‘ 
41 
From Mr. Eyton’s observations (Monogr. Anatidee, p. 79) it is evi- 
dent that the ¢rachea of the female Plectropterus is, as is generally 
the case in this sex, destitute of the bulba ossea. 
Fig. 2. 
Fig. 3. Fig. 4. 
I have already pointed out the external characters by which the 
two Spur-winged Geese may be distinguished, and their synonymy 
will now stand somewhat as follows :— 
1. PLECTROPTERUS GAMBENSIS. 
Anas gambensis, Linn.—A. spinosa, Vieill. ; Lath. Gen. Syn. iii. 
pt. 2, p. 452, pl. 102; G. H. x. 241. — Anser gambensis, Benn. 
