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



saw on two occasions a large white booby, which we took to 

 be this species. The day after leaving Culpepper Island, Sep- 

 tember 26, 1906, we saw one in latitude 3° 29' North, longi- 

 tude 93° 6' West; while on October 13, 1906, a nearly adult 

 bird was taken in latitude 15° 36' North, longitude 110° 12' 

 West. Mr. Beck records two .at Clipperton Island, Mexico, 

 and two at Cocos Island, Costa Rica.^ 



The breeding-places and breeding-dates for this species in 

 the Galapagos Islands, so far as known are as follows: Cul- 

 pepper in July and December ; Daphne in November ; Enderby 

 in May; Gardner-near-Charles in October; Hood in February, 

 May, and October; Wenman in February and December. 



The nest was a mere depression in the soil, usually sur- 

 rounded with pebbles and bits of rock, and invariably situated 

 close to the sea, often on the edge of some precipice or on a 

 ledge of a cliff. A sitting bird was frequently seen picking up 

 bits of rock with its bill and placing them around the nest. 

 When both male and female were at a nest they had the 

 habit of touching bills. 



Whenever a bird was driven from a nest, it left with great 

 reluctance, and usually returned in a minute or two with much 

 squawking, and fondly covered its charge. When the mate 

 arrived to relieve the nest bird, there was also a great deal of 

 squawking. One day I was sitting in front of a nest when 

 the second owner arrived. The nest bird immediately drew 

 its attention to me, and apparently tried to induce it to join in 

 an attack on me. 



The first place in which we encountered Peruvian Boobies 

 breeding, was the larger Daphne Island, where they were' 

 nesting on the steep seaward slopes and on the rim of the 

 crater, but not within the crater itself, which was occupied by 

 Blue-footed Boobies. On November 23 some had eggs, and 

 others had young. 



They were nesting abundantly on Hood Island in early 

 February. On February 1st some birds were seen with fresh 

 eggs, some with one egg and one young, others with two very 

 young ones, and others still with one young one only. All of 

 the young were either naked or in the down. The adults seem, 

 however, to rear only one young one, for I have never seen 



^Condor, v. 9, p. 110. 



