ia. PROCEEDINGS OF THE NATIONAL MUSEUM. 439 
The second specimen was larger than the first, and measured (the limbs 
being displayed), from crown to rump, 24 millimeters; length of head, 
17 millimeters; foot, 9; thumb, 7. The tragus was erect and the pecu- 
liarities of the adult structures were beginning to announce them- 
selves, though no hairs were present. 
If the results obtained from the examination of the embryos be con- 
firmed, Natalus presents a disposition for the integument at the muzzle 
to take on a different expression in the late form of the embryo or in 
the recently born, which is not found in an earlier stages of develop- 
ment or in the adult. Such a disposition is, so far as I know, unique, 
and it may be a temperate deduction to make that Natalus at no time 
bears a nose-leaf, but that the parts as seen in Fig. 1 in the late em- 
bryo are effects of shrinkage of the tissues under alcohol. Yet since N. 
micropus possesses an elevation at the top of the muzzle which is much 
the same in character as the form of N. stramineus, I have concluded 
to name the parts as they stand in the above diagnosis. 
Ihave had an opportunity of examining both Natalus stramineus and 
Natalus micropus. 
