326 Mr. J. H. Gurney’s Notes on 
but with the addition of one adult tertial, is preserved in the 
British Museum ; this example, which I may call No. 8, is 
merely labelled “ South America.” 
No. 9, from Costa Rica, is also in the British Museum, and 
appears to be a bird of about the same age as No. 4, with 
which it agrees in general appearance; but im some respects 
it approaches the darker type of immature plumage to which 
I have already adverted. Thus, the dark plumage on the 
crown of the head is more extended, both towards the fore- 
head and the nape, and especially in the latter direction, 
where it reduces the breadth of the white nuchal collar to 
about half an inch instead of two and a half inches, as it is 
in No. 4; the blackish mark behind the eye is also broader 
than in the specimens previously described, and extends back- 
_ wards till it completely joins the hinder part of the dark cap 
or crown-patch, which in the other specimens it either does 
not join at all, or at most very imperfectly. The white ear- 
coverts in this example have dark shaft-marks. The mantle 
differs from the other specimens which I have described in 
having the interscapulars of a somewhat darker hue, although 
no adult feathers seem to have yet appeared ; black shaft- 
marks are also apparent on a few feathers of the throat, and 
the tibial feathers have elongated blackish-brown centres ; 
on some of the white feathers of the breast a few very nar- 
row and faintly marked brownish transverse lines are just 
visible. 
The dark phase of plumage, to which I have already alluded, 
is also evidently an immature one, as all the examples of it 
that I have examined retain more or less of the rufous edg- 
ings to the feathers of the mantle, though I have seen none 
in which these are retained to so great an extent as in No. 1 
and in some other very young white-breasted examples. 
In this dark phase the nuchal collar is usually entirely 
absent, whilst in others it exists, but is rufous instead of 
being white* ; on the entire upper surface and sides of the 
* T have never personally examined one of these rufous-collared speci- 
mens, but such a one is figured by Temminck in the ‘ Pl, Col.’ pl. 270. 
Professor Schlegel, also, thus refers to examples of this description in his 
