first assumption of the Black-throat it is generally varied
with a few white feathers, <
Young birds measure twenty-three or twenty-four inches
in length, and closely resemble the young of the. Northern
Diver, except in size. ‘
The form and structure o f the -legs and feet- hi these
Divers, and also, in the Grebes, are .-worthy of particular examination.
Though almost useless on land, these members
are most efficient dnstruments in the wateT. dThe -hones are
broad and flat, and almost as thin as the "blade of' a knife);
when the backward stroke in swimming is given,*the' whole
surface of all thése bones and their."investing membranes-is,
brought to hear against the water;; but when t h e « i s to
be -brought forward again tó‘ renew thé' impulse, the sharp
edges only are opposed to the fluid, anid the position,, as well
as the partially roiatory motion, jeemind the - obseryer-ofdfehe
action of oars In rowing when" used?.by JjKlful hands';; Those
who have the opportunity of examining 4hHfegmfia Div,e%dn
a recently-killed specimen, whitewall- the-fparts -retain ttheir
perfect flexibility^will find a beantifé^^amplè. o f animal
mechanics^ -
The figure'below represents the-, form ofthedfoót in th is
genus of birds..
WATATORES. COLYMBIDÆ.
T H E RED-TH RO A T ED D IV E R .
^ à ^ iW ü iis ^ ^ n tr io r ié lü ^ R ie â ^Ù n p o a tjê iC ÏD iv e r , PÉîftj.lBrit, Zool. vol. ii. p. 169.
^ t t j l a l u s , Speckled. ,,
sepMU'trinna.lii, Red-throated ,,,
1 ' '‘Specklede'
septenkrwiuilis; Red-throated ,,
. ste^latus, tj&M speckled
^ S e c o n d speckled,,
168.
Most. Ornith'. Diet.'
septentr
-Bewick, Brit. Birds, vol.ii, p. 199.
■ » >f » >>■ 201.
202. ïonàlis,:fR/ed^thrbâied‘ Fi.em. Brit. An. p. Ï33.
jÿy/t «1- , ,, SjELBYyBrit, Ornith. vol. ii. p.414.
» , ,, J enyns, Brit. Vert. p. 257.
it *'»-»" f GdtrLîi,-Birds of Europe, pt. r.
■ .Plongeon A gorge rouge, Temm. Man. d’Ornith. vol. ii. p. 916,