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8 any of the several springs to be found on the mountain side. To date I have worked on the Ajusco side of the cañon, which is the south side, and therefore gets less sun each day. It is quite wet in places. The Pedregal, Feb. 25, P.M. This is an area of heavy and extensive lava flow, with enormous clinkers all over the place. It is very, very dry; I saw no water in the whole place. There are many cacti and a few live oaks, the latter chiefly in hillsides. Pepper trees are common, and a few pine are on a higher hillside. I spent 3 hours here, and saw one lizard, 3 times. There were many scorpions, pill bugs, black widows and other spiders, and a few earthworms under rocks. The Sceloporus was a collared form, probably fellariperezi, which I couldn't get close to. Black back and tail, with a hint of chevron markings. I saw nothing else there. Cañon Contreras, Feb. 25, later P.M. Returned here for another try at the neotenic salamanders Wagner says he has collected in the mountain streams here. I found no salamanders, but I did see salamander eggs, attached to the under side of a rock in a mountain pool. They were individually attached. Each was about 3/4 inch in diameter, including gelatin. The eggs, in the neurula stage, were about 1/4 inch in diameter, longer than broad. [[end page]] 9 [[start page]] Cañon Contreras, Feb. 26, A.M. Crossed the cañon to the other side, where the sun strikes in early morning, and shines all day. This is the North Bank, with a southern exposure, on the slope of San Miguel. This side is considerably drier than the other, with little or no water. There were no streams where I worked. There were a few oak trees, with yucca, cactus, and maguey on the slope. I found a Sceloporus under a rock on this slope, of the same species as those on the houses in the city. I have seen them in Chapultepec Park and at the Los Angeles Court. Pedregal, Feb. 26, P.M. Returned with a gun to try again for the single Scelop, but I couldn't even find him. The heat of the afternoon is intense, and the lizards probably do no sunning then. Got nothing. [[end page]]