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88 THE CONDOR Vol. XVII nest was found July 11 a few rods away, also in a mesquite, and seven feet from the ground. This nest contained four eggs partly incubated, of which one hatched July 20, the others on the three succeeding days. This would indi- cate that the bird starts incubating with the first egg. The mother was very anxious about the eggs, and ra? around close to me in a mammalian sort of way, flat on the ground, tail dragging, and head stretched out in front only about three inches from the soil. She did not look like a bird at all, and though making no fluttering demonstration, her antics were calculated to excite curi- osity and' distract attention from the nest. This nest may have been the second set of the owners of the first one found. Chorderies acutipennis texensis. Texas Nighthawk. A pair of these birds was flushed in a certain location each trip I made, but no nest could be found. The place was not favorable for finding the eggs, and I firmly believe the birds were nesting there. Tyrannus verticalis. Western Kingbird. A nest with two eggs in top of mesquite about fifteen feet from the ground. Another with three eggs in young cottonwood tree only eighteen feet from our back door. The location, in the forks of the tree about eleven feet from the ground, was not favorable for nest-building and the wind kept blowing it down until I fastened a few wires for a support. Then a Bendire Thrasher came and tried to take the site away from the Kingbirds. The Thrasher would bring some nesting material, and settle down in the nest. Then the Kingbirds would appear, scolding and trying to drive her away. As long as they kept flying at her she stayed on the nest, but if one came close and alighted she would fluff out her feathers and make a vicious dive at him, or her, as it might be. Had her mate been as much on the job the Kingbirds would have lost out, but he sang and did noth- ing else, so she finally gave it up, and the Kingbirds raised three young. Molothrus ater obscurus. Dwarf Cowbird. Two eggs found in the nest of a Plumbeous Gnatcatcher in a Zizyphus bush. Many of the Cowbirds stayed in the barnyard and ate watermelon in our back yard, but they had to search farther afield for more Gnatcatcher's nests. Agelaius phoeniceus sonoriensis. Sonora Red-winged Blackbird. A pair built a nest in a clump of mesquites at the edge of an alfalfa field, but deserted it, probably to join a small colony nesting in some willows along an irrigating ditch abou.t a quarter of a mile distant. Icterus bullocki. Bullock Oriole. One nested in a young cottonwood near the house and raised four young. Another had a nest with three eggs about nine feet up in a Zizyphus shrub. Two others were in mesquite trees, eight and fifteen feet from the ground, respectively, and contained four eggs each. Piprio aberti. Abert Towhee. Eight nests found, with two and three eggs to the set. Three nests were in mesquites, two in Dondia bushes, two in Zizy- phus shrubs, and one in an umbrella tree. The average height from the ground was five and one half feet. One nest was empty, with a blacksnake coiled round it, and the birds in distress nearby. I tried to secure the snake in order to determine how many eggs or young the nest had contained, but he escaped. The latest date was July 23, when three eggs partly incubated were found. This late set may have been a second one. Cardinalis cardinalis superbus. Arizona Cardinal. A Cardinal raised three young in a mesquite in the dense growth already described, and later, July 1, built another nest and started incubating on two eggs. I watched to