Range. - Nortli Atlantic and North Pacific Oceans, breeding from Maine and from the Farallones, northward to Greenland and the Aleutians.

These are the most common of the Petrels found on our coast; they are eight inches in length, of a sooty brown color, and have a white rump. The forked tail will at once distinguish them from any of the Atlantic Petrels. They nest in burrows in the ground, laying a pure white egg, sometimes with a very faint dusty wreath about the larger end. Size 1.20 x .95. These birds generally take turns in the task of incubation, one remaining at sea during the day and returning at night while his mate takes her turn roving the briny deep in search of food.

The young are fed by regurgitation upon an oily fluid which has a very offensive odor. This odor is always noticeable about an island inhabited by Petrels and is always retained by the eggs or skins of these birds. They are very rarely seen flying in the vicinity of their nesting island during the day; the bird that is on the nest will remain until removed by hand. Data. - Pumpkin Is., Maine, June 22, 1893. Single egg; nest of a few grasses at the end of a burrow dug in the bank. Collector, J. Lefavour.

Kaeding's Petrel. Leach's Petrel. Guadalupe Petrel

Kaeding's Petrel. Leach's Petrel. Guadalupe Petrel.

White

White.

106.1. Guadalupe Petrel. Oceanodroma Macrodactyla

This species, which is very similar to the preceding, except for a longer and more deeply forked tail, breeds on Guadalupe Is. Their eggs are white very minutely wreathed with reddish brown; they are, however, nearly always nest stained to an uneven brownish color. Data. - Guadalupe Is., Lower California, March 24s 1897. Single egg laid on a few oak leaves and pine needles at the end of a three foot burrow. Size of egg 1.40 x 1.00. Collector, A. W. Anthony.

White, nest stained

White, nest stained.

106 1 Guadalupe Petrel Oceanodroma Macrodactyla 183Kaeding's Petrel. Leach's Petrel. Guadalupe Petrel

Kaeding's Petrel. Leach's Petrel. Guadalupe Petrel.