Pseudocerastes is a genus of vipers endemic to the Middle East and Asia. It was originally created as a monotypic genus in 1896 by Boulenger for the species Pseudocerastes persicus, but three species are now recognised: the spider-tailed horned viper (P. urarachnoides); Persian horned viper (P. persicus) and Field's horned viper (P. fieldi). Like all other vipers, the members of this genus are venomous.