COUNTY AND DISTRICT DISTRIBUTION, 251 
Yorkshire it has the smallest average leneth of any- 
where in Eneland, while in some other parts of the 
county it grows to + feet. 
The small red viper may be represented in some 
of the small adders of this province, but the smooth 
snake is unrecorded. 
XI. Tyne Province. 
Vipera berus.—Tiis is a province where the adder 
is by far the most common of our serpents, except in 
one locality in the extreme south of Durham. In all 
other parts the adder predominates, some observers 
even considering it the only species indigenous to the 
province. It has the large average length of 2 feet. 
Tropidonotus natriz.—The eastern slopes of the 
Cheviots furnish what ring snakes are found in this 
province; at any rate the species is very rare in 
other parts. 
The small red viper is found in both counties of 
the province, but the smooth snake is, as usual in 
the northern counties, unrecorded. 
XII. Lakes Province. 
Vipera berus—According to the biological system 
of county classification, which is adopted in these 
records, the Isle of Man comes in the Lakes Prov- 
ince. But the report furnished of snakes in the 
island states one thing only—naimely, that there are 
no snakes there at all, so that from an ophidian 
