Ears oblong, shorter than the head, bending outwards and notched on their external margins; tragus half the length of the auricle, lanceolate, straight: a moustache of fine close hairs on the upper lip : fur blackish chestnut above, dusky ash beneath.
V. mystacinus, Desm. Mammal, p. 140.
Length of the head and body one inch eight lines; of the head seven lines and a half; of the tail one inch five lines; of the ears five lines and a half; of the tragus three lines; breadth of the ears three lines and a half; of the tragus at the base one line; length of the forearm one inch three lines; of the thumb two lines and a half: extent of wing eight inches six lines.
Head small and flattish; muzzle short; nose swollen, with a shallow cleft in the middle; face much more hairy than in the last species, with a few scattered hairs on the nose and chin, longer than the rest, intermixed; a row of fine, soft, close-set hairs on the upper lip forming a conspicuous moustache; a similar row crossing the forehead: ears shorter than the head, moderately broad, oblong, rounded at the extremities, curving outwards and rather deeply notched on their external margins; tragus half or rather more than half the length of the auricle, lanceolate, perfectly straight, narrowing regularly from the base upwards to the tip which terminates in a sharp point: thumb moderate: hind feet much smaller than in the last species: interfemoral with the spur of about the same length: tail longer than the fore-arm, exserted for about one line. Fur long, thick and woolly; hair dusky, approaching to black, throughout the greater part of its length, the extreme tips being reddish brown on the upper parts and ash-gray beneath: ears, flying and interfemoral membranes dusky; this last sometimes transversely marked on its under surface with numerous white ciliated lines.
This species occurs, though rarely, in houses in Cambridgeshire. I have also received specimens from Milton Park in Northamptonshire. Mr Yarrell has others which were taken at Colchester in the caverns under the castle. Said to frequent the neighbourhood of water, and to retire into hollow trees and houses.
(2. Plecotus, Geoff).