The Snakes of Europe

by George Albert Boulenger

8. Cœlopeltis monspessulana (Mediterranean Littoral).

9. Vipera ursinii (Basses-Alpes).

10. Vipera berus (as far south as the Loire basin, the Central Plateau, and the Alps).

11. Vipera aspis (as far north as the Loire basin, Fontainebleau, and Lorraine).

VI. Spain and Portugal

1. Tropidonotus natrix.

2. Tropidonotus viperinus.

3. Zamenis gemonensis (Catalonia).

4. Zamenis hippocrepis (absent from the north).

5. Coluber longissimus (Andalucia).