3/0 Loomis, The Galapagos Albatross. [July 



immaculate;. . wing about 380 mm." The color of the facial 

 disks is not mentioned. Knight in his 'Birds of Maine,' prefers 

 to treat such birds as " extremely pale or faded individuals of the 

 Typical Horned Owl," considering the species non-migratory. 

 This course, however, seems hardly justifiable, and to my mind 

 the present additional records of birds identical respectively with 

 the Labrador and the northwest Canadian forms seem sufficient 

 proof that they have come as occasional migrants from these 

 precarious portions of the species' range, driven from their usual 

 year-round haunts by some causes which we have not yet wholly 

 fathomed; but no doubt chiefly through failure of the food supply 

 in their home regions. These constitute the first definite record 

 for Massachusetts of the Labrador Horned Owl, and the second 

 and third records for the Arctic Horned Owl in the same state. 



VARIATION IN THE GALAPAGOS ALBATROSS. 



BY LEVERETT MILLS LOOMIS. 



Plates XIV-XW 



For an albatross, the Galapagos Albatross (Diomi'dea irrorata) 

 has a peculiar distribution. It breeds in the Southern Hemisphere 

 within less than two degrees of the equator and, so far as known, 

 only on Hood Island of the Galapagos Archipelago. After repro- 

 duction it apparently migrates southward, as far at least as the 

 coast of Peru. 



The island isolation of this bird during its breeding season and 

 its large size render it an attractive subject for a study of variation. 

 The most striking differences occur in the coloration of the downy 

 young and in the form of the bill in sexually mature individuals 

 taken at their rookery. 



1 I ani under obligations to Mr. Charles B. Barrett and Mr. L. R. Reynolds for the 

 photographs reproduced in these plates. Mr. Reynolds photographed the downy young 

 and the bills showing side aspect and Mr. Barrett enlarged the latter to natural size and 

 photographed the other bills. 



