LIFE HISTORIES OF NORTH AMERICAN DIVING BIRDS. 1438 
and thus fall well within the limits of the measurements of the eggs 
of both Aypolewcus and craveri. 
There is an egg in the collection of Mr. Charles E. Doe which is 
said to be of this species and it looks as if it might be correctly; 
identified. It was taken by Mr. A. H. Dunham, of Nome, Alaska, 
on June 10, 1904. The egg was found on rocky land above the Iron 
River about 70 miles north of Nome; the parent birds were also 
taken. In general appearance it much resembles the egg taken by 
Mr. Cantwell. In shape it is “elliptical ovate.” The color is “mas- 
sicot yellow ” and it is uniformly, but not thickly, covered with small 
spots of “bone brown” and “deep quaker drab.” It measures 60.5 
by 37.5 millimeters. 
Plumages.—Even less is known about the downy young; for, so 
far as I know, no specimen has ever been taken. In the juvenal 
plumage the young bird is pure, clear, “blackish brown” above, 
except for the white on the scapulars, and ‘the under parts are finely 
barred with dusky. The dusky barring on the under parts disap- 
pears during the fall and winter; usually by the end of November 
the under parts are pure white, as in the adult, but sometimes traces 
of the barring remain until February. Young birds can hardly be 
distinguished from adults during the first winter, but they have 
blacker backs, without so much plumbeous. This first winter plum- 
age is worn without much change throughout the first spring or until 
the first postnuptial molt, when young birds become indistinguish- 
able from adults in the winter plumage. 
Adults have two conspicuous seasonal molts producing strikingly 
different plumages. The prenuptial molt, which includes every- 
thing but the wings and tail, sometimes begins early in February, 
but more often not until March or April; it is often well along in 
May before the beautiful, marbled plumage of the spring adult is 
completed. The postnuptial molt is complete. It occurs mainly in 
September and October, but it is often prolonged into November; 
during this molt the heavier, dark, crescentic markings on the under 
parts, which are the last of the spring plumage to disappear, will 
serve to distinguish adults from young birds. By the latter part of 
November, at the latest, adults are in their full winter plumage and 
can be distinguished from young birds by having pure white under 
parts and more plumbeous on the upper parts. 
Food.—The food of the marbled murrelet seems to consist largely 
of fish which it obtains by diving in the tide rips and other places 
where it can find small fry swimming in schools. Doctor Grinnell 
(1910) writes: 
At the head of Cordova Bay a dozen or so were observed; one shot, dis- 
gorged fishes 3 inches in length. 
