277 
M. F. Pollen on the Genus Oxynotus. 
are white, changing on the upper parts of the breast into dirty 
white mixed with grey, which extends over the belly. The pri¬ 
maries are black, with the basal half or more of the inner webs 
white, so as to form a concealed white bar, the fourth and fifth 
being also externally edged, and, as well as the secondaries, 
tipped with white. .The rectrices are black, edged above with 
grey, and broadly tipped with white. The under tail-coverts 
are white. Bill black ; legs lead-colour. 
The males of the Reunion species have the upper part of the 
head, back, and rump of a clear bluish-grey. The chin is white, 
changing on the throat into bluish-grey, which extends over the 
breast. The primaries and secondaries are much as in the Mau¬ 
ritian species, but the white edgings and tips less conspicuous. 
The rectrices are black, broadly tipped with white. The belly 
and under tail-coverts are white. Bill brownish black; legs 
dark lead-colour. 
But it is in the plumage of the other sex that the greatest 
diversity is to be noticed. The adult females of the Mauritian 
species have the upper part of the head dark olive-brown, with 
a yellowish line over the eye; the lores grey; the cheeks 
yellowish-white, striped with dark brown. Upper parts of the 
neck, back, and rump dark rufous-brown. Chin rufous-white, 
streaked with brown, and passing into bright ferruginous, which 
extends to the vent; the tibial feathers slightly barred with 
dark brown. Remiges and rectrices dull brown, edged with 
ferruginous, the latter broadly tipped with dull ferruginous- 
white. Bill brownish-black; legs dirty lead-colour. 
In the Reunion species, on the other hand, the adult females 
have the upper parts of the head, back, and rump dark olive- 
brown, tinged with ferruginous on the latter. A whitish line 
over the eye; the lores and cheeks bluish-white, streaked with 
dark grey. Chin bluish-white, passing into white slightly 
tinged with ochraceous, which extends to the vent, and is thickly 
barred with dark brown on the sides of the neck, the breast, 
belly, and tibiae. Primaries dull brown, narrowly edged with 
fulvous-white; secondaries the same, but more broadly edged 
and tipped with fulvous-white; tertials edged with light ferru- 
