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Obey: PROCEEDINGS OF THE NATIONAL MUSEUM. 335 
It appears from this series that the yellow on the fore-neck appears 
before any of the other parts change color, for in all the specimens, 
even in those quite gray on the back and yet without yellow on the 
rump, the chin, throat, and chest (prepectus), are of arich orange, paler 
and more gamboge behind. The yellow superciliary streak is also pres- 
ent in all. The change of the gray feathers to black seems to start 
on the forehead and the part adjoining the yellow on the fore-neck, for 
even in the specimens which have undergone the least change (Hen- 
son’s Nos. 685 and 690) the anterior half of the crown, cheeks, and a nar- 
row band down the sides of the neck bordering the yellow throat are 
black; the white spot formed by some of the upper wing-coverts has 
also appeared, and a few of the latter havealso turned black; the upper 
tail-coverts are just changing to black, No. 690 being particularly inter- 
esting in showing some of the latter black at the base and russet, as in 
the young plumage, towards the tips; in these specimens the yellow is 
just making its first appearance on the rump; both have the remiges 
still brownish gray, as is also the tail in No. 685; but in No. 690 the tail- 
feathers are already pure black. Itis worthy of remark that the change 
_is not equilateral, nor does it take place regularly or on one side in pref- 
erence to the other. Itis also a noteworthy fact that, while in the 
European Black-and-White Flycatchers the change is only one from 
gray to black or white, the reecolorescens in Zanthopygia also embraces 
the yellow of an exceedingly bright and rich tint. 
No. 680 is like the foregoing ones, but black commences on the left 
scapulars; the rump is nearly entirely yellow, and the tail black. No, 
688 similar; back clouded with black; but tail brownish gray. No. 689 
is but slightly more ahead: rump intensely yellow, nearly cadmium; 
tail black; and the second tertiary in left wing deep black; yellow on 
breast in this and foregoing three specimens somewhat farther back. 
No. 677 is black on scapulars and interscapulars, and the tertiaries are 
just changing; but there is less black in the upper wing-coverts than 
inany of the foregoing; tail black. No. 691 similar, but blacker on 
hind neck and wing-coverts, and more yellow on lower breast and abdo- 
men; longer tertiaries brownish gray; tail black. “No. 684 differs only 
in having the tail brownish gray. No. 685 again has the tail and two 
shorter tertiaries black; otherwise no difference. No. 692 identical. In 
all the foregoing specimens, as well as in the one in the National Mu- 
seum and in Petersen’s collection, the occiput is still gray. They agree 
therefore closely with the upper figure in the plate (xvii C) in Fauna 
Japonica, which gives an excellent idea of these birds in the last stage 
of transition. It seems, therefore, as if the occiput regularly is the last 
part of the smaller plumage to assume the black color. No. 693 has 
finished the change on the body, but the remiges are still brownish 
gray, except the three tertiaries in the left wing and the two shorter 
ones in the right; the black on back and upper head, moreover, has a 
strong wash of olive, 
