Expedition to the Eastern Canary Islands. 233 



The only breeding birds resident throughout the year 

 which are not indigenous to the eastern islands^ and which 

 I do not consider separable from either (A) the typical 

 species, or (B) the form inhabiting the opposite mainland of 

 Africa, are the following: — 



*1. Corvus cor ax tmgitanus. 



2 J Passer hispaniolensis hispaniolensis, 

 *3. JJpupa epops epops. 



4. Faico peregrmus pelegrinoides. 



5. Pandion halia'etus halia'etus, 



6. Neophron pe7'cnopterus. 



7. Pterocles arenarius. 



8. Cursorius gallicus gallicus, 



9. yEgialitis alexandrinus alexandrinus. 



10. Larus cachinnans. 

 and possibly 



11. Coturnix coturnix africana. 



Even in this short list two species marked with an 

 asterisk (^) have been described as geographical races and 

 given new subspecific titles_, which for reasons hereafter 

 explained I am unable to recognise. Partial migration of 

 several of the above species undoubtedly takes place. 



Besides the Petrels there are a few birds which visit the 

 eastern islands to breed and having done so again take their 

 departure, i. e. the Turtle Dove (^Streptopelia t. turttir^, the 

 Corn Bunting (Emberiza c. calandra), and the migratory 

 Quail (^Coturnix c. coturnix). It is also possible, but 

 confirmation of this is necessary, that the House Martin 

 (JDelichon u. urbica^ remains in small numbers to breed in the 

 little island of Allegranza and, at the same time, in certain 

 districts the Pale Swift (^Micropus murinus brehmorutn) un- 

 doubtedly remains to breed. The remaining species and 

 subspecies which I met with in the eastern Canary Islands 

 all belong to regular or casual visitors to the group which do 

 not breed in the eastern islands. The majority, it will be 

 seen, are Waders which touch at the islands during the spring 

 and autumn migrations. It is obviously impossible without 

 long residence in an island to determine to what extent the 

 migration of any particular species takes place. We can 



