100 CALIFORNIA ACADEMY OF SCIENCES [Proc. 41H Ser. 
eighths beyond the under primary-coverts. No. 956 C. A. S., 
male, June 16, 1906, has numerous grayish white filoplumes 
on the occiput and posterior portion of the crown. A few other 
specimens are similarly, but more sparsely, adorned. A re- 
dundancy of rectrices occurs in Nos. 1003 and 1004 C. A. S., 
the former having thirteen rectrices and the latter fourteen. 
The life colors of the naked parts are described by Mr. 
Gifford as follows: “Bill black; iris dark brown; orbital ring 
black; skin in interramal space flesh-colored; tarsus pinkish 
white ; toes and webs black, basally pinkish white.” 
The Expedition series of one hundred and eighty-one speci- 
mens is distributed as follows: January, nine specimens; 
April, thirty-seven; May, thirty-six; June, forty; July, twelve; 
August, eleven; September, four; October, thirty-two. 
Judging from the specimens at my disposition, the postnup- 
tial moult in the Galapagos birds generally begins in October 
and ends before April. The thirty-seven April specimens (se- 
cured in 1906 on the 23rd and 24th) show signs of abrasion, 
manifesting that destructive changes have begun. May, June, 
and July specimens (procured in 1906) and September ones 
(procured in 1905) display increasing wear. In some May 
individuals considerable renewal is taking place. The thirty- 
two October specimens (all taken on the 14th in 1905) are in 
worn livery. Most of them are beginning to renew the 
feathers of the breast. In many the replacement is also com- 
mencing on the back and in some on the head. The nine 
January birds (all shot before the end of the first week in 
1906) have suffered much from wear and tear. In the ma- 
jority, the innermost primaries are being moulted along with 
the head, neck, and body plumage, indicating a later stage in 
the restoration. In the eleven August specimens (obtained in 
1905 between the Ist and 8th of the month at sea in latitude 
13° and 10° N.) the renewal is more advanced, involving, in 
some cases at least, both primaries and rectrices. As the spec- 
imens taken in the immediate vicinity of the archipelago ex- 
hibit a different cycle in moulting, it may be that these Au- 
gust birds hail from other breeding stations than the Galapa- 
gos Islands. However, the possibility is not lost sight of 
that they may be young of the previous year undergoing 
