456 MR. W. A. FORBES ON THE [ May 16, 
liarities. The condition of the male Biziura is nearly identical with 
that found in the females of other Ducks. Very probably it may be 
that characteristic of all the Lrismaturine, of which, however, only 
Erismatura rubida has, so far as I know, been examined as regards 
this point. In that species the syrinx, judging from Macgillivray’s 
Fig. 2. 
Mouth of Baziura lobata. 
description’, is quite similar to that of Biziura, there being no 
tympanum whatever, but simply a long box formed of several rings 
united. 
The examination of these two specimens has revealed a feature in 
them very unexpected in Ducks, and only comparable with that 
found in certain Bustards. This is the possession of a small, but 
distinct, subgular pouch, formed, as in the males of Otis tarda, by 
? Audubon, Orn, Biography, iv. p. 331. 
