Centruroides granosus (Thorell, 1876) is redescribed based on several specimens of both sexes from Panama. We demonstrate that the original description of this species was based on an immature (subadult) male, which is herein designated as the lectotype. We conclude that Centrurus granosus simplex Thorell, 1876 is a senior synonym of Centruroides testaceus arubensis (Bakker, 1963), and elevate it to species level: Centruroides simplex (Thorell, 1876), comb. nov. Resumen Se redescribe Centruroides granosus (Thorell, 1876) sobre la base de varios ejemplares de ambos sexos provenientes de Panamá. Se demuestra que la descripción original de esta especie estuvo basada en un macho inmaduro (subadulto), el cual es aquí designado como lectotipo. También se concluye que Centrurus granosus simplex Thorell, 1876 representa un sinónimo anterior de Centruroides testaceus arubensis (Bakker, 1963), la cual es elevada a la categoría de especie: Centruroides simplex (Thorell, 1876), comb. nov.

Centruroides edwardsii (Gervais, 1843) comb. nov. is restored as a valid species, and a male neotype from Riohacha, La Guajira Department, Colombia is herein designated; this species ranges from Mexico through Colombia, but there are no reliable records from Guatemala, Belize, and Panama; introduced populations also occur in Cuba (West Indies) and Senegal (Africa). We regard the following species as its junior synonyms: Scorpio (Atreus)

The true identity of the enigmatic scorpion Rhopalurus pintoi Mello-Leitão, 1932 is herein finally clarified, on the basis of new specimens collected near the type locality: it is demonstrated to be a senior synonym of Rhopalurus piceus Lourenço & Pinto-da-Rocha, 1997, as it was already suspected. The species is redescribed, and some topics on taxonomy, geographical distribution and ecology are commented for this species and Rhopalurus crassicauda Caporiacco, 1947.

EDITOR: Victor Fet, Marshall University, 'fet@marshall.edu' ASSOCIATE EDITOR: Michael E. Soleglad, 'soleglad@la.znet.com'Euscorpius is the first research publication completely devoted to scorpions (Arachnida: Scorpiones). Euscorpius takes advantage of the rapidly evolving medium of quick online publication, at the same time maintaining high research standards for the burgeoning field of scorpion science (scorpiology). Euscorpius is an expedient and viable medium for the publication of serious papers in scorpiology, including (but not limited to): systematics, evolution, ecology, biogeography, and general biology of scorpions. Review papers, descriptions of new taxa, faunistic surveys, lists of museum collections, and book reviews are welcome. Derivatio NominisThe name Euscorpius Thorell, 1876 refers to the most common genus of scorpions in the Mediterranean region and southern Europe (family Euscorpiidae).Euscorpius is located on Website 'http://www.science.marshall.edu/fet/euscorpius/' at Summary A new species of the genus Rhopalurus Thorell, 1876 is herein described from northeastern Colombia; the new species is closely related to (and has been previously confused with) Rhopalurus laticauda Thorell, 1876. Also, some comments on the taxonomy and distribution of the latter taxon are included.

Androctonus tenuissimus sp. n. from two coastal localities placed in northwestern Egypt is herein described, an addition that represents the fifth species of this genus confirmed to occur in this North African country. It is most closely related only to Androctonus bicolor Ehrenberg, 1828, which is widely distributed across northeast Africa and the Middle East and also occurs in Egypt. Both are the only species in the genus whose adults of both sexes show the following combination of three diagnostic characters: coloration uniformly blackish, pedipalp chelae conspicuously narrower than patella in adults, and pedipalp fingers with basal lobe/notch combination entirely absent. However, these two taxa can readily be distinguished by very marked differences in appendage attenuation, body sculpture and counts of principal rows of denticles on pedipalp fingers, among other characters.

A new species of Ananteris Thorell, 1891 is herein described from a single locality placed in the Cordillera Central of Colombia, which represents the first record of this genus for Tolima department. This new taxon exhibits several singular features, and apparently represents a relict population inside an urbanized area. Also, some aspects on the taxonomy of the genus are briefly discussed, and its diagnosis is emended. With this addition, the total of Ananteris species described from Colombia is raised to six.

Chaneke fogoso gen. nov. et sp. nov., are described based on specimens collected near the coast in southeastern Guerrero, Mexico. The genus is characterized by the peculiar rhomboida! shape of the subaculear tubercle, and the lack of at least one trichobothrium on the femur, patella and chela of the pedipalp, which make it the second known buthid genus with decreasing neobothriotaxy on those three pedipalpal segments, together with Alayotityus Armas 1973. Tityopsis ciliciae Armas & Martin-Frias 1998, from Oaxaca, Mexico, is transferred to the new genus, resulting in Chaneke aliciae (Armas & Martin-Frias 1998), comb. nov. A cladistic analysis including all other New World "microbuthids" with decreasing neobothriotaxy, with 30 morphological characters, indicates that Chaneke is monophyletic, clearly distinct from Alayotityus Armas 1973 (from eastern Cuba) and Tityopsis Armas 1974 (from western Cuba).

Euscorpius is the first research publication completely devoted to scorpions (Arachnida: Scorpiones). Euscorpius takes advantage of the rapidly evolving medium of quick online publication, at the same time maintaining high research standards for the burgeoning field of scorpion science (scorpiology). Euscorpius is an expedient and viable medium for the publication of serious papers in scorpiology, including (but not limited to): systematics, evolution, ecology, biogeography, and general biology of scorpions. Review papers, descriptions of new taxa, faunistic surveys, lists of museum collections, and book reviews are welcome. Derivatio Nominis The name Euscorpius Thorell, 1876 refers to the most common genus of scorpions in the Mediterranean region and southern Europe (family Euscorpiidae).