Tampico, Tampico, Mexico to Valles, San Luis Potosi, Mexico June 27, 1946 45 mi. South of C. Victoria, between La Gloria and Ja- leana, altitude 1200 feet, the heavy tropical forest begins. We stopped at a point 46 mi. South of C. Victoria, ele- vation 1150 feet and noted: - Oriolia leucola (1 pair in a tree), Altho Mira Oriole, Groove-billed Ani, Tyrannus melancholicus. At least 5 Tinamous were heard whistling from the heavy undercover beside the road. 49 mi. S. of C. Victoria a O Red- eyed Cowbird, with expanded ruff, was seen hovering above a?, presumably in some sort of nuptial flight. 51 mi. South of C. Victoria, elevation 500 feet, the dense palm bottoms were first seen from the road. 69 mi. South of C. Victoria, 400 feet elevation, we hit a Mockingbird. Examination of the bird showed the plumage to be badly worn. 7 mi. South of C. Victoria, there were extensive sugar cane fields on both sides of the road. At this point several Sturnella magna were heard singing. Darkness fell shortly afterwards, and we proceeded to the Palm Courts in Valles without further observations. Valles, San Luis Potosi, Mexico to Mexico, D. F. June 28, 1946 Stopped at a point 5 miles South of Valles, eleva- tion 250 feet. Dense deciduous vegetation and galmetto scrubby roadside. Birds noted at this point: - Ground Flycatcher, Yellow-green Vireo,