LONG-TAILED JAEGER.
38. Stercorarius longicaudus. 20 inches.
This is the most swift and graceful of this family in flight. Similar to the last species, but the central pointed tail-feathers extend eight or ten inches beyond the others. It is more often found in the lighter phase.
Nest.—Their eggs are either laid on the bare ground or in a slight depression, scantily lined with grass (2.10 × 1.50).
Range.—Arctic America; south in winter to South America.
GULLS AND TERNS—Family Laridæ.
IVORY GULL.
39. Pagophila alba. 17 inches.
The little Snow Gull, as it is often called, in the breeding season is entirely white; the bill is tipped with yellow and there is a red ring about the eye.
Nest.—Of grasses and seaweed, on the cliffs in the Arctic regions. Three grayish buff eggs are laid marked with brown and black (2.30 × 1.70).
Range.—North of the Arctic Circle, and winters south to British Columbia.