P. M. Silloway (1901) found a nest of Audubon's warbler near Flathead Lake, Mont., that was 18 feet from the ground in a fork of a willow. "The fork containing the nest was in a main stem, upright, a number of feet below the leaf-bearing part of the tree, so that the nest was exposed quite fairly to view." H. D. Minot (1880) found one at Seven Lakes, Colo., in an odd situation: "The nest, composed of shreds and feathers, with a few twigs without and hairs within, was built in a dead, bare spruce, about twenty feet from the ground, compressed between the trunk and a piece of bark that was attached beneath and upheld above, where a bough ran through a knot-hole, so compressed that the hollow measures 2-1/4 x 1-3/4, and 1-1/2 inches deep." Dr. Chapman (1907) describes a nest from Estes Park, Colo., as "loosely constructed of weed-stems and tops, and strips of bark, lined with fine weeds and horse-hair." Mr. Woodbury (MS.) describes Utah nests as "compactly woven, cup-shaped structures, usually of fine grasses, plant fibers or shredded bark, lined with feathers or some substitute, and camouflaged with some fine stringy material holding bracts or other small particles in place." He reports nests in such conifers as spruce, balsam, and ponderosa pine, and in aspen and oak. J. Stuart Rowley writes to me: "In California, I have found several nests of this species in the San Bernardino Mountains and in the Mono County area in the northern part of the State. The nests I have found have all been beautifully made structures, securely fastened to small, low hanging branches of lodgepole pine, and placed about 10 to 12 feet from the ground." Dr. Grinnell (1908) records three nests, found in the San Bernardinos; one "was twenty feet above the ground in the thick foliage of a short drooping fir bough. It was compactly composed of weathered grasses, frayed-out plant fibres, and tail and wing feathers of juncos and other small birds. Internally it was thickly lined with mountain quail feathers, some of the chestnut-colored ones sticking above the rim conspicuously. This feather feature seems to be characteristic of Audubon warblers' nests, as it was noticeably present in all that we saw." Another nest was 25 feet from the ground in one of the lowest branches of a yellow pine. The third "was snugly tucked away in a small clump of mistletoe on an alder branch twelve feet above the ground." J. K. Jensen (1923) says of New Mexico nests: "The nests are usually placed on a horizontal limb of a pine or spruce, but also among dead twigs on the trunks of cottonwoods, and even in a cavity of some tree. All nests found were lined with a few feathers of Bluebirds and Long-crested Jay." Nests in tamarack, cedar, and birch have been reported by other collectors.