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During the course of a biosystematic study of the Peregrine Falcon (Falco peregrinus) by White over the past few years, observations have been made on several species of North American falcons. While all three large species (Prairie Falcon, Falco mexicanus; Gyrfalcon, Falco rusticolus; and Peregrine) have been subjected to detailed study by various writers, a few additional notes on their biology are reported herein. We would like to acknowledge the help in the field of William Tilton, Anchorage, Alaska, and the late Gary D. Lloyd of the University of Utah for stimulating discussions of the data presented. Marvin R. Meyer, of Salt Lake City, provided some data on Prairie Falcons.

The 14 nesting records of the Kittlitz's Murrelet (Brachyramphus brevirostris) in Alaska were summarized by Day, Oakley, and Barnard (Condor 85:265-273, 1983). Here we give the details of a nest record that they reported as the "Chukchi Sea" record. On 28 June 1978, two geologists, P. Metz and M. Robinson of Fairbanks, discovered the nest of an unidentified bird in the De Long Mountains (68*04'20"N, 162050'00"W, see Fig. 1). We visited the site on 29 June 1978 and identified the adult as a Kittlitz's Murrelet (Fig. 2). The murrelet did not flush until we were within a few meters of the nest-site. It had been incubating a single egg that measured 39 x 58 mm. We departed several minutes later, and the adult returned to the nest as we withdrew. The nest-site was located about 300 m above sea-level on a north-facing barite talus slope, devoid of vegetative cover. The nest was simply a slight, relatively flat depression in the talus slope (see Fig. 2). Linear distance to the nearest stream was 200-250 m. The nest-site was 75 km (straight-line distance) from the coast, indicating a minimum round-trip distance of 150 km to foraging areas for adults. This nest-site is considerably farther inland than others previously reported (ranging from 0.25 km to 30