10 
head, broadest near the base. Nostrils small, oval. Lamelle continued 
to the margin of the bill. Tongue vather obtuse, with an appendage 
at the tip. 
Anas. Linn. 
Mareca. Steph. 
Tyrer. Mareca fistularis. 
Afinity. To the next genus this presents an approach in the 
formation of the tail, which in some of the species is pointed and 
slightly elongated. To the following the form of the bill presents 
an affinity. 
GENUS VIII. AIX. 
Ext. Car. Pedes digitis posterioribus non lobatis, mediis longis- 
simis.  Tibie plumate. Rostrum brevius capite, baso ad apicem 
angustatum. Lamelle abbreviate. Nures subovales, parve. Cauda 
mediocris. 
Ext. Cuar. Feet with the posterior toes not lobated, the middle 
ones longest. Thighs feathered. Bill shorter than the head, nar- 
rowed from the base to the point. Lamelle abbreviated.  Nostrils 
-suboval, small. TZail moderate. 
Anas. Linn. 
Arx. Boie. | 
QUERQUEDULA. Briss., Steph. 
DENDRONESSA. Swain. 
Type. Aix sponsa. 
Its habit of sitting and making its nest in trees is curious. 
Affinity. Certainly more nearly allied to Querquedula and Mareca 
than any other genus of this sub-family. 
GENUS IX. QUERQUEDULA. 
Ext. Cuan. Pedes digitis posterioribus non lobatis. ‘Rostrum 
lateribus parallelibus. Lamelle paululum elongate. Nuaresrotundatze 
mediocres. Cauda brevis. Lingua subobtusa, ad apicem appen- 
diculata una ordine setarum brevium, ad apicem aliquando pene 
obliterate, supra he set, in medio, lateraliter, Septem spinis instructa. 
Ext. Cuar. Feet with the posterior toes moderate, and not 
lobated. Bill with the sides equal. Lamelle slightly elongated. 
Nostrils rounded, moderate. Tail short. Tongue rather obtuse, with 
an appendage at the tip; the sides armed with one rank of short 
bristles towards the apex, very short; above these bristles, in the 
middle, on each side, armed with seven spines, 
