+Passerculus sandwichensis anthinus+ Bonaparte: Savannah sparrow.--Specimens, 19: Kaolak, 160 deg.14'51", 69 deg.56'00", 178 ft., 12, Nos. 30770-30781 including 3 ad. males, 3 juv. males, 4 ad. females, 1 juv. female and 1 ad. female (?), July 21-23, 25, 26, 1951; Gavia Lake, 150 deg.00', 69 deg.35', 460 ft., 1, No. 31336, juv. male, August 22, 1952; Wahoo Lake, 146 deg.58', 69 deg.08', 2350 ft., 1, No. 31337, ad. male, July 5, 1952; Porcupine Lake, 146 deg.29'50", 68 deg.51'57", 3140 ft., 1, No. 31339, ad. female, July 13, 1952; Driftwood, Utukok River, 161 deg.12'10", 68 deg.53'47", 1200 ft., 1 (skin) No. 31338, male and 1, No. 31335, ad. female, August 29, 1952; Chandler Lake, 152 deg.45', 68 deg.12', 2900 ft., 2, Nos. 30768-30769, 1 ad. male and 1 juv. male, August 10, 15, 1951. Savannah sparrows were caught in traps in the following communities: damp meadow of sedges, Chandler Lake, August 10, 1951; among sedges bordering a lake, Wahoo Lake, July 5, 1952; damp to wet meadow of sedges, grasses, and hummocks of cotton-grass, Porcupine Lake, July 14, 1952; along the edge of a deeply incised stream running through a marsh, Porcupine Lake, July 16, 1952. At Kaolak (July 21, 1951) on a windy day the greater number of savannah sparrows were in protected valleys of willows along the creeks and not on the open tundra where they are normally found. In a two mile course along one creek there were 80 birds, whereas on the open tundra there were, in four miles, only 13 birds. Weights of 10 males and 10 females, shot in the period July 14-August 29, 1951, at several localities on the Arctic Slope were: male 20(17-24), female 18(16-20) grams. In an adult male, shot on July 22 at Kaolak, the testes were two mm long but in other males, shot in the period July 14-August 29, the testes averaged 1.2 mm. The ovaries of adult females for this same period also had receded to normal non-breeding size. Juveniles on July 13 at Porcupine Lake averaged 20 grams in weight; the shortest was 125 mm in total length and the largest 140 mm. Adults in this same period averaged 144 mm in total length. Two adult males collected on July 22 and 24, 1951, at Kaolak, were molting. +Spizella arborea ochracea+ Brewster: Tree sparrow.--Specimens, 10: Gavia Lake, N White Hills, 150 deg.00', 69 deg.35', 460 ft., 1, No. 31340, juv. male, August 22, 1952; 9/10 mi. N and 9/10 mi. W Umiat, 152 deg.10'58", 69 deg.22'53", 380 ft., 1, No. 31347, ad. female, July 1, 1952; Umiat, 152 deg.09'30", 69 deg.22'08", 352 ft., 1, No. 31341, ad. male, June 26, 1952; Wahoo Lake, 146 deg.58', 69 deg.08', 2350 ft., Nos. 31342-31343, ad. males, July 6, 8, 1952; Driftwood, Utukok River, 161 deg.12'10", 68 deg.53'47", 1200 ft., 2 (skins) Nos. 31345, ad. male, August 29, 1952, and 31346, ad. female, August 28, 1952, and 1, No. 31344, ad. male, August 28, 1952; Chandler Lake, 152 deg.45', 68 deg.12', 2900 ft., 2, Nos. 30783, juv. male, 30784, a juv. of unknown sex, August 19, 1951.