84 



CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



In fact the whole plumage of the under parts is softer than 

 that of adult birds. 



MEASUREMENTS (in millimeters) 



The three sets of eggs taken by the Expedition measure in 

 millimeters as follows: 64X39, 66X40.5, 69X41; 59.5X 

 40.5, 63X44, 65X44; 69X42, 70X42. 



Sula cyanops: Blue-faced Booby 



The Blue-faced Booby is one of the common boobies of the 

 eastern tropical Pacific north of the Galapagos Islands. The 

 Academy's expedition first encountered it on July 23, 1905, 

 in latitude 20° 59' North, longitude 111° 57' West. The last 

 one noted on the southward voyage was seen on August 18 in 

 latitude 7° 24' North, longitude 103° 52' West. During a stiff 

 blow off Clipperton Island, Mexico, I noted an immature one 

 on the water exhausted. 



