Pipilo fuscus 9. Mexico, D.F. to 5 mi E of Perote, 8700 ft, Veracruz, Mex. July 6, 1946 On the way east from Mexico, D.F., towards Puebla on C.N. No 2, Brown Towhees were seen fairly commonly to an altitude of 7600 ft, although habitat seemed favorable to a greater height. Oaks started along the road at 8200 ft, and pines at 8600 ft. About 28 miles east of Mexico, D.F., elevation 9300 ft, the pines are larger and the pine forests heavier. 32 miles east of Mexico, D.F., 9600 ft, the pine forest is quite heavy. The crest of the range is reached at 10,400 ft on this road. These high, pine-topped mountains must form an insurmountable barrier to P. f. fuscus of the Valley of Mexico, separating them from P. f. potosinus of the eastern plateau. 8 mi. east of Rio Tinto in Puebla, a P. fuscus was noted by the roadside, at 8200 ft elevation. The bird was collected as it foraged at the base of a road cut. Surrounding terrain was open pine country, with scattered maguey and corn fields, and some junipers. For the next 64 miles, not more than 1 or 2 Brown Towhees were noted. Most of the country traversed was flat farmland, and the principal crop is corn. It is possible that P. fuscus needs permanent vegetation, and that since the cornfields are annual, it does not find the correct ecologic niche about them. Maguey fields would provide good cover, as they are not annual.