The upper parts are slaty black and under parts white. Bill and legs blackish; webs yellow. Length 10·5 in.; wing 7·4 in.
THE CAPPED PETREL
Æstrelata hæsitata (Kuhl)
Extremely little is known of this species, which used to nest in the West Indies. It has occurred here on one occasion only.
The crown, nape, and mantle are dark brown; hind-neck and upper tail coverts white; cheeks grey; forehead and under parts white; central tail feathers brownish black; the rest, white edged with brown. Length 16 in.; wing 11·3 in.
THE COLLARED PETREL
Æstrelata brevipes (Peale)
A single example of this Petrel was obtained off the coast of Wales in December 1889. The southern and western Pacific appear to be its true home.
The crown is slaty grey; rest of upper parts darker, becoming browner on the wing coverts. Forehead and throat white; rest of under parts white, sometimes tinged with grey. Length 11·5 in.; wing 8·7 in.
BULWER’S PETREL
Bulweria bulweri (Jardine and Selby)
This small Petrel is a common resident in the Canaries and neighbouring islands, but only one individual has straggled to our shores.
The plumage is of a uniform sooty brown; tail wedge-shaped. Bill black. Legs reddish brown. Length 11 in.; wing 8 in.