356 NATATORES. FULIGULA. Scaup Pocuarb:- 
soon becomes tame, and, if provided with water, thrives well 
upon grain, and other food eaten by poultry, and, under this 
regimen, its flesh is said to improve in flavour, and not to be 
inferior to that of the Wild Duck. It makes a hoarse grunt- 
ing sort of noise, and has a singular habit of tossing up its 
head, and opening the bill, which, Monracu observes, is par- 
ticularly the case during spring, whilst it is swimming and 
sporting on the water. The trachea of the adult male is of 
considerable diameter for three-fourths of its length, and is 
composed of semi-cylindrical rings, united by a membrane, 
which makes up the measure of the tube; and, about an 
inch above the lower larynx, where it is greatly contracted, 
these rings become entire. ‘The labyrinthian part, as in the 
other species, consists of a bulging and strongly-ribbed orca 
or box, on the same line as the tracheal tube, and a tympa- 
num or drum, rather narrower and higher than that of Fu- 
ligula ferina, and having the bony arch, which divides and 
supports the membrane on its outer face, somewhat different 
in proportions and form. 
PLaTE 66. represents the Adult Male of the natural size. 
ans Head and upper part of the neck blackish-green, with 
tion. rich glossy reflections. Lower part of neck, breast, 
Male. © and rump deep black. Mantle and scapulars greyish- 
white, with fine distant zigzag black lines. Lesser wing 
coverts black, with transverse zigzag white lines. Second- 
ary quills white, with black tips, forming a bar or spe- 
culum across the wings. Belly and flanks white. Ab- 
domen rayed with lines of blackish-grey. Bill clear 
greyish-blue, broad and spathulate, with the nail black. 
Inides king’s-yellow. Legs and toes bluish-grey, the 
joints and webs being darker. 
Piate 66*. 
Female. In the female (formerly supposed a distinct species, under 
the title of Anas frenata), the bill is of a deep-grey 
