Vol. II, Pt. I] GIFFORD— BIRDS OF THE GALAPAGOS ISLANDS 11 



scapulars, and wing-coverts has been largely replaced by very 

 light gray, while the brown of those feathers is but very little 

 lighter in color than normal. The four outermost primaries 

 of each wing are worn, and are those of the normal immature 

 plumage ; while the remaining primaries are fresh feathers of a 

 very pale gray color with darker tips. The tail and tail-coverts 

 are also of an abnormal light gray, and there is a mottled ap- 

 pearance on the breast, due to the partial exposure of the pale 

 bases of the feathers. The iridescent patches on the sides of 

 the neck show feathers subterminally white. The head, how- 

 ever, is normal. Some albinistic specimens have all of the 

 primaries pale gray with darker tips ; others are variously, but 

 less conspicuously, marked. The one showing the least 

 abnormal coloration is a bird with several pure-white downy 

 feathers in the abdominal region, completely hidden by the 

 contour feathers. It is perhaps significant that all of the 

 albinistic birds taken are adult, or are moulting into the adult 

 plumage, the albinistic feathers being of that plumage. No 

 albinistic young were found. 



The Academy's series of skins of this species numbers 226, 

 ninety-three of which are adult males, and eighty-one adult 

 females. The extreme and average measurements of these in 

 millimeters are as follows: Males — Wing 118-143 (132); 

 tail 63-82 (73); culmen 16-19.5 (17.7); tarsus 22-27.3 

 (24.5) ; middle toe 20-25 (23.2). Females— Wing 114-131 

 (121); tail 55-73 (64); culmen 14.6-18.2 (16.3); tarsus 

 19.8-24.7 (22) ; middle toe 18.3-22 (20.5). 



Table I, p. Ill, shows the measurements of adults by islands. 

 It will be noted that birds from Wenman and Culpepper 

 islands are the largest, a fact noticeable in life. The males 

 from Jervis Island are the longest-billed, and the females from 

 Jervis are, in this regard, second only to females from Cul- 

 pepper. The sexes are usually recognizable in life, males be- 

 ing decidedly the larger. 



The four eggs of this dove possessed by the Academy are 

 pure white in color and elliptical-oval in shape. The egg from 

 Narborough Island measures in millimeters 26.4X20.4. The 

 three from Wenman Island measure respectively 27X20.2, 

 26X19.7, and 26.3X19.6, the last two being from the same 

 nest. 



