MONOGRAPH OF THE PETRELS. 



showed that the female was slightly larger than the male, and he gives the dimensions 

 as follows : — 



3 Wing, 5.8-6.6 inches ; tail, 2.85-3.1 ; tarsus, 1.67-1.75. 



? Wing, 5.8-6.6 inches ; tail, 3.1-3.2 ; tarsus, 1.75-1.8. 



I have not found any great difference in the size of the sexes, my measurements, 

 taken from specimens in the British Museum, being as follows : — 



3 Wing, 6.15-6.8 inches; culmen, 0.65-0.7; tail, 2.75; tarsus, 1.65-1.75; middle 

 toe and claw, 1.4-1.45. 



$ Wing, 6.3-6.5 inches ; culmen, 0.7 ; tarsus, 1.75-1.8 ; middle toe and claw, 

 1.35-1.4. 



The male and female described above are from the series from Great Salvage 

 Island ; the young birds are from Western Australia, all being in the British Museum. 

 The specimen figured is in our collection, and is said to be from New Zealand. 



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