EAST AUSTRALIAN WHISKERED TERN. 
Forehead, crown and nape deep black ; all the upper surface, wings and tail light 
grey ; sides of the face and the throat white, gradually deepening into grey on the chest, 
and the grey into black on the abdomen and flanks ; under surface of the shoulder and 
under tail-coverts white ; irides black ; bill blood-red ; feet light blood-red. Total length 
9J inches ; bill If; wing 8f ; tail 3| ; tarsi 
Hab : Rivers and lakes of the interior of New South Wales. 
This form is identifiable at sight by its very light upper-coloration and 
the under coloration is also so much lighter that it becomes white on the throat 
and the white “ moustache ” is undefined. It should be noted that the upper 
coloration of all the forms would appear to be lighter in the winter- than in the 
summer-plumage, while the adult male seems noticeably larger in all its 
measurements than the adult female. At present I would suggest the following 
nomenclature as representing the beginning of the dismemberment of the 
species Hydrodielidon leucopareia : — 
Hydrochelidon leucopareia leucopareia Temminck ; 
South and Central Europe, and North Africa 
may be further separable into other races, for which are available : Sterna 
delamotia VieiUot, Picardy ; Sterna hybrida Pallas, South Volga ; and Hydro- 
chelidon meridioncdis Brehm, Egypt. H. leucogenya Brehm is an absolute 
synonym of H, leucopareia Temminck, Hungary being the type-locality 
of each. 
Hydrochelidon leucopareia indica Stephens ; Northern India. 
As synonyms of this form should be noted. Sterna similis Gray, H. marginata 
Blyth, and S. innotata Beavan. It seems probable that hereafter other races 
wiU be recognised as inhabiting India. 
Hydrochelidon leucopareia leggei Mathews ; Ceylon 
Hydrochelidon leucopareia delalandii Mathews ; South Africa 
Hydrochelidon leucopareia swinhoei Mathews ; China 
with which I would associate, for lack of material, Formosan specimens and 
very doubtfully refer here birds from the Philippine Islands. 
Hydrochelidon leucopareia javanica Horsfield ; Java (winter) ; ? Lower Pegu; 
? Tenasserim (breeding) ; ? Togian Islands (winter). 
This incongruous mixture results from study of birds without knowledge of 
their movements ; it is quite possible that two or three races are here 
represented, but nothing definite can be stated. 
Hydrochelidon leucopareia fluviatilis Gould ; East and South Australia. 
Hydrochelidon leucopareia rogersi Mathews ; 
North and North-west Australia. 
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