Nuevo Laredo, Tamaulipas, Mexico, to Valls, San Luis Potosi, Mexico June 27, 1946 18 mi. South of Monterrey, elevation 1500 feet. It is a small stream bordered by Taphrium rham - ncratum and some deciduous trees (sycamores, walnuts, etc.). Birds noted here: Sulfur- bellied Flycatchers building a nest, Hooded Ori- ole, Boat-tailed Grackle (including 1? with insect in bill), Bewick's Wren, Black Phoebes (2), Yellow-billed Cuckoo (1), and Vireo sp. (pro- bably flavoviridis) feeding young. 25 miles South of Monterrey some oaks were noted near the edge of the road. At this point the Eastern range (spur of Sierra Madre Oriental) begins todropout, whereas the main mountain mass to the West of the road is still high and rugged, with cloud-topped peaks. The country South of Monterrey is agricultural, with orange groves and pear orchards pre- dominating. The arroyos support a heavy tree growth, mostly Salinity Cypress. 45 miles South of Monterrey noted a Green-backed Goldfinch. 113 mi South of Monterrey at Km marker 799 noted Brown Jay flying across the road. At Km marker 799 (130 miles South of Monterrey) noted White-fronted Dove. Road- side vegetation still a mesquite association. At Kilometer marker 728, 158 miles South of Mon-