remainder trownish black, as are also tLe primaries, the last having a small white spot upon both
webs midway of their length. Underparts pure white. Tail has four central rectrices brownish
black, remainder white, with black base and black bar neai- the tip; the outermost feather nearly
all white, with very little black at the base; the white is very much less on the sccond; and
on the third the black of the base extends upwards for more than half the length of the feather.
Iris yellow. Total length without bill 16 inches, wing 7, tail bill along gape tarsus 1.
There is no difference in the plumage of the sexes. Young birds often have very dark bills.