542 Mr. O. Thomas on new 
of the tooth-row from the front of the canine to the back of 
m.°, but in M. simus this breadth decidedly exceeds the same 
longitudinal dimension. Distinct sagittal and lambdoidal 
crests present. 
Upper incisors of about equal length; the inner triangular 
in section, with one longer anterior and two shorter posterior 
cusps ; outer incisor with its slanting postero-external face 
surrounded by five or six crenulations or minute cusps, but 
how far these are the result of wear I am unable to say. 
Small upper premolars drawn inwards from the tooth-row, 
the second, minute, one entirely hidden behind the anterior 
end of the large premolar. Middle lower premolar about two 
thirds the height of the anterior one, which in turn is about 
two thirds the height of the posterior. 
Dimensions of the ty pe (measured on the spirit-specimen) :— 
Forearm 36:5 millim. 
Head and body 46; tail 83; head 15°7; ear 12°5; tragus 
on inner edge 4°5; third finger, metacarpal 33, first phalanx 
10, second phalanx 11; lower leg 14°5. 
Skull: occipito-nasal length in middle line 11:9; basi- 
palatal length 10°3; interorbital breadth 4; mastoid breadth 
7°53 palate length 5:4. 
Hab, Sarayacu, Peru. 
Type. Female (in spirit), B.M. no. 81. 5.12.2. Col- 
lected in 1876 by Mr. W. Davis and presented by Messrs. 
Veitch. 
The short hair and comparatively stumpy build of this bat 
give it so different an appearance to the other members of 
Myotis that no one at first sight would suppose it to belong 
to that genus; but the detailed structure of the ears and the 
characters of the teeth are typically those of J/yotis and 
there is no reason to distinguish it generically from that 
roup. 
No described species of the genus appears to have any 
resemblance to it. 
Artibeus Watsoni, sp. n. 
Size about as in A. cznereus, dentition as in A. glaucus. 
Nose-leaf similar to that of A. glaucus, but apparently 
rather narrower. Ears higher and narrower than in that 
species ; inner margin evenly convex, tip narrowly rounded ; 
outer margin deeply concave in its upper half, then convex, 
ending below in a slightly angular antitragal lobe. Tragus 
more sharply pointed than in A. glaucus, and the projections 
on the outer margin more prominent. 
Fur close and fine, extending on the proximal half of the 
