150 Zoological Society. 



experience affirm to be the case. The species now under considera- 

 tion is even later than the Noctule, seldom being seen until the latter 

 has been abroad for an hour ; so late that, excepting on very clear 

 evenings, there is little chance of either observing or obtaining spe- 

 cimens. 



It is probable that they may be seen during the greater part of the 

 summer months, for I remember to have seen and particularly no- 

 ticed them for a long time before I thought of shooting one, and also 

 for a considerable length of time afterwards. They may at any time 

 be known by a person at all conversant with the method of flight of 

 the different species of Bats, by their unsubstantial, butterfly-like 

 appearance. 



Both the specimens which came into my possession in the way 

 alluded to were females, and on dissection contained a single foetus, 

 about half an inch in length ; yet even at this early age the mem- 

 branes were considerably developed, and all the parts bore nearly 

 the same relative proportion to each other as in the adult. 



The auricle of the ear appeared to be nearly, if not quite fully 

 formed, and folded forward over the eyes, reaching almost to the end 

 of the nose. 



When skinned and dissected this Bat was quite free from all un- 

 pleasant smell. 



Dimensions. . r 



in. lin. 



Length of the head and body 1 1\ 



Length of head 7£ 



Length of tail 1 6£ 



Length of the auricle , 6 



Width of ditto 3£ 



Length of the tragus 4 



Width of ditto JL 



Extent of wings 9 2£ 



Length of the humerus 9 



Length of the thumb 2 



Length from the point of the under jaw to the angle of 



the mouth, being the gape-line Q 3 



Dentition. 



i. 4_ ; c. 4v/.'&5-V'*4-i total — • 



6 2 J 6 6 20 



Since the specimen obtained by Brongniart in the neighbourhood 

 of Dover, none are recorded as having occurred till the present time, 

 with the exception of a single specimen mentioned by Professor Mac- 

 Gillivray, from Winchester, and described by him in the ' Naturalists' 

 Library/ vol. xvii. He there states that the ears have M a semi- 

 circular lobe at the base of their outer side, and a wide and deep sinus 

 in their upper half," which certainly is not the case with my speci- 

 mens, the notch being neither wide nor deep, nor the lobe at the base 

 at all distinctly marked. Neither is there any great resemblance to 

 Mr. Bell's figure, taken from Brongniart's ; the ears in that being 

 much narrower in proportion to their length, with the sinus near the 



