They were nearly always associated with _maculata_, whose habits they shared to a great extent. When congregated about their feeding places they united into flocks of from ten into fifty, but single birds were frequently flushed from and they were rarely shy. On October 1, 1880, they were found scattered singly over the marsh, and arose 30 to 40 yards in advance, and made off with a twisting flight, uttering at the same time a short, soft, metallic _pleep, pleep,_ and pursuing an erratic, circuitous flight for a time they generally returned and settled near the spot whence they started. On the shore of Siberia, near North Cape, we found these birds very common, scattered over damp grass flats near the coast, the 1st of August, 1881. The ground was covered with reindeer tracks, and among these the sharp-tailed snipe were seen seeking their food. They were very unsuspicious and allowed us to pass close to them, or circled close about us. From their movements and other circumstances I judged that this district formed part of their breeding grounds, whence they reach the neighboring coast of Alaska in fall. _Field marks._--The sharp-tailed sandpiper most closely resembles the pectoral sandpiper, but it can often be recognized in the field by the more ruddy color of the upper parts. Most of the feathers of the shoulders, scapulars and secondaries are broadly edged with chestnut; these edgings are paler in winter. The bright chestnut crown, streaked with black, and the ruddy brown suffusion on the chest and sides, might be recognized under favorable circumstances. _Fall._--Not much seems to be known about the spring migration, but the fall migration is fairly well marked. Doctor Nelson (1887) says: They usually make their first appearance on the shore of Norton Sound the last of August, and in a few days become very common. They sometimes remain up to the 12th of October, and I have seen them searching for food along the tide line when the ground was covered with 2 inches of snow. When feeding along the edges of the tide-creeks they may almost be knocked over with a paddle, and when a flock is fired into it returns again and again. It is a regular fall migrant in the Pribilof Islands, between August 17 and November 9, where it associates in large flocks with the pectoral sandpiper on the seal-killing fields. Doctor Stejneger (1885) writes: Of this species I only obtained young specimens on Bering Island during the autumnal migration of 1882. From the middle of September and during the following three weeks they were observed both on the tundra near the great lake and on the rocky beach of the ocean searching for Gammarids. They were very shy and mostly single or in small families. Larger flocks were never seen.