602 



the honeycombed rocks, from which it emerges in flocks like a swarm of bees. In September 

 they had all disappeared from Teneriffe, and probably it wanders to the Cape-Verd Islands in 

 winter." 



I have never seen the eggs of this species ; nor do I know of any collection in which they 

 are. It breeds in the most inaccessible rocks ; and hence its nest is difficult to obtain. It is said 

 to breed in May or late in April, as Messrs. Webb and Berthelot heard the young birds calling 

 in a fissure of the rock in the Barranco de Martianez early in May, but could not succeed in 

 getting at the nest. 



The specimens described are the only two I have examined, the male being the specimen 

 figured on the same Plate with the Pallid Swift. 



*&* 



In the preparation of the above article I have examined the following specimens 



U Mus. Salvin and Godman. 

 a, d ad. Madeira, June 27th, 1871. b, $ . Teneriffe, April 23rd, 1871 {F. D. Godman). 



