R.D. Hamilton 1965 Calcorius lapponicus June 19 Birds were observed in pairs scottland about th. tundra. Much singing and display were heard. I checked a nest that Paul had found earlier. It contained two eggs. A third egg was present about one ft. from the nest. June 20 Birds were in pairs. The nest checked yesterday was checked again. It contained a lemming and no eggs. Much singing and displaying were observed. June 21 Paired birds were observed scattered about. A nest was found about 30 yds. S at the one described previously. It contained 5 warm eggs and was located under an overhanging ledge. The noise made by the disturbed female called my attention to the nest. Th. nest consists of a little cup of grass with the inside of the cup about 3 inches across and 1.5 inches deep. It is lined with feathers. Some of the feathers seem to be Longspur feathers and some Snowy Owl feathers. Much singing and flight songs were observed. The other nest seems to have been abandoned. June 22 The birds were observed singing and displaying around th. tundra. June 23. The birds were observed singing and displaying around the tundra. Th. nest found on the 21st. was checked and was empty. There was a whole through it and it appeared that it was destroyed by a lemming. Another nest cup was found on the ground about 70 yds E of other nests. It contained no eggs. It was marked.