XVI. 
THE YOUNG LIKE THE ADULT FEMALES. 189 
’’eg. 
(with the exception of the breast being spotted 
6 le Dgth of her tail, 
t| 1(; i bronze) the adult female in all respects including 
so that the tail of the male 
actual] i 
is becomes shorter as he reaches maturity, which 
* unusual circumstance . 3 Again, the plumage 
s pii ° ltJa ^ e goosander (Margins merganser) is more con- 
Vyjj. a °Usly colom'ed, with the scapular and secondary 
.fathers much longer than in the female, but differ- 
bii/ b° m what occurs, as far as i know, in any other 
H ! the crest, of the adult male, though broader than 
itu °* *be female, is 
ktt] 1CU * B1C , is considerably shorter, being only a 
k { ,iJ J a bove an inch in length ; the crest of the female 
bo / two and a half inches long. Now the young of 
&. ,, Se xes resemble in all respects the adult female, 
that’ 
r ° vv er than in the adult male . 4 
[j V. OG XJ.X IC/J-t/ JllX HI A HJOJ-HJULQ tuc Cl'-t.LiAU 
itr ^ b'oir crests are actually of greater length thorn 
^ch^ en yonng und the females closely resemble 
vj 0(j °ther and both differ from the male, the most ob- 
fled. 
J* s conclusion is that the male alone has been modi- 
-Even in the anomalous cases of the ldeliothrix 
Ierg u 8 > ^ is probable that originally both adult 
gw ' *ere furnished, the one species with a much cion- 
4 1 ' O Tl /l + h f~\ 4-h .11 . 4 1. s-t wt 1 1 r~± 1 nw a "I I 
Hi, 
and the other with a much elongated crest, 
‘Eult °^ aracters having since been partially lost byfthe 
^‘tt ^ a ^ es fr° m some unexplained cause, and trans- 
1U ^buir diminished state to their male offspring 
Vit ’ "ben arrived at the corresponding age of ma- 
hty. 
tw. 
; 0lle ha 
f he belief that in the present class the male 
fce s been modified, as far as the differences be- 
y (j|l)i l the male and the female together with her 
g are concerned, is strongly supported by some 
auj) 0 ^'is information to Mr. Gould who shewed mo the specimens ; 
* Hj , s ‘ Introduction to the Troehilidse,’ 1801, p. 120. 
°SiUivray, ‘Hist. Brit. Birds,’ vol. v. p. 207-211. 
