456 



MR. W. A. FORBES ON THE 



[\ray 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 Erisinaturinee, 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 lohata. 



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, subgidar pouch, formed, as in the males of Otis tarda, by 



' Audubon, Orn. Biographj-, ir. p. 331. 



