4 EINAR LONNBERG 
This bird is common enough in the forest, especially among brush wood 
near the tree-limit, but no nest was discovered. Like previous observers, Mr. 
BACKSTROM remarks on its*resemblance to titmice in its general behaviour. 
Aphrastura (Oxyurus) masafuerae Philippi 
Masafuera: 1 ¢ 18/2 1917. 
According ‘to Mr. BACKSTROM, this bird is scarce and difficult to obtain. 
Probably it is almost confined to the higher parts of the island, where Dick- 
sonia is common in the forest. Two specimens were seen in a fern grove 
above Varadero, two more in Quebrada de las Chozas. : 
Cinclodes oustaleti baeckstroemii n. subsp. 
Native name: Chureta. 
Masafuera: 1.f"1/s,/1 dr 2 7/2, 12 78/2,1 2 le, 1 7/2, ks fee 
Masatierra: 1 ¢ 7!/3 1914. 
In the literature, the Czzclodes of Masafuera is generally recorded as C. 
fuscus Vieill. There is, however, a very perceptible difference between the ty- 
pical C. fuscus from Argentina and the bird from Masafuera, with regard to 
size as well as to colour, the former being very much larger and lighter. Then, 
the question arises whether the island bird is identical with any of the Czy- 
clodes which have been named and described from Chile. C. zzgrifumosus may 
at once be excluded, because it is too large (wing 113 mm), »brownish black» 
beneath and has »the outer rectrices tipped with cinereous» (Cat. Birds B. M. 
Vol. XV, p. 22). C. patagonicus Gm. appears to have a greater length of 
wing, 95 mm. (acc. to SCOTT, Bull. B. O. C. Vol. X, p. 62, still larger or 4.1 
in. — 103 mm.) than the present specimens, and »the external tail-feathers with 
light ashy tips» (Cat. Birds 1. c.). In 1900, W. E. D. ScorTT, |. c., described 
C. molitor from Chile, which bird HELLMAYR (Nov. Zool. Tring, Vol. 21, p. 
175, 1914) proved to be identical with Opetiorhynchus rupestris Kittlitz and 
thus named C. patagonicus rupestris Kittl. This bird is also considerably larger 
than the one from Masafuera, with the length of wing 99--102 mm. 
There remains then for comparison only the smaller C. oustaleti Scott, 
l. c. The diagnose by the original author is very short, but fortunately HELL- 
MAYR (I. c.) has examined the type and added a little to the description. Be- 
fore a comparison is made with C. oustaletz Scott it seems convenient to give 
a description of the bird from Juan Fernandez, which fortunately is available 
in a good series. 
Upper parts of head very dark grey with a touch of leaden colour, dar- 
ker than, and perceptibly different from the colour of the back, although gra- 
dually blending into the same on the upper neck. Back, rump and upper tail 
coverts more brownish than head, similar to sepia 300,2 of OBERTHUR and 
