pate 
Neighbourhood of Buenos Ayres. 159 
abundant, and is now (October) nesting everywhere. The 
nest is made of moss, lined with hair, and sometimes a little 
wool ; it is usually to be found at the foot of a small tree or 
bush. The complement of eggs seems to be four; they vary 
exceedingly, but always have the appearance of belonging to 
a Finch. From the 5th to the 10th of September I saw 
Chrysomitris magellanica common near Ranchos, about 70 
miles from Buenos Ayres; they were frequenting the Eu- 
calyptus trees planted in the neighbourhood. 
IcTERIDA. 
Molothrus bonariensis I frequently see, being most common 
in marshy ground. <Ageleus thilius was in flocks at Punta 
Lara on June 29th, when I shot a male; the females were 
scarcer, and did not mix with the other sex, but were also in 
flocks. In October the species was common at Belgrano, 
but in pairs. On July 8th I saw four individuals at Punta 
Lara ; one of those I shot had been feeding on some aquatic 
plants, the seeds of which were in its mouth when I picked 
it up. I have not seen this bird since, but am told that it is 
common and resident here. Sturnella defilippit is common in 
the winter in large flocks. 
TYRANNID. 
Sisopygis icterophrys is pretty common in damp situations 
amongst trees and low bushes, from the Ist to 13th October. 
From May to September I saw many Lichenops perspicillata, 
usually singly, at most in pairs. I feel pretty sure that the 
female is the ferruginous, and the male the black bird, as I 
have constantly seen the two paired. On October 13th they 
were still common, but not yet building. 
On August 3rd I shot a specimen of Machetornis rixvosa 
from a flock that. were dusting themselves in the road; it 
does not appear to be a common bird. Mapalocercus flavi- 
ventris is abundant in rushes and low bushes from October 
Ist to the middle of the month. _Serpophaga subcristata 
is common here; its nest is a beautiful little structure 
of lichen and horsehair, lined with feathers. I have taken 
several nests, none of which contained more than two eggs. 

