_Eggs._--The Aleutian sandpiper almost invariably lays four eggs, although five have been found. These are ovate pyriform in shape and have a slight gloss. The ground color is "olive buff" or "deep olive buff." They are heavily, boldly, and irregularly blotched, chiefly about the larger end, with a few scattering smaller spots. The markings are in dark browns, "chestnut brown," "burnt umber," and "seal brown," varying with the thickness of the pigment. There are underlying blotches of "brownish drab," producing very handsome eggs. They can not always be distinguished with certainty from eggs of the Pribilof sandpiper, as they vary greatly in size; they average smaller, but the measurements overlap widely. The measurements of 50 eggs average 38 by 26.6 millimeters; the eggs showing the four extremes measure =43.2= by 26.8, 39.4 by =28=, =35= by 26.3, and 37.3 by =24.1= millimeters. _Young._--Incubation is apparently performed by both sexes, and both assist in the care of the young. The birds that I flushed from my two nests, one with eggs and one with young, both proved to be males. Mr. Turner (1886) says: The males are much devoted to their mates while incubating, and I have every reason to believe that the male does the greater part of the labor of incubating, as they were the ones generally found either on or near the nests. When alighting near the nest either sex has the habit of raising its wings perpendicularly and slowly folding them, all the while uttering a trilling peep, continued for several seconds. The parents are very devoted to their young, employing the usual tactics to divert the attention of the intruder, stumbling and fluttering over the ground, as if both legs and wings were broken. The young leave the nest as soon as they are strong enough to run, but remain with their parents until they are fully fledged in their first winter or juvenal plumage and ready to fly in August. _Plumages._--The downy young Aleutian resembles, in color pattern, the young purple sandpiper, but can easily be recognized by its warmer and richer browns. The upper half of the head is "warm buff," shading off to "pale buff" on the lores and cheeks and to pure white on the throat and neck. A median black stripe is broad on the crown, tapering to a point at the bill; loral and malar black stripes converge at the bill; the rest of the upper head is spotted or striped with black. The nape is a mixture of dull buff and dusky. The back, wings, and thighs are variegated with black, "ochraceous tawny" and "warm buff," everywhere sprinkled with conspicuous dots, terminal tufts, of buffy white in an irregular pattern; there is a more or less well-defined black patch in the center of the back, varying in different individuals, centrally veiled with "burnt sienna" tips. The entire under parts are pure white.