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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]

In the present note, we report for the first time the genus Microtityus Kjellesvig-Waering, 1966, from Puerto Rico, on the basis of two new species belonging to the subgenus Parvabsonus Armas, 1974. One of them occurs in the southwest of the main island and is morphologically most similar to Microtityus virginiae Armas, 1999, from Hispaniola, while the other occurs in a small satellite islet offshore the northeast coast and somewhat resembles Microtityus waeringi Francke & Sissom, 1980, from the Virgin Islands. [ABSTRACT FROM AUTHOR]