Valles, San Luis Potosi, Mexico to Mexico, D.7. June 28, 1946 Yellow-billed cuckoo (heard), Tinamou (heard), Brown jay, Couch Kingbird, Green Kingfisher (near a small stream), Myiozetes Acalana, American Egret, Hooded Oriole, and Green Jay. The yellow-green Vireo is a very active bird, and seems to move very rapidly, Warbler fashion, through the trees. Its song is similar to that of the Red-eyed Vireo, but the separate phrases are given much more ra- pidly. The note of the Couch Kingbird is a harsh, drawled "Trrrr." Also noted at this point was a large Tinamus with bright rufous under- parts, in a tree 7mi. South of Valles we noted our first Blue-black Grassquit and Sharp Seed- eaters, and heard a yellow-green Vireo singing. This Vireo is quite common, and can be heard singing by the roadside at frequent intervals. 10 miles south of Valles, we ran into heavy fog along the road. The fog belt lasted about 5 miles. 15 miles south of Valles an adult Giraud Flycatcher was seen feeding a young bird. 28 miles south of Valles we noted our first Tundus Grayi. It was perched on a telephone wire. 30 miles south of Valles a Saltator (Grandis?) was seen flying across the road. Blue-black Grassquits and Sharp Seed-eaters were common along this stretch. They were perched on the telephone