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



mile inland among the rocks and bushes. On the east side of 

 Cowley Mountain, Albemarle Island, on August 10 and 11, 

 the tracks of these birds were noted in the dust of the donkey 

 trails at an altitude of about twenty-four hundred feet, and an 

 immature bird was seen. On August 30, at the village of 

 Santo Tomas, Albemarle Island, at an altitude of about 

 twelve hundred feet, a peon brought in an immature one which 

 he had caught early that morning. On other islands they 

 were often found in the brush a short distance from the beach, 

 but never up in the mountains, as on Albemarle. Like the 

 Galapagos Heron, this species proved a very easy one to 

 approach. 



A male, taken on Duncan Island on December 2, and show- 

 ing traces of immaturity, had enlarged testes. Four adults 

 taken on June 25 on Hood Island had small sexual organs, as 

 had an adult male taken at Academy Bay, Indefatigable Island, 

 on July 16. The same remarks also apply to a specimen taken 

 in a cavern gn Abingdon Island on September 22, 1906. 



A nest of this species was found on March 10, on a point 

 thickly clothed with mangroves, which jutted into the large 

 lagoon beside the road leading inland from Villamil. The 

 nest was a bulky affair placed in a low flat bush about two and 

 a half feet above the ground. It was built of twigs and lined 

 with grass, and contained four pale greenish-blue eggs, nearly 

 ready to hatch. On March 15 another nest was found a short 

 distance from the beach about two miles west of Cape Rose, 

 Albemarle Island, and it contained two very small young. 



On July 28, 1905, three Yellow-crowned Night Herons 

 were seen in the brush near Braithwaite Bay, Socorro, Revilla 

 Gigedo Islands, and one was secured. On Cocos Island, 

 Costa Rica, during the first half of September of the same 

 year, they were not infrequent, being seen in the trees and 

 along the fresh-water streams. 



The material from Socorro and Cocos in the Academy's col- 

 lection is very inadequate. An adult male from Socorro and 

 one from Cocos are both slightly paler than adults from the 

 Galapagos Islands. The measurements given in Table IX, p. 

 115, are all from adults, except those of Cocos specimens, in 

 which case an adult male and an immature male were meas- 

 ured. The two Cocos males have larger bills than the Gala- 



