_Field marks._--In winter the Pribilof sandpiper looks much like the purple sandpiper; it frequents similar haunts and has much the same habits. But its summer plumage, with its rufous upper parts and mottled under parts, is strikingly different. It resembles the Aleutian sandpiper in all plumages, but it is decidedly larger and, in summer, its upper parts are lighter rufous and there is more white in the under parts. _Fall._--According to Preble and McAtee (1923): About the middle of July, when the nesting birds are freed from family cares, they begin to resort to the beaches to feed, and at night gather in flocks to roost on some favorite rocky point. Later the young join the adults and the flocks increase in size through August. About August 9 the birds began to be common about the beaches, the flocks there apparently being in excess of the number breeding on the islands, and in all probability, therefore, comprised in part of migrants from other breeding stations. They continued to be abundant until my departure on the last of August. The Pribilof sandpiper is too rare and beautiful to be treated as a game bird, but Mr. Hanna (1921) writes: The birds possess some economic importance to the natives of the Pribilofs, and they have occasionally been eaten in the officers' messes. Their habit of congregating in fairly compact flocks and their fearless unassuming nature make them easy targets. For this reason close watch should be kept of the numbers returning annually, and should any noticeable diminution take place strict prohibitive measures can and should be invoked. This is possible because the islands are under strict governmental control as regards all wild life. Because of its limited range it would not be a difficult matter to completely exterminate the species. Special protective measures at this time, however, are not believed to be essential because there is even less hunting now than there has been for fifty or more years. The introduction of livestock and reindeer for fresh food removes in large measure the necessity for shooting, and the native is ordinarily too indolent to hunt unless he has to do so for food. DISTRIBUTION _Range._--Known only from the islands in Bering Sea and the coast of Alaska. _Breeding range._--The Pribilof sandpiper breeds on the Pribilof Islands (St. Paul and St. George Islands) and north in Bering Sea to St. Matthew Island, Hall Island, and St. Lawrence Island. _Winter range._--The winter range is imperfectly known, but it has been taken in this season at Portage Bay, Alaska, and probably occupies much of the Alaskan coast southeastward to (rarely) the Lynn Canal. _Migration._--They have been noted in spring to arrive at St. Paul Island March 5; Nushagak, Alaska, April 1 to 14; St. George Island April 23; at St. Paul Island April 24; and Point Dall, Alaska, May 23.