The Bats of British Guiana. 97 
the whole therefore one must conclude that the settle- 
ments together consisted of a very large number of indi- 
viduals, in which the males of each species were by no 
means so sparsely represented as is generally considered 
to be the case among bats. 
In this preliminary paper, I have to record the occur- 
rence of 15 species, this being the result of individual 
observation, though it is certain that many others are yet 
to be obtained. They include the following : — 
1 . Vampyrus speclrum. 
2. Car Ilia brevicaudatus. 
3. Macrophyllum neuwiedii. 
4. Phyllostotna sp. 
5. Glossophaga soricina. 
6. Artibeus planirostris. 
7. ,, bilobatus. 
8. Desmodus rufus (?). 
9. Molossus sp. 
10. Molossus obscurus. 
1 1 . Noclilio leporinus 
12. Rhynchonycleris naso. 
13. Atalapha noveboracensis, 
14- » ega. 
15. Thyroptera tricolor. 
Of these, the eight first are members of the family 
Phyllostomatidx, and are characterised by the peculiar 
" Nose-leaf" processes which are absent from the 
other species; the next four belong to the Embal- 
lonuridde, distinguished by having tails either shor- 
ter, or much longer than, the membrane stretching 
between the hind limbs (interfemoral) ; while the last 
three are Vespertilionidse^ in which the tails are long, 
