Replying to your query about the dowitcher, it is my opinion that this species does not breed in the interior of northern Ungava, but I admit I have nothing to prove it one way or the other. It seems to me, though, that if it did breed there, it would be far more common than it is at the southern end of James Bay in migration, instead of being one of the rarer kinds. I never saw it anywhere north of this part, but then I have not been in northern Ungava in the breeding season.
Turner's record of a single bird at Fort Chimo, on June 10, 1883, seems to be the only peg on which to hang the Ungava theory; and this may have been a straggler. The Alberta birds are somewhat intermediate; and probably typical griseus, if there is any such thing, will be found breeding somewhere in the muskeg regions of central Canada between Alberta and Hudson Bay.
There are several sets of dowitcher's eggs in collections, from this general region, collected in 1903 and 1906, which have been looked upon with some suspicion; one came from Hayes River Flat, 25 miles north of 55°, one from just south of Little Slave Lake, and three from Little Red Deer River, Alberta. Now that the dowitcher has been definitely shown to breed in Alberta, these records look authentic.
To A. D. Henderson and his guests is due all the credit for recent positive evidence. On June 18, 1924, he found a pair of dowitchers with two young, only a day or two old, "near a small lake in a muskeg about 17 miles northeast of Fort Assiniboine." The following season he found dowitchers again at three different places in the same region, "probably a dozen pairs in all"; and on June 2, about 35 miles northeast of Fort Assiniboine, he took his first set of three fresh eggs. The nest was "in a muskeg in open growth of small tamarac trees about 125 yards from a lake"; he describes it as "a hollow in a lump of moss, scantily lined with a few tamarac twigs, leaves, and fine dry grass, at the root of a small dead alder about 12 inches high"; it measured 13/4 inches deep and 4 inches across; the top was 4 inches above standing water.
Mr. Harlow, who was with Mr. Henderson the next year, 1926, took two sets of four eggs each. One "nest was in an extensive tundralike muskeg, very quaking and wet, and the nest was in a small bunch of dwarf birch, not over 12 inches high, on the end of a little ridge of moss and completely surrounded on three sides by water." The male was seen "singing" near the nest. He joined the female after she had fluttered off the nest and the pair were seen feeding together; several times they stood erect and rubbed their bills together. After the eggs were taken a set of phalarope's eggs was placed in the nest; the dowitcher returned took one look at the eggs and then flew away and was never seen near the nest again.
Eggs.—One of Mr. Henderson's sets was apparently complete with three eggs, but four is the usual number. There is probably no constant difference between the eggs of this and its long-billed relative. One of Mr. Harlow's sets he describes as "light olive-green, rather lightly marked with pin points, spots, flecks, and a few blotches of dark umber and dark brown." The other set, he says, is slightly darker olive-green and is "much more heavily spotted and blotched with small and large spots of umber and brown and under shell markings of a lighter color." The measurements of 18 Alberta eggs average 40.8 by 29.2 millimeters; the eggs showing the four extremes measure 44 by 29.5, 41 by 30.3, 38.2 by 28.5, and 38.7 by 27.7 millimeters.
Plumages.—The plumages and molts, which are the same in both forms, are fully described under the long-billed dowitcher.
Food.—The favorite feeding grounds of the dowitchers are the mud flats and sand flats in sheltered bays and estuaries, or the borders of shallow ponds on the marshes, where they associate freely with small plovers and sandpipers. Although not inclined to move about actively, their feeding motions are very rapid, as they probe in the mud or sand with quick, perpendicular strokes of their long bills, driving them in their full length again and again in rapid succession; while feeding in shallow water the whole head is frequently immersed and sometimes several strokes are made with the head under water. Dr. E. R. P. Janvrin writes to me:
Mr. J. T. Nichols and I watched three individuals feeding on the salt meadows late in the afternoon, continuing our observations until it was so dark that we could hardly distinguish the birds any longer; at which time the birds were still feeding. The question arose whether dowitchers might not be nocturnal in their feeding habits, as is the case with the woodcock and Wilson's snipe, since the sense of sight is certainly not essential to their probing for food.
Various observers have noted among the food items of the dowitcher grasshoppers, beetles, flies, maggots, marine worms, oyster worms, leeches, water bugs, fish eggs, small mollusks, seeds of aquatic plants, and the roots of eelgrass.