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III. The distinctive Characters of two British Species of Plecotus, 
supposed to have been confounded under the Name of Long-eared 
Bat. By the Rev. Leonard Jenyns, M.A. F.L.S. Communi- 
cated by the Zoological Club of the Linnean Society. 
Read March 4, 1828: 
Tue qup Plecotus, originally instituted by Geoffroy for the 
reception of the Vespertilio auritus and the V. barbastellus of 
Linnz;us and Gmelin, has not, that I am aware, met with any 
European additions from the discoveries of later times. I am 
on this account desirous of drawing the attention of naturalists 
to a third British species referable to this group, which may be 
considered either as entirely new, or at least one which has never © 
been clearly distinguished from the former of the two above 
mentioned. I am the more anxious to do this, from a strong per- 
suasion that the smaller species of the Vespertilionide still require 
much investigation, and that even in our own island many others, 
besides those recorded, remain to be ascertained. 
This Bat, of which I have never met with more than one spe- 
cimen, was discovered some years back, in the month of July, 
by Professor Henslow and myself, adhering to the bark of an 
old pollard willow, on the edge of Grunty Fen, in the Isle of 
Ely. Itisa female; and, in a general point of view, so nearly 
resembles the Common Long-eared Bat of English authors, that 
the two might be easily confounded; nor, indeed, did I myself 
conceive it to be anything more than a young individual of that 
species 
