Vol. II, Pt. I] GIFFORD— BIRDS OF THE GALAPAGOS ISLANDS 65 



of that sex to be: Wing 176-198 (186) ; tail 57-71 (63) ; 

 culmen 62-71 (67.3) ; tarsus 44.3-52.3 (48.6) ; middle toe 

 42.9-49 (45.6). Thirty-six females yield the following meas- 

 urements: Wing 169-192 (183); tail 56-70 (63.8); cul- 

 men 58.1-69.2 (65.4); tarsus 43.4-51.2 (47.4); middle toe 

 39.3-46.5 (44). 



Table X, p. 116, giving measurements of specimens by 

 islands, shows that there is no variation in size with locality, 

 but that obviously all the variation in size is individual. It 

 cannot be correlated in any way with the color phases. 



Birds in juvenal plumage showing no signs of moult were 

 taken during nine months of the year, and consequently prove 

 to a certain degree the wide range of the breeding-season of 

 this heron. They were taken as follows : November 25, 

 Indefatigable; December 18, Jervis; January 22, Indefati- 

 gable; March 24, Albemarle; April 18, Narborough; May 23, 

 Charles; June 28, Hood; July 14 and 23, Indefatigable; Sep- 

 tember 22, Abingdon. 



Birds in juvenal plumage with the renewal taking place 

 chiefly in the scapular and interscapular regions were taken 

 as follows: September 27, 1905, Gardner-near-Hood ; Octo- 

 ber 24, Barrington ; November 8, Indefatigable ; November 

 22, Seymour; January 5, James; July 16, Indefatigable; 

 August 11, Albemarle; September 22, 1906, Abingdon. No. 

 2163, Indefatigable, January 11, is somewhat farther along 

 than the above specimens, and has a good many new gray 

 feathers in the lower parts. No renewal seems to have yet 

 taken place on the wings, the feathers being those assumed 

 with the juvenal plumage. 



A study of the Academy's series of adults reveals the two 

 following points : The immature birds assume the adult 

 plumage at the first prenuptial moult, which evidently involves 

 the wings and tail as "well as the body. The adults also have 

 a complete prenuptial moult. 



Butorides virescens: Green Heron 



The Green Heron was not an uncommon bird on Cocos 

 Island, Costa Rica, where a number were seen in the tall for- 

 est trees and along the streams in September, 1905. 



August 8, 1913 



