AUSTRALIAN NODDY. 
Anous stolidus rousseaui Hartlaub ; 
Madagascar, Mauritius, Seychelles, etc. ; ? Laccadives. 
Anous stolidus plu 7 nbeigularis Sharpe ; Red Sea. 
Without more material this form cannot be lumped with the preceding ; as 
Sharpe points out, it is easily separable on account of its smaller size. 
Anous stolidus pileatus (Scopoli) ; 
Philippine Islands ; Liu Kiu Islands ; China Sea. 
Without any comparison of the Philippine Island specimens to which Scopoli’s 
name was applicable. Bangs proposed A. pullus for Liu Kiu birds : until such 
are critically compared. Bangs’s name must be cited as a synonym. 
S. philippina Latham and 8. philippensis Bonnaterre are only different names 
for the same bird as that named by Scopoli. 
Anous stolidus unicolor (Nordmann) ; 
Society Island, Paumotu, and other South Pacific groups. 
Of this form A. f rater Coues becomes a synonym ; this is the largest 
form of A. stolidus known to me. 
Anous stolidus gilherti, subsp. n. ; 
West, North and North-east Australia ; Norfolk Island. 
' On account of our ignorance of the plumage changes of this bird not 
much reliance can be placed at the present time upon such differential features 
as “darker,” “ browner,” “ greyer,” or “ whiter ” cap. The Australian bird is 
undoubtedly larger than the Philippine — China Sea — bird, and is also certainly 
smaller than A. s. unicolor. It is of a lighter coloration generally than A. s. 
pileatus when birds in perfect adult breeding-plumage are compared. 
Anous stolidus galapagensis Sharpe ; Galapagos Archipelago. 
This form is, to me, quite distinct in every phase of plumage, its darker 
coloration and its dark grey cap being diagnostic. Rothschild and Hartert 
wrote that they had seen specimens from other parts of the North Pacific 
scarcely separable. Is it that there are two forms inhabiting the Galapagos 
Islands ? A. galapagensis was described from Dalrymple Rock, Chatham 
Island, and a series from Albemarle Island and Chatham Island seem darker 
than these birds from Culpepper Island which may also be larger. Ridgway 
recorded both A. stolidus and A. galapagensis from the Galapagos Islands, but 
at that time certainly did not understand the species, as his A. stolidus t^ame 
from Dalrymple Rock, Chatham Island. It suggests a parallel case to that 
already recorded by me regarding Pu-fflnus Iherininieri at the Galapagos and 
leads to speculation regarding those northernmost islets which, at present, 
I am unable to follow up. 
Anous stolidus ridgwayi Anthony ; Socorro and Tres Maria Islands. 
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