The birds were found scattered out on the tundras whence they could be flushed from their nests or from where they had been feeding. One nest was a cup-shaped cavity slightly lined with grasses and sunk into the top of a hummock of moss surrounded by marshy ground. The two others found were similarly located except that they were embedded in clumps of grass, and mostly hidden from view by the surrounding blades. Each nest contained four eggs. One was fresh but the other two were considerably incubated. Prof. Wells W. Cooke (1912) made the statement that this species has two breeding areas "separated by nearly 1,500 miles of Arctic coast, from Point Barrow to the Boothia Peninsula," where "there seems to be no certain record of the occurrence of the red-backed sandpiper." This is far from true, for it is well known to breed there and eggs have been taken at many places along the Arctic coast. _Eggs._--Herbert W. Brandt (Mss.) describes his series of 120 eggs of this sandpiper very well, as follows: The four eggs of the red-backed sandpiper, which is their complement, are very handsome and show more variation than the eggs of most of the other shore birds breeding in the Hooper Bay region. In shape they are subpyriform to ovate pyriform and rest amid the leafy nest lining with the small ends together often so placed that the sitting bird during incubation touches only the larger ends. The shell is not as strong as many shore-bird eggs of the same size but they are not fragile by any means and they have considerable luster. As was true of many of the limicoline eggs found along that Bering Sea coast, there were two general types of ground color--the one, the greenish, that predominated by a ratio of about 15 to 1--and the other was the brownish type. The ground color ranges from "pale glaucous green"--that is the most common type--to "glaucous green," while the brownish-tinged eggs shade from "olive buff" to "dark olive buff." The surface markings are conspicuous and vary greatly, for on some types the spots are small and well scattered over the eggs; on others they are large, irregular, and bold; while on still other specimens they are confluent on the larger end and form a blotch that completely decorates that part of the egg.