160 M. L. H. Jeitteles on Amblyotus atratus, Kolenati. 



at the same time much lower than the inner point of the first 

 tooth, — also by the termination of the outer margin of the ear 

 neither below the line of the cleft of the mouth, nor close to its 

 angle, and, finally, by the golden lustre of the dorsal hairs. 

 And, from both species, Amblyotus atratus^ Kolen., differs most 

 strikingly in its foldless ears and in the formation of the 

 tragus, which is quite different from that of any other species 

 of Vesperugo. From Vesperugo maurus^ Bias., with which 

 the Altvater Bat agrees in respect of the golden lustre of the 

 dorsal hairs, it differs in the position of the lower incisor teeth, 

 in the want of the second unicuspid molar in the upper jaw, 

 and in the structure of the ear. 



Kolenati's new Bat consequently really forms a good species. 

 And the establishment of a new genus also appears to be justi- 

 fied, as this Chiropter differs, in the structure of the ear and 

 the very inconsiderably developed membranous lobe of the 

 spur-bone, from all other species of the genus Vesperugo^ Keys. 

 & Bias., and likewise from those of the genus Vespertilioj 

 Linn. 



The generic character of Amhlgotus, Kolenati, should there- 

 fore be as follows : — 



" Above four, beneath five molar teeth on each side. Ears 

 without folds, with the outer margin terminating in front of 

 the tragus. Tragus convexly curved at the upper third of 

 its inner margin, with the rounded extremity bent upwards 

 and outwards. The spur-bone on the hind foot bears an ex- 

 tremely narrow, straight, lateral membranous lobe." 



From this it appears that this genus, as already remarked 

 by Kolenati, constitutes a true intermediate form between the 

 genera Vesperugo and Vespertilio. 



The species Amblyotus atratus^ Kolen., may be thus charac- 

 terized : — 



" Ears much shorter than the head. Wing-membrane at- 

 tached to the base of the toes. Tip of the tail freely projecting 

 from the interfemoral membrane. Edges of the lower incisor 

 teeth standing in the direction of the jaw. First upper incisor 

 bicuspid, rather higher, and in transverse section much stronger 

 than the second. Muzzle broad and obtuse, sparsely hairy, 

 black. Dorsal hairs with golden lustre." 



I have still to express the opinion that this remarkable ani- 

 mal may be a hybrid, possibly of Vesperugo Nilssonii or dis- 

 color, and a species of Vespertilio, perhaps V. Daubentonii or 

 mystacinus. 



