1919] Birds of the Canary Islands. 467 



Tenerife, 



" V'ery coininon, .above all in the neiglibourhood of the barr.incos on 

 the coast. They were met with on both occasions on which the 

 Peak was ascended .... Hying- around the crater of the Piton. 



The hot sulphur vapours did not appear to worry them 



The Black Swifts nest in the caves, and in the crevices of the 



I'i'cks The sites chosen by this bird are almost always 



inaccessible. In the Barianco de Martianez several of these 

 Swifts have built their nests in the fissures of rock. In the first 

 week of May one heal'd the little ones chirping." (Webb & 

 Berthelot, Orn. Canarienne, p. 24.) 



" It appears in large numbers. On the 26tu of February [BoUe does 

 not mention the year, but he is writing in 1857] I saw several 

 over Santa Cruz, some were there almost the whole spring. 



More were seen on the 10th of March In Tenerife they 



disappear all at once in September (I think that they go to 

 their relatives in the Cape Verde Islands) and return early in 

 the next year." (Bolle, J. f. O. 1857, pp. 322, 323.) 



" Large numbers of C. pallidus arrived early in February and the 

 main body of C. unicolur later." (Meade-AValdo, Ibis, 1889, 

 p. 4.) 



" This little Swift is extremely abundant all the year except from 

 about October 10 to the beginning of January, but occasionally 

 birds turn up when the main body is absent." (.Meade- Waldo, 

 Ibis, 1893, p. 194.) 



"Black Swifts in flocks 24 December, 1888 and 9 January, 1889; 

 three seen 20 January, 1888, several 23rd." (Meade-Waldo, 

 MS. diaries.) 



" One of the flrst species which arrives at the beginning of spring.'' 

 (Cabrera, Catalogo, 1893, p. 36.) 



" Leaves Tenerife after the breeding season (autumn) and returns in 

 the spring." (Von Thanner, ' Einiges iiber das Vogelleben 

 Tenerifes,' 1906, p. 3.) 



Pal ma. 



" Noted in this island on 26 March." (Koenig, J. f. O. 1890: p. 474.) 



" The Black Swifts had not yet arrived when I left the island on the 



8th of February." (Von Thanner, Orn. Jahrb. 1908, p. 207.) 



Gomera. 



A bird shot May 8. (Meade- Waldo, MS. diaries.) 



IIie7'70. 



No particular record, though the bird is sure to occur here. 



