rubens (Coluber), [204]

rubro-maculosus (Tropidonotus tessellatus, var.), [162]

Rustling, [102]

Sand-Boa, [147]

Sand-Snakes, [91]

Sand-Viper, [249]

sardus (Zamenis), [172]

sauromates (Coluber), [183]

scalaris (Coluber), [194]