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



85 



At San Benedicto, Revilla Gigedo Islands, the species was 

 common and nesting on July 26, 1905, eggs and naked young 

 being seen. At Clipperton Island on August 10, there were 

 large colonies scattered about among the Brewster's Boobies, 

 but none were nesting. 



On the northward voyage the species was first noted on 

 September 29, 1906, in latitude 9° 22' North, longitude 98° 25' 

 West, when half a dozen immature birds with brown heads 

 were seen singly during the day. Individuals of this species, 

 usually immature, were seen almost daily until October 25, 

 latitude 19° 53' North, longitude 118° 1' West. 



Life-colors of naked parts of brown-headed immature birds 

 are: Bill olive-bufT; gular sac and face dark plumbeous with 

 light spot under eye; feet cinereous with toes olive-buff on 

 under side. 



Life-colors of naked parts of adults: Bill straw-yellow; 

 gular sac and face bluish black with light spot under eye ; feet 

 lavender, toes edged with olive-buff. 



In the following table are the measurements of thirteen 

 adults taken by the Expedition. 



MEASUREMENTS (in millimeters) 



Sula piscatrix: Red-footed Booby 



Plate V, Fig. 1 



Abingdon, Bindloe, Culpepper, Gardner-near-Charles, 

 Hood, Indefatigable, Tower, and Wenman islands. 



