In coloration Adelonycteris gaumeri resembles examples of A. fusca in immature dark pelage, but it differs from this species in the thinness of the ears, and in the greater relative length of the narrower and more tapering tragus, and in its very much smaller size. In size it resembles both ‘Vesperugo’ propinquus Peters and V. (Marsipolæmus) albigularis Peters, respectively from Guatemala and Mexico. The peculiar structure of the ears, to say nothing of the coloration, in V. albigularis, render comparison with this species unnecessary. V. propinquus is described as reddish above, paler and more reddish yellow below, and in this respect is widely different from A. gaumeri. It has also a longer thumb and foot than A. gaumeri.
The type and only specimen of this species has been kindly presented by Dr. Gaumer to this Museum, with other specimens of Yucatan mammals.
FOOTNOTES
[1] Collector’s measurements from the fresh specimen; the rest are from the dry skin.