Pipilo fuscus 19. 8 mi NE of Chalchicomula, 10,350 ft., Puebla, Mex. July 12, 1946 and with deeper cinnamon under tail - coverts than the birds collected from Rio Tria to Lerote. From the air, the distribution of these birds would resemble the following pattern: -- The cross-hatched areas represent mountain chains peaks. The towhees are found in the finger-like projections of arid, desert like, semi-desert like, and cultivated areas between the mountains. Certainly the population on the eastern plateau is sub-continuous, & undoubtedly represents one race. There may be a clinal trend of certain characters, and a worker study- ing birds at one end of the clime, as Soderber did when working on the birds of Vera Cruz, might doubt that his birds were fuscusine, but if such a clime exists, it would be so even and devoid of sharp breaks that the naming of additional races from the eastern plateau edge would be unwarranted.