57 [Vol. xxxiii. 



and (3) caves situated in the outer walls of the largest 

 crater, 600 ft. above the sea and f mile from the water's 

 edge. A detailed account of these various nesting-sites will 

 appear in the January number of the 'Ibis/ 



" The Yellow-billed Shearwater was likewise the only 

 species found on the West Rock, which is merely a mass 

 of lava rising some 30 ft. above the sea-level, and not more 

 than 40,000 square yards in area. 



"On the next island visited, Montana Clara, matters 

 improved considerably. This is a smaller island than 

 Graciosa, being 1|- miles long by f mile broad, and really 

 consists of a single large crater rising to an elevation of 

 700 feet. 



"Puffimis kuhli flavirostris swarmed over the entire island, 

 and when I arrived on the 7th of June all the birds were 

 sitting on eggs. The sex of this Shearwater can be told 

 without dissection by the size of the bill and feet, which are 

 very considerably heavier in the male bird. The marked 

 difference in size between the sexes has already been pointed 

 out by Mr. Ogilvie-Grant in his paper on the birds of the 

 Salvage Islands (cf. ' Ibis/ 1896, pp. 47-50). 



" The second species, which was also numerous, was 

 Bulwer's Petrel, Buhveria bulweri. The birds were nesting 

 under the fallen boulders at the foot of the cliffs and 

 along the shore. Occasionally I found them nesting in 

 holes in the side of the crumbling cliff. They all had eggs 

 on the 7th of June. 



u The third species which was found breeding on this small 

 island was the much-discnssed Puffinus assimilis baroli. A 

 very small colony existed in a most inaccessible part of tiie 

 island. They had chosen the basin of the crater, one side 

 of which was open to the sea, and their eggs were laid under 

 huge lumps of lava. Nestlings in all stages of plumage 

 were obtained, and are exhibited together with the only two 

 eggs discovered. It will be seen that these eggs were found 

 on the 8th of June, while the latest date upon which 

 Mr. Meade- Waldo took young birds in Tenerife was the 

 26th of April, which shows a very great discrepancy between 



