50 COLOUR VARIATION IN BRITISH ADDERS. 



9. Adder, Male, 22 inches. 



10. ,, ,, 20^ ,, 



11. 20 ,, 



12. >, ,, 19-2- 

 13- l l? 



14. Small Red Viper, Male, 12^ inches. 



Total 10 male and 3 female adders, i red viper. 



15. Ring Snake (Tropidonotus Natrix), 28 inches 

 *O' ,, ,, ,, ,, 32 11 



*7* " " > - > 30 



1 8. ,, ,, 29 with a blunt tail. 



*9' > 3 



20. ,, ,, ,, ,, 34 > 



2I - > > 4 



22. ,, ,, ,, ,, 3 > 



23* > j> > 3^ 



24* T >* 



.25. Slow-worm (Anguis fragilis), i6f inches. 



26. ,, ,, 17 ,, 



Thus, in a few days' actual work I was able to determine the 

 average size of adders and ring snakes in Central Dorset, and 

 also slow-worms were s.een to reach an unusual size. The Vivi- 

 parous lizard (Lacerta vivipars) was also seen, so that the smooth 

 snake and the sand lizard were the only British reptiles not 

 observed. 



