174 CATALOGUE OF THE MAMMALIA OF 
2. A. acrestis, Fleming. Freup Voir. Sxort-Tartep Freip 
Movse. 
A. arvalis, Gmel. 
This species is common throughout our district. A fine male 
which we obtained near Chollerford last year measured 53 inches 
in length. 
A species closely allied to this, but exceeding it in size, was 
discovered by Mr. Thompson on the Perthshire and Inverness- 
shire moors, and described in the Ann. N. H., VII. p. 270, under 
the name of A. neglecta. It should be looked for on the moors 
and uplands of our district, where it is extremely likely to occur. 
3. A. riparia, Yarrell. Bank VOLE. 
A. pratensis? Baillon; A. rubdus? Baillon (De Selys 
Longchamps). 
As the synonymy of this species appears to be doubtful, we 
use Yarrell’s name for it, although Baillon’s has the priority. 
English writers refer it to his A. pratensis; Continental writers, 
however, place it under his A. rubedus. 
Mr. Selby records the occurrence of this species at Twizell in 
the Mag. Zool. and Bot. 1838, Vol. II. p. 92. 
Two specimens, male and female, were taken at the same time 
in a hang trap, baited with oatmeal, in the garden at Twizell. 
Dr. Johnston records its occurrence near Berwick, close to the 
borders (Proc. Berw. Club I. 24), and we have no doubt it is 
generally, though perhaps not abundantly, distributed over our 
district. 
II, CASTOR, Linn. 
1. C. riper, Linn. BEAver. 
Though long since extinct in our district, it was to be met 
with in our rivers quite within the historic period, and probably 
down to the time of Henry I., wheu it appears that an export 
duty of fourpence each on the skins of this animal was authorised 
to be levied at Newcastle-on-Tyne. (See a paper by Dr. Watson 
in Proc. Berw. Club. IV. 81.) 
