eristicophis is a monotypic genus made for the venomous viper species ""e. macmahonii". it is found in the desert areas near the borders of iran, pakistan, and afghanistan. there are currently no subspecies recognized. the e. macmahonii is also known as the "mcmahon's viper", the "asian sand viper", the "leaf-nosed viper", and the "whiskered viper"".