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



41 



fruitless as far as finding another case of double down was 

 concerned; nor did the examination of the downy young of 

 other Lariformes (Hydrochelidon nigra, Sterna forsteri, 

 Sterna antillaruni, Sterna fuliginosa, and Anous stolidus) 

 develop another instance. Dr. Dwight makes no mention of 

 such a condition in any of the Lariformes examined by him 

 in the preparation of his paper on The Sequence of Moults 

 and Plumages of the Laridce {Gidls and Terns)} 



In the following table are given measurements of eleven 

 young gulls (in downy and juvenal plumages) taken from 

 the colony on southeastern Hood during the first week of 

 February, 1906. 



The colors of the naked parts of the adults in life were as 

 follows : Bill black, tip gray pea-green ; rictus crimson ; skin 

 in interramal space salmon-colored; orbital ring crimson; iris 

 dark brown ; tarsus and toes peach-blossom pink ; webs gerani- 

 um pink shaded with black at edges. 



Forty-three adult males measure in millimeters as follows : 

 Wing 410-442 (424); tail 181-216 (196); culmen 50-55.5 

 (52.8); tarsus 45-56.5 (50.2); middle toe 44-51.3 (47.5). 



Forty-seven adult females measure in millimeters as fol- 

 lows : Wing 406-432 (417); tail 181-210 (192); culmen 

 48.4-53.9 (51) ; tarsus 44.3-51.9 (48.1) ; middle toe 43-49.4 

 (45.8). 



Five males in the flesh yielded the following measurements 

 in millimeters: Lengths 571, 580, 590, 591, 606; extents 

 1362, 1375, 1382, 1390, 1392. Three females gave the fol- 

 lowing results: Lengths 550, 560, 573; extents 1241, 1318, 

 1330. 



^Auk, V. 18, pp. 49-63. 



