540 Mr. D. A. Bannerman on the [Ibis, 



Apart from anything else such restricted insuhir distri- 

 bution is very remarkable, but of more interest still is the 

 distribution of the different grou[)s of birds in the various 

 islands. 



Those who have read my description of an expedition 

 Avhich 1 made to the Eastern Canary Group in 1913 (the 

 report of which appeared in 'The Ibis,' 1911, pp. 38-90, 

 228-293) will not be surprised to learn how strikingly dif- 

 ferent is the avifauna in those barren islands, for they will 

 be already aware of the peculiar physical characteristics 

 enjoyed by Fuerteveutura and Lanzarote and the contrast 

 which exists' between them and the islands of the western 

 group — Gran Canaria, Tenerife, Palma, (iomera and Hierro 

 — brieliy alluded to in the early part of this paper. Detailed 

 insular distribution in the Archipelago is given for each 

 bird in the Systematic List in my present paper, but a 

 more general review of the range of certain species will serve 

 to show how limited this distribution often is. 



There are very few Resident birds which can be said 

 to have anything like a general distribution in the Archi- 

 pelago — that is to say, the same species or subspecies being 

 found on all the seven large islands — in fact, only seven in 

 all : — Corvus corax canariensis, Emberiza caUmdra thanneri^ 

 Anthus bertlieloti bertheloti, Sylvia laelanocephala leiico- 

 gastra, Buteo buteo insulurnm, Pandion haliaetus halia'etus, 

 and Columba livia canariensis. 



The Kestrel is also found in all the islands, but is repre- 

 sented in the western and eastern groups by two distinct 

 geographical races, Tinnunculus t. canariensis in the western, 

 T. t. dacotice in the eastern group. 



The Brown Linnet has found its way to every island, and. 

 is represented in the eastern group by Acanthis cannabina 

 harterti, and m the western group by A. c. meudewaldoi. 



The same remark ajjplies to the Thick-knee, CEdicnemus a>,. 

 distinctas being found in the western group, (E. oe.insularum 

 in the eastern group. 



Likewise the Titmice have s])read over the entire Archi- 

 pelago, but have branched into various subspecies^ each race 



