14 VESPERTILIONID^. 



" Serotinus, which has a short, semicordate tragus, has 

 the following dentition, which differs from both the other 

 groups : 



I. I : O.| :F. M. f : M. f=& 



" It will be seen that it is only the false molars which 

 differ, the other teeth being similar in number in all the 

 species of this genus." 



Overlooking the sections above indicated, Count 

 Keyserling and Professor Blasius, in a paper on the 

 European Bats, published in " Weigman's Archives " 

 for 1839, divided the simple-nosed species into pre- 

 cisely the same groups, and gave the generic name 

 Vesperugo to the one having the rounded ears and broad 

 tragus, Vesperus being at the same time proposed as a 

 sub-generic appellation for the group represented by 

 the Serotine Bat. These names have been continued 

 by the above-mentioned authors in all their subsequent 

 writings on the Cheiroptera, and by Professor Blasius 

 in the first volume of his work on the vertebrate 

 animals of Germany, which appeared in 1857. 



But it is now obvious that it was to one of these 

 groups that Dr. Leach long ago applied the name of 

 Scotophilus, the type specimen, still preserved in the 

 national collection, proving, on examination, to be a 

 young example of either the Serotine Bat or of some 

 allied form. The name of Scotophilus should therefore 

 be substituted for Vesperugo. 



In addition to the characteristics of these groups of 

 simple-nosed Bats, as above denned, we now present 

 our readers with the following, attention to which will 

 materially assist in the discrimination of the more easily 

 confounded British species : 



Genus, Vespertilio. Top of the head somewhat elevated, 



