160 M.L. H. Jeitteles on Amblyotus atratus, Kolenatt. 
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, Blas., 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. 
Blas., and likewise from those of the genus Vespectilie, 
Linn. 
The generic character of Amblyotus, 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. Se oye 
ane species Amblyotus atratus, Kolen., may be thus charac- 
terized :-— aly 
‘ars 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 sheen 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. 
