At Driftwood (Aug. 30, 1952) an adult and two juveniles were feeding in a lake northeast of camp. +Polysticta stelleri+ (Pallas): Steller's eider.--Specimen, 1: Topagaruk, 155 deg.48', 70 deg.34', 10 ft., No. 30325, ad. female, July 10, 1951. An incubating female was shot at Topagaruk on July 10, 1951. Her ovary was 30 mm long, and the largest ovum was 3 mm in diameter. Her nest was in a depression of a high-centered polygon some 300 feet from any large body of water, contained five fresh eggs, and was lined with black down feathers of an adult. On each of three occasions when approached, the female left the nest when I was six feet away. On September 7, 1952, a flock of eight Steller's eiders was swimming in a large lake approximately one mile southeast of the Arctic Research Laboratory. +Somateria mollissima v. nigra+ Bonaparte: Common eider.--On August 25, 1952, approximately 100 yards southwest of Point Barrow, 30 Pacific eiders were resting on the beach in company with 90 king eiders. When approached some swam and others flew out onto the Arctic Ocean where they remained until we withdrew from the area, after which time the birds returned to their resting place on the beach. PLATE 9 [Illustration: Fig. 1. A male yellow-billed loon setting on eggs in nest at Wahoo Lake on July 9, 1952.] [Illustration: Fig. 2. Nest and eggs shown in figure 1, July 9, 1952. Incubation had just begun.] [Illustration: Fig. 3. Arctic loon (upper) and red-throated loon (lower) from Teshekpuk Lake, August 1, 1951.] [Illustration: Fig. 4. Nest and eggs of white-fronted goose at Umiat, July 1, 1952. Incubation three fourths completed.] [Illustration: Fig. 5. Adult male surf scoters, July 16, 1952, at Porcupine Lake. Scoters are uncommon on the Arctic Slope.] [Illustration: Fig. 6. Arctic tern shot at Teshekpuk Lake on August 1, 1951. A common breeding bird in northern Alaska.] PLATE 10 [Illustration: Fig. 1. Shore of Arctic Ocean at Point Barrow, June 19, 1952. Many birds already were nesting on the tundra.] [Illustration: Fig. 2. Tundra and oriented lakes 80 mi. S Point Barrow, August 28, 1952, are breeding places for water birds.] [Illustration: Fig. 3. Luxuriant vegetation used by breeding birds in intermontane valley at Porcupine Lake, July 18, 1952.] [Illustration: Fig. 4. Willow-lined creek at Chandler Lake, August 25, 1951. Willows and alders offer nesting sites for birds.] [Illustration: Fig. 5. NW face of Mt. Chamberlin, 9131 ft.; terrain inhospitable to most breeding birds. August 5, 1952.] [Illustration: Fig. 6. Destruction of bird communities by caribou trampling south of Lake Peters. August 8, 1952.] +Somateria spectabilis+ (Linnaeus): King eider.--Specimen 1: Point Barrow, 156 deg.27'25", 71 deg.23'11", 3 ft., No. 31306, ad. male, August 25, 1952.