622 MR. E. W. WHITE ON BIRDS [June 20, 
flies very high, in large flocks extended in line. When on the wing, 
it utters a distinct articulate vocal sound, which has led man to 
cultivate this capacity to a high degree. 
The variation in colouring is found to be great both in proportion 
and situation, the head sometimes being of a uniform yellow. 
155. P1loNus MAXIMILIANI (Kuhl). 
3. Rio Vermejo, Oran, Salta, Arg. Rep., Nov. 10, 1880. 
Tris brown. 
Only one specimen seen, perching on one of the topmost branches 
of a high tree in the dense forest on the banks of the Vermejo. 
156. STRrx FLAMMEA (Linn.). 
d. Concepcion, Misiones, Arg. Rep., June 20, 1881. 
Iris dark. 
These Owls are commonly met with all over the Republic ; but I 
shot this, the only one seen here, amongst the ruins of the old Jesuit 
town. 
157. Asio BRacHyorTUs (Forst.). 
3d. Monte Grande, Buenos Aires, Arg. Rep., March 1, 1882. 
Tris light yellow. 
These Owls are very common all over the campos of the pro- 
vince of Buenos Aires, where they make night hideous by their 
hooting. 
158. PHoLEopTyNx CUNICULARIA (Mol.). 
3. Salto, Buenos Aires, Arg. Rep., Oct. 10, 1881. 
2. Pilciao, Andalgala, Catamarea, Arg. Rep., Sept. 17, 1880. 
2. Concepcion, Misiones, Arg. Rep., June 22, 1881. 
Inis light yellow. 
In Misiones this bird exceeds in size and differs in colour from 
that of the campos of Buenos Aires, as the black soil of the pampas 
differs from the red clay of Misiones. I saw two or three brace 
upon the open undulating grass-lands here ; but they are generally 
observed perched upon an ant-hill, beneath which they burrow their 
nest, as no friendly Biscacha is here present to offer them an asylum. 
The rather rough nest, situated in a burrow about three feet in 
length, but which descends not more than two below the surface, is 
composed of dry hemlock and sticks, without any downy lining. 
The eggs, of which there are usually four in a clutch, are of a 
spotless milky white and bluntly rounded at both ends. They 
measure, axis 34 millim., diam. 26 millim. 
159. Burro prerocues (Temm.). 
3 2. Monte Grande, Buenos Aires, Arg. Rep., April 13, 1882. 
Tris dark brown. 
I have observed four or five or this species at Monte Grande, but 
in no other part of the Republic. 
