Pipilo fuscus Zinapan, Hidalgo, Mexico - Mexico, D.F. June 28, 1946 7600 feet, 2 P. fuscus noted. 36 mi. South of Actopan, 7600 feet, 5 P. fuscus noted. The country here is open and arid, with scattered maguey, tuna cactus, and mesquite. 44 miles south of Actopan, 7400 ft, 1 P. fuscus noted. 49 miles South of Actopan, 7400 feet, 1 P. fuscus noted. 54 mi. South of Actopan, 7400 ft, 2 Pipilo fuscus noted. As much as Brown Towhees were noted almost continuously from Zinapan nearly to Mexico, D.F., and since the country is much the same along their line of distribution, it would seem that the population radiating south from Mexico City is continuous. From Zinapan to the crest of the range enclosing the Valley of Mexico to the South there is a rise in elevation of only 1200 feet, and nowhere is the elevation change so abrupt that a barrier is formed. On the basis of roadside observations, Brown Towhees seem more common in the Valley of Mexico than between the crest of the Valley and Zinapan. However, the fact that it was later in the afternoon when the crest was mounted, and a better time for seeing birds, might account for this, and may explain the lack of Towhees ob- served north of Zinapan. Towhees were certainly more in evidence than any other bird from