868 Mr. E. Hartert on some Species of 



from which it is distinguished by its very small size and by 

 the less extended white colour on the underside only. The 

 discovery of Uratelornis chimcera, Rothsch.^ and of this 

 interesting Swift would seem to indicate that the avifauna 

 of Madagascar is not yet entirely explored^ in spite of the 

 many collections made there and of the excellent works 

 written on it. 



In the measurements of Tachornis batassiensis in Cat. B. 

 xvi. p. 466 is a misprint (or slip of the pen)^ the lateral 

 rectrices being 2*5, not 3"5 inches in length ! 

 -f- Chcetura zonaris pallidifrons, subsp. nov,, is a new sub- 

 specific terra which I must introduce for the large West- 

 Indian Spine-tailed Swifts. I noticed the difference of the 

 West-Indian specimens when writing the Catalogue of Swifts, 

 and kept the synonymy of the continental and West-Indian 

 birds separate, and made remai'ks about them on p. 477. 

 However, being cautioned most kindly by Mr. Salvin, who 

 gave me so much valuable advice during my work, I refrained 

 from distinguishing the West-Indian form. Now recently 

 I have been able to study quite freshly-moulted birds, in 

 most beautiful skins, sent by Mr. C. B. Taylor from 

 Jamaica to the Tring Museum, and I find that they show 

 the same characters as those in the British Museum — i. e., a 

 pale forehead and a short and very narrow, but very obvious 

 and well-defined supraloral line. I therefore do not hesitate 

 any longer to separate this form subspecifically. 



In the description of Chcetura cassini on p. 488, it should 

 be: '^ sides of body and under win(/-coverts," instead of 

 " under tail-coverts.^' 



The Genus Collocalia. 

 In 'The Ibis' (1895, p. 459), in one of his careful and 

 excellent articles on Philippine birds, Mr. Ogilvie Grant de- 

 scribed a new Collocalia, which he named C. whiteheadi. In 

 the following pages he made some valuable remarks about 

 C. loivi and about C. fuciphaga and its allies. With regard 

 to the latter, it is quite evident, from my words on p. 501 

 of the Catalogue, that I, when stating the differences of 



