180 Mr. H. F. Witherby on 



Algiers. There, at altitudes of from 5000 to 6200 feet, the 

 mountains are covered with a magnificent cedar-forest. 



It will be realized from these brief descriptions of the 

 places in which we worked that the birds of each district 

 were very different. A few species were, of course, common 

 to all the localities, but each place contained some which 

 we saw nowhere else. 



Algeria is easily accessible, and the travelling, though 

 slow, is easy, so that T can thoroughly recommend the country 

 to any ornithologist who desires an interesting holiday. 

 As attractions, he will find many extremely interesting 

 geographical forms of our British birds, besides many kinds 

 rare here but common there. 



The study of the geographical forms of birds has advanced 

 at such apace in recent years that one begins to hope that 

 enough material will soon be accumulated for some ornith- 

 ologist to take a wider view of the subject than that of the 

 systematise Will not Dr. Hartert's work, for instance, 

 afford a sufficiently complete and ordered statement of 

 the geographical forms existing in the Palaearctic region to 

 form a basis for studying many general questions regarding 

 geographical variation ? 



Turdus VISCIVORUS L. 



Turdus viscivorus deichleri Erlanger, Ornith. Monatsb. 

 1897, p. 192. 



Turdus viscivorus L. ; Erlanger, J. f. O. 1898, p. 248. 



S ad., May 16 ; ? ad., May 20; <$ juv., May 19. Les 

 Glaciercs, Little Atlas. 



The resident Mistletoe-Thrush in Algeria is, at all events in 

 summer, a very pale-coloured bird. For this reason the 

 late Freiherr von Erlanger separated it under the name of 

 T. v. deichleri, but afterwards, having examined freshly 

 moulted birds, he concluded that the pale coloration was due 

 to bleaching. I have not had an opportunity of examining 

 freshly moulted skins, but certainly the adult specimens 

 which I obtained in Algeria in summer are extremely pale 

 on the upper side, and have only a slight tinge of buff 



