C,,A P. XVI. 
SEASONAL CHANGES OF PLUMAGE. 
217 
tlie 
species, the sexes of which are alike during both 
summer and winter, tiie young may resemble 
adults, firstly, in their winter dress ; secondly, 
^Lcly occurs much more rarely, in their summer 
t j ° 8s > thirdly, they may be intermediate between 
j. ' ese two states ; and, fourthly, they may differ greatly 
of * the adults at all seasons. We have an instance 
the first of these four cases in one of the egrets 
y tudia ( Buphus coromandus), in which the young and 
adults of both sexes are white during the winter, 
adults becoming golden-buff during the summer. 
^ dU the Gaper (Anastomus oscitans) of India we 
f. Uv ° a similar case, but the colours are reversed; 
the young and the adults of both sexes are grey 
du • l at "k during the winter, the adults becoming white 
Ong the summer . 43 As an instance of the second 
hi* 6 ’ the young of the razor-bill (Alca iorda, Linn.), 
a u early state of plumage, are coloured like the 
'fits during the summer; and the young of the 
^ ite-crowned sparrow of North America (Fringilla 
^ c °phrys), as soon as fledged, have elegant white 
^ ‘P e s on their heads, which are lost by the young and 
6 °hl during the winter . 44 With respect to the third 
( ^ Se > namely, that of the young having an intermediate 
factor between the summer and winter adult plum- 
fefes > Yarrell 45 insists that this occurs with many 
‘ Ii u Jon > 1 Omith. Biography,’ vnl. i. p. 172. For the Maluri, Gould’s 
^adliook of the Birds of Australia,' vol. i. p. 318. 
. * “W indebted to Mr. Blyth for information iu regard to the 
An " 1 *’ Beo ft lso Jordon, ‘Birds of India,’ vnl. iii. p, 741). On the 
^tomns, see Blyth, in ‘ Ibis,’ 1867, p. 173. 
0„ 1 the Aloa, see MacgiJIiviay, ‘ Hist. Brit. Birds,’ vol. v. p. 347. 
h ete ^) e Fringilla kueophrys, Audubon, ibid. vol. ii. p. S9. I shall have 
to refer to tlie young of certain herons and egrets being 
History of British Birds,’ vol. i. 1839, p. 159. 
