are quite differently marked. In L. erythropterus, the third, fourth, and fiftli
primaries are the longest, and are equal to each other; the second is only a little
shorter than the third. In L . perspicillatus the third is rather shorter than the
fourth and fifth ; and the second is proportionally shorter relatively to the third,
so that the outer part of the wing in this species is more pointed than in L . ery-
throplerus. The hinder claw in the latter is only in an extremely small degree
straighter than in tiie former ; and this, considering that the L . perspicillatus is
generally perched, and when on the ground, can only hop ; and that the L. erythropterus
feeds there entirely, and walks, is very remarkable.
!. F l u v ic o l a ic t e b o p h r y s . D'Orb. Sf Lafr. Mag. de Zool. 1837. p. 59.
Muscícapa icteroplirys, Vieill. Eucyc. Meth. p. 832.
Le Suiriri noirâtre et jaune, Azara, No. 183.
Specimens were found by me both at Monte Video and at Maldonado, on tlie
banks of the Plata. I found Coleóptera in their stomachs.
2 . F l u v ic o l a I r u p e e o . G. R . Gray.
Tyrannus Irupero, Vieill, Ency. Metb. p. 856.
Muscícapa nicesta, Licht. Cat. p. 54.
Muscícapa nivea, Spix, Av. pl. 29. f. 1.
Pepoaza nivea, D ’Orh. SfLa/r. Mag. de Zool. 1837. p. 62.
Impero, Azara, No. 204.
This elegant bird, which is conspicuous amongst most land species by the
wliiteness of its plumage, is found, though not commonly, (in November) in Banda
Oriental ; whilst near Santa Fé, three degrees of latitude northward, it was common
during the same time of year. It is rather shy, generally perches on the
branches of bushes and low trees.
3. Fi.üvicola Azaræ. Gould.
P l a t e X.
1'. alba; alis, caudâ caudoeque tectricibus atris, his albo-marginatis; primariis Jlaves-
ccnli-alhis, basibus apicibusque nigris; rostro pedibusque atris.
Long. tot. 8-j% unc. ; alcv, 4 - ^ ; cattdoe, 4^%; taisi, 1 ; rost. 1.
Head, all the upper and under surface white; wings and tail black; tail coverts
black margined with white ; primaries broad and crossed near their extremity
with sulphur white, and tipped with brown ; bill and legs black.
Habitat, banks of the Plata.