_viperinus_ (_Tropidonotus_), 165 _viridiflavus_ (_Coluber_), 170 Viscera, 77 _vivax_ (_Ailurophis_), 217 _vosseleri_ (_Tropidonotus tessellatus_, var.), 162 _vulgaris_ (_Natrix_), 152 Warning coloration, 35, 36 Water-Snakes, 92, 94, 160 Whip-Snake, 170 Worms, 110 _Xenopeltidæ_, 5 _Zamenis_, 170 _Zamenis carbonarius_, 172 _Zamenis dahlii_, 177 _Zamenis gemonensis_, 170 _Zamenis hippocrepis_, 179 _Zamenis sardus_, 172 Zoogeographical Regions, 119 ------------------------------------------------------------------------ PRINTED BY BILLING AND SONS, LTD., GUILDFORD ------------------------------------------------------------------------ Footnote A: For a key to the identification of the species, see above, p. 22. Footnote B: The only specimen with twenty-one rows I have examined is a male from Albano, near Rome (Genoa Museum). End of the Project Gutenberg EBook of The Snakes of Europe, by G. A. Boulenger