-130- feathers of throat white at base; belly and flanks white, with wedge-shaped stripes of dusky, producing a mottled appearance; tail feathers with white on inner webs for half their length; bill, legs and webs bluish black. This species is still very rare in collections; two individuals have been recorded in the last 80 years. Wing about 6\frac{1}{4} inches; tarsus about 1.4 inch. Oceanodroma fuliginosa. Tail more or less forked; sooty slate above (no white on upper tail-coverts), and sooty grayish brown below. Length of wing 7.5 inches. Tahiti is the type locality, where the bird has not been found since Cook's time, though birds from other places (Japan and Laysan) are supposed to be the same; some authori- ties, however, think the latter represent a different species (O. tristrami), and the question can not be settled until birds from Tahiti are in hand. Pelagodroma has broad flat claws, but the 1st primary is much shorter than the 3d. Fregetta. Has the basal phalanx of middle toe much flattened, and equal to or longer than the remaining joints and claw. F. albo- gularis is sooty black; upper tail-coverts short and white; throat and abdomen white; broad band on breast sooty; wing 8 inches. F. melanogaster has the upper surface, breast, and middle of abdomen sooty black; flanks, upper tail-coverts and under wing-coverts white. Wing 7 inches.