250 BRITISH SERPENTS. 
The small red viper oceurs in Lincolnshire, and 
probably in Leicestershire. Coronella austriaca 1s 
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. 
Tropidonotus natriz—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 berus—The adder in Yorkshire exhibits 
ereat 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 jetrie.—Great variation of size is 
shown also in the ring snake here, and in North 
