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soon after leaving Aguas Calientes and think that small jumpers also occur. Guadalupe Zacatecas. This is a large town on the southern slope of the hills at Zacatecas and is a good point from which to work this locality. Nearby are some of the highest hills of the divide. A short distance above the town I saw signs of Thomomys ? on the upper side of the R.R. Calera, I think Thomomys occur near here. There are places of which one could