18 ARKIV FÖR ZOOLOGI. BAND 13. N:0 4. 



Fam. Ibidae. 

 11. Guara alba (Linné). 



Eudocimus alhus Thayer and Bångs, Bull. Mus. Comp. Zoöl. XLVI, 1905, 

 144 (San Miguel; Pacheca). 



BovALLius' CoUection: 1 ?, Viveros, April 6 (1 skull, 

 also Vi ver os, no date). 



The White Ibis was observed in the channel between 

 Viveros and San Miguel. 



A specimen was shot high on Pedro Gonzalez in 

 the dense for est. 



On Punta Cocos it was very common at low tide. 



There are in the literature very vague statements about 

 the breeding of the White Ibis in Central America. Salvin 

 and Godman say (Biol. Centr.-Am. Aves III, 1901, 192), «It 

 is probable, that the White Ibis is chiefly, if not entirely, a 

 winter visitor to the whole of Central America, as it is to Bra- 

 zil and other parts of South America». 



Dr. BovALLius unfortunately makes no statement as to 

 whether he found this bird breeding in the Pearl Islands or 

 not, but Thayer and Bångs record, that an egg ready to be 

 laid was taken from the oviduct of a bird killed April 14 in 

 Pacheca Island. This circumstance favours the belief, that 

 the White Ibis breeds in the Archipelago. 

 * The measurements of the present specimen are as f oUows : 

 wing 264; tail 99; culmen 118; tarsus 79 mm. 



Fam. Anseridae. 



Dr. BovALLius says, that a fresh-water lagoon at Punta 

 Cocos was a favourite hold for ducks of various species. 

 Unfortunately he brought no skins of these birds, but of 

 course it deals with wintering birds. 



Fam. Cathartidae. 

 12. Catharista urubu (Vieillot). 



Caiharista urubu Thayer and Bångs, Bull. Mus. Comp. Zoöl. XLVI, 1905, 

 144 (Saboga). 



Half a score of Black Vultures was observed in Bay- 

 o n e t a, when the birds from an isolated rock were watching 



