THE BIRDS OF THE JUAN FERNANDEZ ISLANDS 3 



than those during which the Swedish expedition visited the place. On the 



other hand, the number of accidental visitors will increase by and by, as it is 

 much due to the ever changing vicissitudes of wind and weather. 



Turdus magellanicus King 



Masatierra: i ? V12, i c? Vi2, i cT ^Vi2 1916. 

 Masafuera: i c^jnv. ^^2 1917. 



The adult specimens agree in a general way with descriptions in the 

 literature, as f. i. Seebohm's in Cat. Birds B. M. Vol. V, p. 223 (the plate, 

 Nr. XIV, appears quite incorrect) and SCHALOw's in Fauna Chilensis i, p. 747, 

 but they are more richly coloured with buff below than specimens from the 

 main land available to me. The back has also a somewhat more olivaceous 

 tint than in specimens from Chile. This may, however, be variable and perhaps 

 disappears through abrasion. The young bird has rather large blackish apical 

 spots on the otherwise buff-coloured feathers of the breast and flanks, less on 

 the fore neck. The feathers of the upper back as well display the usual ju- 

 venile pattern with whitish shaft stripes and apical semilunar black spots. The 

 wing-coverts have pale huffish shaft stripes and the upper tail-coverts narrow 

 whitish shaft stripes. This description differs in several respects from the one 

 communicated by SCHALOW (1. c). He speaks of the lower side being »intensiv 

 rost-braunlich, die einzelnen Federn mit dunklen Saumen, so dass eine dunkle, 

 wellige Zeichnung entsteht . . .» The young bird of the present collection does 

 not display any undulated pattern on the lower side and the solid shape of 

 the apical spots seem to prevent such a pattern. 



The variation in size of this thrush is rather great. The length of wing 

 of the males in this collection is 138 and 139 mm, while that of the female is 

 only 131. As SCHALOW records 125 in a male bird, difference in size appears 

 to be independent of sex. In specimens from Chile I have found a variation 

 between 126 and 134 mm. According to Mr. BaCKSTROM the Thrush was 

 common on both islands, although somewhat less numerous on Masafuera. On 

 Masatierra, it feeds largely on the fruits of Aristotelia maqui, an introduced 

 plant, which is almost wanting on Masafuera. The nest is a rather firm struc- 

 ture consisting mostly of old leaves or, rather, the netlike skeletons of such, 

 baked together and mixed with a few stalks. The inside is lined with dry 

 grass. The outer diameter measures 14 — 15, the inner about 9 cm, the height 

 about II cm. The colour of the eggs is as described in Cat. Birds' Eggs B. M. 

 Vol. IV, p. 103. 



Anaeretes fernandezianus Philippi 

 Native name: Torito. 



Masatierra: Males, i 2V12, 1 "/12 1916, i '°/i, i ^^3, 4^74 1917; Females, 

 1^712, i"/i2 1916, I '7i, 229/4 1917. 



The white colour at the tips of the rectrices spoken of by SCHALOW is 

 generally present, but may be worn away in some specimens. 



