I. The Birds of the Juan Fernandez Islands. 



By 



EINAR LONNBERG. 



With 4 text figures. 



The material on which this paper is based has been collected during the 

 Swedish Pacific Expedition 1916—17, under the direction of Dr. Carl Skotts- 

 BERG. Mr. KAre BackSTROM was the zoologist of the survey, and he kindly 

 furnished me with some notes concerning the occurrence and oecology of the 

 birds. These notes are quoted in the following. 



On the Juan Fernandez Islands, birds have been collected several times. 

 In 1897, H. SCHALOW reported on the birds collected by Dr. Plate on Masa- 

 tierra and he also communicated (in Fauna Chilensis, Zool. Jahrb. Suppl. Bd. 

 IV, Jena 1897—98) a list of the birds up to that time known to occur in the 

 Islands, viz. 11 for Masatierra, 7 for Masafuera and 3 common to both. One 

 year earlier JOHOW had published a list (in Estudios sobre la flora de Juan 

 Fernandez, Santiago 1896), which contains 14 names of birds, one of which 

 was not known to SCHALOW. 



With our present knowledge, it can be stated that not less than 30 spe- 

 cies have been observed on the islands. These species may be suitably ar- 

 ranged in the following groups: 



Indigenous land birds (8 sp.): 



Masatierra Masafuera 



Turdus magellanicus Turdus magellanicus 



Anaeretes fernandezianus Aphrastura (Oxyurus) masafuerae 



Cinclodes oustaleti baeckstroemii Cinclodes oustaleti baeckstroemii 



Eustephanus fernandensis 



» galeritus 



Cerchneis sparverius fernandensis 

 (Buteo erythronotus exsul) Buteo erythronotus exsul 



I — 80184. The Nat. Hist, of Juan Fernandez and Easter Isl. Vol. III. 



