84 Mr. C. H. B. Grant on Birds collected in Argentina , 
The nest is placed in a bnsli or low tree, often in a very- 
exposed situation; it is composed of thorny twigs and lined 
with rootlets and hair. 
4. Mimus triurus. 
Mimus triurus Sharpe, Cat. B. vi. p. 342; Arg. Orn. i. 
p. 8, pi. i. 
a. ^ ad. Monte Alto, Paraguay. Aug. 25, 1909. 
b. <$ ad. Colonia Risso, ,, Sept. 8, 1909. 
Irides olive-green; bill blackish horn-coloured, pearly at 
base of lower mandible; legs and toes dull black. 
5. PoLIOPTILA DUMICOLA. 
Polioptila dumicola Sharpe, Cat. B. x. p. 444; Arg. Orn. 
i. p. 12. 
■a. ? 
b. <? 
c. S 
d. e. 
/,&■ 
h. ? 
i. <? 
ad. 
ad. 
Los Ynglases, Ajo. 
Sept. 27, 1908. 
Oct. 31, 1908. 
Feb. 15, 1909. 
Mar. 4-12, 1909. 
June 8, 1909. 
Aug. 10, 1909. 
Oct. 20, 1909. 
young. „ „ 
6 ad. & ? yg. „ „ 
3 ¥ ad. „ ,, 
ad. Villa Franca, Paraguay, 
ad. Cabo Emma, „ 
3 . Irides hazel; bill slate-coloured, darker at tip; legs 
and toes slate-coloured. 
? . Irides hazel; bill, legs, and toes blue-slate-coloured. 
3 juv. Soft parts as in adult; gape yellow. 
The October birds are rather faded compared with those 
of June and August, and the March adult is much worn 
and faded, and is starting to moult. 
The June male is in complete new dress, except for the 
tail. 
The young female taken in March has only blackish tips 
to the ear-coverts and is moulting. 
The young male is as follows :—“ Similar to adult female 
except forehead and ear-coverts grey, the latter faintly 
bordered with blackish ; and the whole of the upper parts 
more grey than blue.” 
