(FIERCE TYRANT.)
+Myiarchus tyrannulus+, _Scl. et Salv. Nomencl._ p. 52; _Durnford,
Ibis_, 1878, p. 61 (Buenos Ayres); _White, P. Z. S._ 1882,
p. 608 (Salta); _Barrows, Bull. Nutt. Orn. Cl._ vol. viii p. 202
(Entrerios). +Myiarchus ferocior+, _Cab. J. f. O._ 1883, p. 214
(Tucuman).
_Description._--Above dark cinereous, more or less olivaceous; wings
and tail blackish; wing-coverts and outer secondaries with more or
less defined edgings of dirty white; beneath, throat and breast
cinereous, abdomen and under wing-coverts sulphur-yellow; bill dark
brown; feet blackish: whole length 7·0 inches, wing 3·6, tail 3·4.
_Female_ similar.
_Hab._ Southern Antilles, and South America down to Argentine Republic.
There has been great confusion between this species and _M. tyrannulus_,
from which the present bird may be distinguished by the absence of the
rufous edgings to the inner webs of the rectrices.
Examples of _M. ferox_ are in the British Museum from Punta Lara
(_Durnford_), Mendoza (_Weisshaupt_), and Buenos Ayres (_Haslehurst_).