The water of Seventh Lake, Fulton Chain, had been raised by a dam at the foot of Sixth Lake, flooding a considerable area along the inlet, and the trees killed by the overflow stood in about 6 feet of water. In 1883 the place was first visited by me, May 27. Both species of Three-toed Woodpeckers (_Picoides americanus_ and _arcticus_) were tolerably common, and one new nest of each was found. That of _P. arcticus_ contained one fresh egg. The nest was 10 inches deep, and the opening within 5 feet of the surface of the water. It was in a dead spruce, 10 inches in diameter. * * * The place was next visited, June 2, but the date proved still too early. Several unfinished nests of _P. americanus_ were found, and one completed nest with four fresh eggs of _P. arcticus_. Like the one found on my first visit, it was in a dead spruce and about 5 feet above the water. The nest was 11 inches deep and the orifice 1¾ inches in diameter. J. H. Fleming (1901) says that the Arctic three-toed woodpecker is “a common resident in Parry Sound, rarer in Muskoka. This Woodpecker has a habit of sometimes nesting in colonies. I saw the nests of such a colony near Sand Lake in 1896; there were six or seven nests, each cut into the trunk of a living cedar, just below the first branch, and usually eight or ten feet from the ground. The cedars were in a dense forest, overlooking a small stream that empties into Sand Lake.” Macoun (1909) reports, on the authority of Spreadborough, that “a pair nested in a telegraph pole quite near Cache lake station of the Parry Sound railway.” Major Bendire (1895) writes: