King, Warren B. 194 Haleakala Crater, Maui me next to it, the two being separated by two gulches and a ridge. Climb ed maybe 500 feet up, probably to above 7000 feet, where Larry discovered four burrows at the bottom of a sheer cliff face, one of which he dug into and discovered a Dark-rumped Petrel incubating an egg. We headed for cabin in gle, where the egg was blown. The embryo was formed but small; the egg was probably five to seven days old. The white was very viscous. Egg was white, larger than hen's egg, and more elliptical. Bird photographed after tying a string to its leg so it couldn't fly away. Bird then skinned by Larry. σ, testes 8 mm. Larry left cabin at 30 for banding siege on the cliffs, while Dave and I planned a population check along the ridge south of the cabin. Dave and I hiked 2 miles or so along the crater floor, then swung up onto a shoulder, climbing 1000 feet at least to about 9000 feet where we found three burrows at the base of a cliff and one lower on the shoulder. One of the three burrows contained a bird during the day, probably incubating, and the other two burrows looked new. Larry found one more bird which he banded, as well as ten or fifteen more unoccupied burrows. The birds are probably just beginning to lay since most of the burrows are empty but show signs of recent use. The burrows are 8 inches in diameter, oval in shape and from 4 to 7 feet deep, depending upon the amount of available soil. Burrows run roughly horizontal until last 2 feet which drop steeply to chamber at end. On our return trip to the cabin Dave and I heard birds all along the ridge, increasing as we approached the cabin. Since the birds should be settling down by the time we got back to the cabin it indicates that the greatest population density is near Holua cabin.