RUDDY TROPIC BIRD. 
The West Australian and Christmas Island (Indian Ocean) birds have 
rather shorter bills though longer wings, while the coloration separates them 
from the Kermadec birds, which are still larger. 
Society Island birds differ in coloration from those of the Kermadecs, 
while from Rothschild’s own data it is obvious that Laysan birds differ very 
appreciably in size and coloration from those of the Kermadecs and cannot 
be called P. r. mhricauda^ but are nameless. 
Bonin Island birds have a very short biU, 56 to 59 mm. ; the plumage 
is whiter than Kermadec Island birds. 
I therefore would recognise 
Sc.®OPH^THON RUBRICAUDA RUBRICATJDA Boddaert. 
Mauritius ; Assumption Island. 
Sc.a:OPHJETHON RUBRICATJDA WESTRALIS MatheWS. 
Rottnest Island, West Australia ; 
Christmas Island, Indian Ocean. 
With a rosier coloration than the preceding ; the biU rather smaller and the 
wing longer. 
Sc^OPHiETHON RUBRICAUDA NOV.®HOLLANDIjE Brandt. 
Kermadec Islands ; Norfolk Island ; 
Lord Howe’s Island ; Raine Island ; 
Torres Straits. 
With a deep rose coloration which separates this form at sight : the bill 
agreeing closely with that of the typical subspecies in size, but the wing 
noticeably longer. 
P. T. eruhescens Rothschild is a synonym. 
Sc.aSOPH^THON RUBRICAUDA MELANORHYNCHUS Gmelin. 
Turtle and Palmerston Islands, Pacific 
Ocean ; Society Islands. 
This subspecies cannot yet be accurately defined, no topotypical examples 
being available ; the specimens from the Society Islands, the nearest locality, 
agree in size with the preceding subspecies, but differ at sight in lacking the 
deep rose coloration. 
SC^OPH^THON RUBRICAUDA ROTHSCHILDI, Subsp. nOV. 
Laysan ; Niihau. 
Separated by its weaker bill and shorter wing from the Kermadec form, from 
which it differs also in coloration, as indicated by Rothschild and quoted above. 
Sc.aJOPH^THON RUBRICAUDA BREVIROSTRIS, Subsp. n. 
Bonin Islands. Separated by its small bill which measures 56 to 59 mm. 
Collected lOth May, 1911. The eggs are also smaller, 59-62.5 by 43-44. 
August 1910. 
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