250 BRITISH SERPENTS. 



The small red viper occurs in Lincolnshire, and 

 probably in Leicestershire. Goronella austriaca is 

 unknown in the Trent Province. 



IX. Mersey Province. 



Vipera berus. — The adder is not common in this 

 area, which is not surprising when one considers 

 the immense population included in the province, 

 especially in the South and West Lancashire por- 

 tions. Even in Cheshire it is seldom met with, and 

 does not exceed an average of 18 inches. 



Trojridonotus natrix. — Delamere Forest in Cheshire 

 holds a good many ring snakes, the average length 

 being 3 feet. This species is by far the most common 

 in the Mersey Province. 



Neither the small red viper nor the smooth snake 

 occur, as far as known at present. 



X. Humber Province. 



Vipera bents. — The adder in Yorkshire exhibits 

 great variation, the size of the county being so great 

 as to allow of vastly different local conditions in 

 various localities. Thus the size is found ranging 

 from 15 to 27 inches, two species being probably 

 involved. In the south and east of the province 

 the adder is probably more common than the harm- 

 less species. 



Tropidonotus natrix. — Great variation of size is 

 shown also in the ring snake here, and in North 



