98 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



mon, especially toward evening, when they passed in flocks 

 of ten or more. One came aboard the schooner after dark 

 and was captured. At San Benedicto they were fairly com- 

 mon. Two nests were found ; on one a male was brooding a 

 young bird ; on the other a female was brooding two eggs. 



A number of Brewster's Boobies were observed daily on the 

 voyage from San Benedicto to Clipperton Island. There ap- 

 peared to be no decrease in numbers to indicate where the 

 birds from one colony ended and those from the other began. 

 In the vicinity of Clipperton Island they were observed in 

 mixed flocks of birds, consisting of such species as the Dark- 

 rumped Petrel, Wedge-tailed Shearwater (PuMnus chloro- 

 rhynchus), Noddy, Clipperton Noddy, Blue- faced Booby, and 

 Sooty Tern. On a squally day I noted an adult male dead 

 on the water, evidently struck down by a wave. 



At Clipperton Island Brewster's Boobies were nesting 

 abundantly all around the island, here and there interspersed 

 with colonies of Blue-faced Boobies, which, however, were 

 not nesting. Of the Brewster's Boobies, some had eggs and 

 others naked young. The nests were mere depressions lined 

 with wing-quills. 



The first birds of the Cocos Island colony were seen on 

 September 1st, when some thirty or forty miles south of that 

 island. On the 2nd they were fairly common ; in the morning 

 they were noted flying away from the island, and in the 

 evening towards it. In this region their headquarters were on 

 a small island oflfshore, situated between the small outlying 

 islands of Nuez and Cascara. Only two or three individuals 

 were observed on the main island. On September 13 we 

 found them nesting abundantly, little hollows in the soil 

 amongst the rocks and grass on the steep slopes of the island 

 being utilized for nesting-sites. Naked and downy young 

 and eggs, sometimes one, sometimes two, were found. 



On the voyage home from the Galapagos Islands in 1906, 

 from one to three birds were seen on October 4, 5, 7, 8, 10, and 

 13. On October 4 the "Academy" was in latitude 14° 24' North, 

 longitude 107° 5' West; on October 13 in latitude 15° 36' 

 North, longitude 110° 12' West. One bird taken had a num- 

 ber of ticks attached to its gular sac. 



