques sp. n. (a member of the subgenus Parvabsonus Armas, 1974) and Tityus alejandroi sp. n. (belonging to the "quisqueyanus" species-group). Both were collected from pitfall traps in the Puerto Rican satellite island of Vieques, in the Greater Antilles, and the former represents the first official record of the occurrence there of the gens Microtityus Kjellesvig-Waering, 1966. As expected, the new species have their closest relatives in Puerto Rico. Fully illustrated descriptions and detailed comparisons are provided. Additionally, two other Puerto Rican species of Tityus currently not assigned to any group are herein formally transferred to the "quisqueyanus" species group: Tityus angelesae Santiago-Blay, 2009 and Tityus juliorum Santiago-Blay, 2009. After this contribution, the scorpion fauna of Puerto Rico is now composed of 19 species. [ABSTRACT FROM AUTHOR]