24 
alt.en’s naturalist’s liprary. 
Sterna macdougalli, Macgill. Brit. B. v. p. 648 (1852). 
{Plate XCVn.) 
Adult Male.— General colour above delicate pearly-grey, 
slightly paler on the rump and upper tail-coverts and inner 
secondaries, which are margined with white at the ends : wino-- 
coverts like the back, as al.so the bastard-wing and primary- 
coverts; quills pearly-grey, the primaries edged on the inner 
web and the secondaries on the outer web, with white • quills 
pearly-grey, darker on the inner webs, which have rather broad 
borders of white ; the three outer primaries with white shafts 
emphasized on the first by a blackish outer web, and alon^ the 
inner edge of the white shaft by a line of blackish, becoming 
dark grey toprds the end of the feathers ; the second and 
third primaries with a dark grey and broader line along the 
inner length ol the shaft, but the outer web frosted with pearly- 
grey ; all the other prim.aries white-shafted, with darker grey 
on the inner web, broader but not inclining to blackish ■ 
secondaries pearly-grey, with white tips and a good deal of 
white on the inner web ; tail-feathers pearly-grey, almost white, 
the long outer feathers nearly entirely white; crown of head 
and iiajie black, with a very distinct pointed crest ; hind-neck 
sides of face, and under surface of the body white, with a 
beautiful rosy blush, which disappears in time; the line of 
black and white on the sides of the head very sh.arply defined 
and extending across the lower half of the lores, below the 
eye, above the ear-coverts ; “ bill orange at the base the 
anterior part from the angle black; tarsi and toes orange’-red • 
by the end of May, in the northern hemisphere, the amount 
of black on the bill has largely increased” {Saunders). Total 
kngth, i37inches; culmcn, 1-45; wing, S'S; tail, 5-9; tarsus, 
_ Adult Female. Similar to the male. Total leno-th la-i 
inches ; wing, 8-5. ^ 
Adult in Winter Plumage.— Similar to the summer plumage 
but dilTeriiig in the forehead being spotted with white the 
under parts nearly white, with little pink tint; bill nearly 
black {Saunders). ‘ ^ 
Young.— Differs from the adult in being mottled with a black 
sub-tcrmmal bar to the feathers of the upper surface, quills, 
