R. K. Sillandar, 1953 7 Feb. 5 15 mi. E El Rosario, 1200 ft., Baja California. (Dendroica sp.). Heard a flicker calling. Mockingbird seen in shrubs in bottom of arroyo. Examined two more cactus wren nests, both in opuntia cactus near road. One was unlined, the other thickly lined with quail feathers. Both about 4 feet above the ground. I am now camped under a large carlone cactus at the side of the road. A good wind is blowing up the canyon from the west. I believe this arroyo must be San Juan de Dios Canyon mentioned by Goldman ("Biol. Investigations in Mexico"). Feb. 6 Hunted around camp in the morning. Collected one cactus wren and a shrike. At noon I drove down to El Rosario, stopping to hunt in some willows just east of town. Heard song sparrowa singing there. Took a Dendroica scalaris. Saw a flicker. Horned larks abundant in the field around El Rosario. Noted a nest of a pair of red-tailed hawks placed in a ciro tree east of El Rosario. At El Rosario I talked to a Mrs. Espinoza at her store-gas station and started toward Ensenada at about 1:00 P.M. Had a flat tire 3 or 4 miles from El Rosario -- split the tire. 5 miles south of Socorro, 50 ft., I noticed a cactus wren perched on a telephone pole. Collected this bird. There are no cholla cactus in this vicinity, just low scrub and agaves.