3. Vipera berus.
III. Belgium and Holland
1. Tropidonotus natrix.
2. Coronella austriaca.
3. Vipera berus.
IV. Germany and Denmark
1. Tropidonotus natrix.
2. Tropidonotus tessellatus (Middle Rhine and Moselle, Saxony).
3. Coluber longissimus (Denmark, Schlangenbad, Treves).