On May 16, 1916, they returned to this locality and found the birds nesting in the same tree in a new hole “located three feet higher up and on the opposite side of the tree.” The nest contained three newly hatched young and one unhatched egg. Another visit was made the following year, on May 5, but the woodpeckers “had abandoned the lake and were making their home in a tree located in the channel of a small stream which flowed into the lake and about three hundred yards from their former site. The nest was found to be about half completed. Visits were made to it on several occasions until May 26, but the birds were not seen again.” In 1918 they were more successful. There was practically no water in the lake; and, on May 2, a search was “made through the aspen grove which in former years had stood in its entirety in from two to seven or eight feet of water, with the result that Mr. Flickinger discovered a fresh hole forty feet up in a live aspen growing close to the lake shore.” The nest had been completed, but no eggs had been laid. Returning on May 12, they collected a set of four fresh eggs. They say: The nest cavity was eighteen inches deep by about six in diameter, while the entrance was nearly four inches across. The nest was visited again on June 1 by both of us, and to our surprise we found that the birds had used the same cavity for a second set of eggs, four in number, which were three-quarters incubated. The short time intervening between the two sets shows that the birds did not lose any time after their first set was lost to them. The locality was again visited on June 30 and we found that the birds had finished another cavity about two hundred feet from the first tree and apparently the female was brooding a third set. We did not disturb the bird and hope that she successfully raised her brood. Inasmuch as the lake contained no water at this point we made a careful search of the upper end of the basin with the result that twenty cavities in all were located in various trees in what is usually the lake or very close to its shores. Most of these cavities were in live aspens. Apparently this pair of birds has nested here for a great many years, for although we have carefully worked the surrounding country for miles in every direction we have never discovered other birds or their cavities. _Eggs._--The western pileated woodpecker apparently lays either three or four eggs; I have no record of five. The eggs are indistinguishable from those of the northern pileated woodpecker. The measurements of two eggs in the P. B. Philipp collection are 30.9 by 23 and 29.6 by 22.9 millimeters. W. L. Dawson (1923) gives the average measurement as 32.5 by 24.1 millimeters. _Young._--Mrs. Irene G. Wheelock (1904) gives the following interesting account of the young: