256 BULLETIN 14 6, UNITED STATES NATIONAL MUSEUM. 



Plumages. — The young bird referred to above was about half 

 grown and largely feathered when it died, but the specimen shows 

 a little of the natal down, mainly on the head, which is largely 

 downy. The forehead is buffy white, the crown mostly dark " bister," 

 and the sides of the head are mottled with buffy and " bister " ; the 

 throat is pale buff. The remiges are half grown and the new feathers 

 of the mantle are " sepia," with " cinnamon-buff " tips ; the feathers 

 of the breast are " cinnamon buff " or " pinkish buff " and those of 

 the belly are white. 



Evidently the ju venal plumage soon fades, for a specimen taken 

 on September 22, in full juvenal plumage, is much i^aler. The entire 

 upper parts are " hair brown " or " drab," with narrow, pale, buff'y 

 edgings; the forehead and under parts are white, but the breast 

 is suffused with " pinkish buff " and invaded on the sides with the 

 " drab " of the upper parts. 



There is not sufficient material to show the molts and plumages 

 satisfactorily. Adults have a complete molt in August and Septem- 

 ber, at which the cinnamon of the chest, neck, and head entirely 

 disappears. 



Voice. — Doctor Stejneger (1885) says that " the call note is a clear, 

 penetrating dmTiit.'''' Mr. Jourdain adds : " The call note is de- 

 scribed by Whistler as a soft twip, and the alarm note as a sort of 

 chatter of two syllables coi^ up, not unlike the note of a frog and 

 compared by Osmaston to that of a nightjar. It is uttered usually 

 on the wing and also occasionally on the ground." 



DISTRIBUTION 



Range. — Eastern Asia and Oceanica; accidental in Alaska. 



Breeding range. — This race of the Mongolian plover breeds 

 chiefly in northeastern Siberia (Cape Serdze, Bering Island, Kam- 

 chatka, and the Commander Islands) ; probably also in Dauria and 

 Mongolia. 



Winter range. — The winter range includes the Philippine Islands, 

 the Moluccas, New Guinea, and northern Australia. 



Migration. — The species has been noted to arrive in spring at 

 Yokohama, Japan, on April 28, and at Bering Island, on May 11. 

 A late fall date on Bering Island is September 22. 



Casual records. — On June 11, 1925, an adult male was collected 

 at Cape Prince of Wales (Bailey). Two specimens were taken by 

 C. G. Harrold on Nunivak Island, Alaska, in 1927, one on August 

 14, and one on September 1; others were seen on August 14 and 

 September 11 and 13. These are the only North American records. 



Egg dates. — Bering Island, June 4. Siberia, June 9. 



