64 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



series and from the remarks by Mr. Ridgway/ it would appear 

 that the extreme pale phase of this species is known only from 

 Chatham, Indefatigable, and Albemarle Islands. In the ex- 

 treme pale examples, the under tail-coverts are white or very 

 pale gray with subterminal black spots, and there is a more or 

 less distinct grayish-white postocular streak. The pileum and 

 occipital crest are of the same color as in the dark phase, while 

 the throat is white instead of gray. In many of the specimens 

 of the dark phase the chin and throat have absolutely no white, 

 but are pale gray mottled with darker gray. Breeding indi- 

 viduals of the pale phase seen at Sappho Cove in February 

 had noticeably red tarsi and toes. 



The series of young and immature birds shows considerable 

 variation also. In the majority of cases the ventral aspect is 

 dusky as described by Mr. Ridgway. Two specimens, how- 

 ever, from Cowley Bay, Albemarle Island, and from Nar- 

 borough respectively, are noticeably white below. Some speci- 

 mens have the terminal triangular white spot on the four outer- 

 most primaries as well as on the others. In very dusky ex- 

 amples the rusty shaft-streaks are lacking in the feathers of 

 the pileum and occipital crest. In some specimens the back 

 and scapulars are not of uniform deep sooty brown, but have 

 broad cinnamon-rufous mesial stripes, and the wing coverts 

 are similarly marked. No. 2144, Jervis, December 18, is an 

 excellent example. No. 2152, Indefatigable, July 23, has 

 narrow pale mesial stripes. No. 2148, Indefatigable, January 

 22, in which the juvenal plumage is not yet fully developed, 

 shows beautiful green reflections on the feathers of the upper 

 parts. 



Two adults showing albinistic feathers were taken on In- 

 defatigable Island in latter November. One had a white 

 feather in the side of the neck, the other a white secondary. 

 No. 2119, adult male, from south Albemarle, has the tertia- 

 ries a dark shining green, like the end of the tail, for about one 

 quarter-inch at the distal end. This color is in the form of a 

 terminal band. A similar terminal band, much interrupted, 

 is formed by this color on the tail. 



The Academy's series of skins of this species numbers 102. 

 Forty-five adult males show the dimensions, in millimeters, 



iProc. U. S. N. M., V. 19, p. 60S. 



