70 NORTH AMERICAN FAUNA. [n".19 



64. Squatarola squatarola. Black-bellied Plover. 



At the Aphoon mouth of the Yukon I saw a flock August 28. 

 Osgood saw three young- which had been shot on the mainland near 

 St. Michael September 10, and from this date to the end of our stay 

 we saw occasionally one or two birds of the year, one of which was 

 taken September 16. 



65. Charadrius dominious fulvus. Pacific Golden Plover. 



None were seen until September 16, after which young ])irds became 

 fairly common on the boggy tundra about St. Michael and the murl 

 flats along the shore. The only adult seen was taken by Osgood Sep- 

 tember 25. We saw a number of young birds on St. George Island 

 October 3, and Osgood secured one. Crossing Bering Sea we saw some 

 near Unalaska October 4, and I saw one on October 8, when we were 

 several hundred miles south of the Aleutian Islands. This bird flew 

 several times aroiuid the Corxoin., answering my ever}' whistle, and 

 seemed anxious to alight. The specimens collected difi^er greatly in the 

 amount of the golden coloring, but all are far more golden than Massa- 

 chusetts skins of (lominicus^ and all have the shorter wings oi fulvus. 

 Irides, vandyke brown; bill and nails, black; tarsi and toes, slate 

 gray. 



66. .ffigialitis semipalmata. Semipalmated Plover. 



Osgood collected a male at Caribou Crossing June 24. and a pair of 

 adults and one pipped Qgg at the southern end of Lake jViarsh Juh' 

 2. I removed the young bird from the shell, and within half an hour 

 the down was almost dry, the eyes were open, and it could hop about 

 on its 'knees.' Maddren took another adult at this place .July 6, and 

 1 a female and four eggs nearly hatched, on the west shore of Lake 

 Marsh on the same day. The nest was a hollow, lined with a few 

 grasses and dead leaves, and was situated about 8 feet from the water 

 in the drift debris among the stones of the beach. We saw three or 

 four on a sand flat near Charlie Village August 10; a few about 15 

 miles above Circle August 12, and the last at Circle August 15. 



Bare pectoral spaces showed that both sexes assist in inculmtion. 

 Natal plumage: Lower parts, white, separated by broad bare space on 

 neck, changing to cream color on lower tail coverts. Above, cream 

 color, mottled with black, changing to ])ufl' on wings and tail. Fore- 

 head and infraorbital patches, cream color: broad band on neck 

 encircling head, white, bordered above by narrow band of black 

 extending from bill around occiput, and connecting in malar region 

 with ])lack line leading to inner canthus of ey^e. Spot on forehead, on 

 sides of chest at lower border of bare space, on sides and on flanks, 

 black. Irides, dark; bill and nails, black; tarsi and toes, slate color, 

 whitish posteriorly. 



