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The withiid genus Parawithius Chamberlin is rediagnosed, based upon a detailed exam- ination of the type species, P. nobilis (With) from Colombia, which is redescribed and illustrated. The subgenus Parawithius (Victorwithius) Feio is returned to full generic level. Cystowithius, a new genus of Withiidae, is described from high elevation localities in central and South America for four species: Cystowithius smithersinew species (type species) from Ecuador, C. ecuadoricus (Beier) new combination, from Ecuador and Peru, C. colombicus new species from Colombia, and C. chamberlini new species from Mexico and Guatemala. Males of Cystowithius are highly unusual due to the presence of sternal invagi- nations, a feature that has not been previously observed in pseudoscorpions. Populations of Cystowithius smithersi occur within the leaf sheaths of the giant rosette plant Espeletia pycnophylla var. angelensis (Compositae).

journal of arachnology

REMARKS ON THE NEW WORLD PSEUDOSCORPION GENERA PARAWITHIUS AND VICTORWITHIUS, WITH A NEW GENUS BEARING A REMARKABLE STERNAL MODIFICATION (PSEUDOSCORPIONES, WITHIIDAE)