Abstract
Nemastoma scabriculum Simon, 1879 turned out to be a group of three closely related species of the Pyrenees in S W Europe (France and Spain). Though the species are similar in general habit they can easily be recognized by external morphology (structure of the apophysis of male chelicerae) and male genital morphology (penial structure). For Nemastoma scabriculum Simon, 1879 sensu stricto a lectotype is designated. The synonymous Nemastoma ventalloi Mello-Leitao, 1936 is considered to be a distinct species and is re-described. The third species of the group is described as new, Centetostoma juberthiei sp. n. Though partly sympatric in their restricted Pyrenean area, the individual species are found to be small-scale allopatric; only twice have two species been found in syntopy in narrowly circumscribed localities. Centetostoma Kratochvil, 1958 is confined to presently comprise one Southwest Alpine and three Pyrenean species.
NSTL