472 NATATORES. STERNA. TERN. 
Pirate 89. Fig. 1. represents the Adult bird in summer 
plumage. 
General Bill, from the forehead to the tip, one inch and a half 
eae long; the upper mandible gently arched; and both the 
Adult mandibles more slender than in the Common and Arctic 
i species. Forehead, crown, and long feathers of the oc- 
ciput, intense black. Line from the base of the upper 
mandible, cheeks, neck, and the whole of the under 
plumage, of a glossy white, deeply tinged with rosy red 
(which fades in museum specimens when exposed to the 
light). Back and wing coverts pale pearl-grey. Outer 
web of the first quill-feather black; of the rest, hoary 
grey; inner web of the whole having a streak of hoary 
grey next the shaft, and the other part pure white. 
Tail pure white; with the outer feather on each side 
much produced, and reaching from two and a half to 
three inches beyond the tips of the wings. Legs and 
“toes bright red; the tarsi six-eighths and a half of an 
inch in length; membranes much scalloped; claws 
black. 
Young. Fig. 2. is the Young of the year, immediately previous to 
its departure in autumn. . 
Bill brownish-black, with the base orange-yellow. Fore- 
head and crown cream-yellow, tinged with grey. Region 
of the eyes, ear-coverts, and nape of the neck, greyish- 
black, mixed with yellowish-white. Throat, sides of the 
neck, and under parts, white. Ridge of wing blackish- 
grey, with the edges of the feathers paler. Back and 
wing-coverts bluish-grey, marbled with greyish-black 
and yellowish-white. Tail having the outer webs of the 
feathers grey ; the inner, and tips, white. Quills grey, 
margined with white. Legs pale gallstone-yellow. 
The winter plumage of this species has not yet been ascer- 
tained. 
