_Nesting._--The nesting habits of this woodpecker do not differ materially from those of its eastern relative. Bendire (1895) mentions two sets of eggs, collected by MacFarlane in the Anderson River region, of which he says: “A single egg, originally from a set of three taken on May 30, 1863, accompanied by the female bird, was taken from a cavity in a pine tree, 4 feet from the ground, and another set of four, of which there are three eggs remaining, and likewise accompanied by the male bird, was taken on June 5, 1864, from a hole in a dry spruce, situated about 6 feet from the ground. The eggs from the last set were said to have been lying on the decayed dust of the tree, and were perfectly fresh when found.” Laing and Taverner (1929) found an abandoned nest in the Chitina River region, Alaska, of which they say: “Tree, about 15 inches in diameter at butt, had a dead top and nest in this dead portion, about 40 feet aloft. Dimensions as follows: diameter of door barely 2 inches; depth of nest 9½ inches; greatest diameter 3 inches. Barrel of nest quite cylindrical.” There is a set of four eggs in my collection, taken by Richard C. Harlow near Belvedere, Alberta, on May 29, 1926. The nest was about 20 feet above ground in a dead tamarack stub, among a scattered growth of tamaracks, in a muskeg, near a lake; the eggs lay on a bed of chips 10 inches below the entrance. Mr. Munro (1919) writes: “On May 28, 1917, I found a nest that had just been finished, thirty feet from the ground in a dead Murray pine. The entrance was smaller than would be expected, slightly over one and a half inches, and the hole about fourteen inches deep.” _Eggs._--The eggs of the Alaska three-toed woodpecker are indistinguishable from those of the eastern race. The measurements of 12 eggs average 22.08 by 17.09 millimeters; the eggs showing the four extremes measure =23.6= by =18.1=, =20.8= by 16.8, and 21.5 by =16.5= millimeters. _Behavior._--The plumages, feeding habits, and general behavior of this race do not differ materially from those of the species elsewhere, but Maj. Allan Brooks (Dawson and Bowles, 1909) has given a good description of a habit that seems to be shared by both species of _Picoïdes_ and that has been referred to by others; he writes: