32 
Mr. H. Durnford on some Birds observed 
birds showed great anxiety at my presence, allowing me to 
come within a few feet of them. They appeared to be pre¬ 
cisely alike in size and plumage. 
Troglodytes eurvus. 
Pretty common. The Chuput-valley Wren is smaller than 
any Buenos-Ayres examples I have seen. It has a slightly 
rufous tinge about the vent; but I do not think the difference 
sufficient to indicate that the species are distinct. Four eggs 
which I brought back with me are slightly smaller than eggs 
of T.furvus from here. It has been thought there may be two 
species of Wrens in Buenos Ayres; but this question can only 
be decided by the acquisition of more specimens. A slight 
discrepancy in size alone is not sufficient to establish another 
species. The Chuput bird is less than the smallest race, or 
whatever it should be called, of our Buenos-Ayres bird. 
Anthus correndera*. 
Common throughout the valley and on the hills where there 
was any grass. 
Progne purpurea. 
Pretty common about the Tosca cliff, up the valley, in the 
crevices of the rocks of which it was breeding. The male is 
uniform glossy steel-blue, and easily distinguishable from the 
female, whose underparts are speckled with grey, lightest 
about the vent. Both sexes uttered harsh screams whilst we 
were sitting under the cliff. A few seen at Ninfas Point. 
Atticora cyanoleuca. 
Pretty common. Nesting in holes in the banks in some 
of the upper reaches of the river. 
Hirundo leucorrhoa. 
Also common. On the evening of the 25th November I 
observed many birds of this species congregating as if for a 
migratory movement. 
* [Mr. Durnford’s collection contains two specimens of this species, 
one from Punta Lara, the other from Flores, near Buenos Ayres. He 
has not sent any from Chuput.—0. S.] 
