Snakes from the Cueva Tixi archeologic site (Late Pleistocene-Holocene), Buenos Aires province, Argentina.

The snakes from the Cueva Tixi archeologic site (Late Pleistocene-Holocene) in the Sierras de Tandilia area, are described. The remains consist mainly in precaudal isolated vertebrae. The colubrids Clelia rustica (Cope) and P hilodryas patagoniensis (Girard) and the viperid Bothrops alternatus (Dumer il et al.) are identified; the latter species is the most abundant. The thr ee species are common in the Sierras de Tandilia area at present. Clelia ru stica and P, patagoniensis are recorded from the middle Holocene onwards, a nd B, alternatus since the late Pleistocene.