11 , 
Anas. Linn. 
QUERQUEDULA. Ray, Briss. 
Type. Querquedula erecca. 
Affinity. More closely allied to the genera Marecaand Aix than 
any other in the sub-family. 
GENUS X. PETROCYANEA. 
Ext. Cuar. Pedes digitis posterioribus mediocribus, et non 
lobatis. Rostrum latiusad apicem quamadbasin. Lamelle paululum 
elongate. Nares rotundate, magne. Cauda vix elongata. Ala@_ 
_ ptilis ceruleis. 
sty 
Ext. Cuar. Feet with the posterior toes moderate, and not 
lobated. Bill broader at the tip than at the base. Lamelle a little 
elongated. Nostrils rounded, large. Tail a little elongated. 
PETROCYANEA. Son. 
Anas. Linn. 
QUERQUEDULA. Briss. 
_-~ CYANOPTERUS nobis. ~~* 
Tyrer. Petrocyanea Rafflesii. 
The above genus consists of that group commonly called the blue- 
winged teal; nor do we know one instance of a bird agreeing with 
the character which has not bright azure-blue wings, except the 
Garganey, which has, however, dull slate-coloured ones. Anas 
. Rafflesii, King, may be considered as a good specimen of the form, 
which may be always distinguished by the peculiar abrupt termination 
to the upper mandible, which is bent, as it were, over the lower one, 
both in front and on the sides of the apex. The Garganey comes 
nearer to the common teal than the rest of the genus in external 
- form, but in the form of the trachea differs from it. We have never 
observed a skeleton in any collection except that of the Garganey, 
which we do not consider typical. 
Affinities. In the form of the bill and trachea this genus 
approaches that of Chauliodus, but differs from it in the former, not 
having the lamelle so much elongated, and in the trachea being more 
enlarged above the inferior larynx. From the following genus it is 
very distinct in both particulars, but agrees with it in general colouring. 
GENUS XI. SPATULA. 
Ext. Cuar. Pedes digitis posterioribus parvis, et non lobatis. 
Tibia parte quarta denudate. Rostrum longum, ad apicem multum 
