148 BULLETIN 107, UNITED STATES NATIONAL MUSEUM. 
be measured, but color and markings are the same as in the one last described. 
I have both the females from which these eggs were taken. 
Plumage—The downy young still remains unknown, and the 
sequence of plumages to maturity is not fully demonstrated by speci- 
mens, but from what we have seen it is fair to assume that the 
changes are similar to those of the closely related marbled murrelet. 
The adult has two seasonal molts similar to those of the preced- 
ing species. I have not seen enough specimens to work out the 
dates of the molts satisfactorily. Mr. Turner’s bird, collected April 
24, is still in full winter plumage, and so is a specimen in the United 
States National Museum, taken April 3, but possibly these may be 
young birds. The complete molt in the late summer or early fall 
produces a winter plumage entirely unlike the nuptial plumage and 
much like the winter plumage of the marbled murrelet; Kittlitz’s 
murrelet in this plumage may, however, be distinguished by its 
much smaller and shorter bill and by having much more white on 
the sides of the head and neck, which includes the lores, extends 
above the eyes, and forms a broad collar nearly around the neck, in- 
terrupted by only a narrow, median, dusky band. The prenuptial 
molt apparently involves all of the contour feathers, the scapulars, 
and perhaps some of the wing coverts. This produces the beauti- 
fully mottled nuptial plumage, which is worn through the spring 
and summer. Nearly all of the specimens in collections are in this 
plumage. 
Food.—The two statements included in the above quutations tell 
all that we know about the food of this species. Mr. Nelson (1887) 
remarked that it appeared to be “feeding upon small crustacea.” 
Doctor Grinnell (1909), in Mr. Dixon’s notes, states that the “ prin- 
cipal diet was a slippery, slug-like animal about an inch long.” 
Winter—Regarding the fall migration and the winter home of 
Kittlitz’s murrelet very little is known. It certainly does not mi- 
grate south along the American coast. The indications are that it is 
a bird of Asiatic origin, which has extended its summer range north- 
ward to the Arctic coast of Siberia and eastward through the Aleu- 
tian Islands to its Alaskan breeding range. If such is the case, it 
probably returns to spend the winter in the region from which it 
emanated, perhaps somewhere between the Commander Islands and 
the coast of Japan. 
DISTRIBUTION. 
Breeding range.—Presumably from the Aleutian Islands (Atkha, 
Amchitka, and Unalaska) east along the southern Alaskan coast to 
Glacier Bay. Has been taken in the Kurile Islands in summer and 
several. specimens at Indian Point, Siberia. Records of the marbled 
murrelet from Plover Bay and other points on the Siberian coast may 
