54 On Birds observed at the Salvage Islands. 



0. leucorrlioa has the tail deeply forked, the outer feathers 

 being much longer than the middle pair and dark to the 

 base^ while the upper tail-coverts are uniform white, not 

 tipped with black. 



O. cryptoleucura has the tail nearly square, the outer 

 feathers being only slightly longer than the middle pair, the 

 basal part of tlie outer feathers is white, and the upper tail- 

 coverts are white, tipped with black. 



According to our Lanzarote pilot, this species breeds com- 

 monly on the Little Piton, and it was with great regret that 

 we had to leave the Salvages without visiting this little island. 

 In propitious weather it is just possible to effect a landing 

 on its dangerous rocks, and it was only the fear of missing 

 our steamer at Las Palmas that prevented our making the 

 attempt, for on our second visit to the Great Piton our 

 pilot told us the sea and wind were fairly favourable. 



Since our return to England we have obtained, through 

 Padre Ernesto Schmitz, several additional examples of this 

 species from Madeira, the Lime Island, Porto Santo, and the 

 Desertas Islands, and of these I add the following measure- 

 ments : — 



Four males. Wing 5'6-5'95 inches, tail 2'8-2"9, tarsus 

 0'81-0-9. 



Three females. Wing 5'85-6'2 inches, tail 2*8-2'9, tarsus 

 0-85-0-95. 



The male is distinctly rather a smaller bird than the 

 female ; the average male wing is 5 '8, that of the female 

 5'98 inches. 



The only egg we obtained measures 1*3 by 0"96 inch. It 

 is exactly like the egg of Leach's Petrel, white, with an in- 

 distinct zone of light red^ and faint purplish underlying dots 

 round the larger end. 



-f 21. BULWERIA BULWERI. 



The brownish-black Bulwer's Petrel was the only other 

 species met with on Great Salvage. It is a common bird in 

 the Madeira and Canary Seas. We were too early for its 

 eggs, but obtained four taken at the Lime Island, Porto Santo, 



