Lipilo fuscus 18. Chalchicomula, Puebla, Mex. July 11, 1946 have apparently invaded the area cleared for cultivation, sticking to the shrub hedgerows, mostly Baccharis. This is the same situation noted around Tachuca, Perote, & Las Vegas. 8 mi. NE of Chalchicomula, 10,350 ft. Puebla Hwy. to El Seco, Puebla, Mex. July 12, 1946 The first P. fuscus seen after leaving our locality 8 mi. W of Chalchicomula, 10,350 ft., was at 9600 feet. They were observed commonly all the way to Chal-chicomula, and all the way from Chalchicomula to El Seco (San Salvador El Seco), a distance of 19 miles. The country between Chalchicomula and El Seco is farmland, with the usual maguey & shrub hedgerows. The junction of the Chalchicomula-El Seco road with C.N. No 2 at El Seco brings us back to the population of Towhees previously observed as far east as Las Vegas. In short, we have a continuous population all the way from Rio Frio, to the edge of the plateau to the east. This population is cut off from the Valley of Mexico by the high, coniferous mountains rising to 10,000 ft or more on the eastern side of the Valley of Mexico. There is a possibility that the Valley of Mexico population gets on the eastern plateau around Tachuca, as the 2 birds collected at Zergo are shorter-winged, darker dorsally,