W. Reina 1953 Journal 1 July - 5 July Mexico: Pihuacuara. 7 mi. S W El Vergel (=lagunita) 7800'. abundant. Otherwise animals were notably lacking in spite of plenty of water, trees, talus slides and sand banks. On 5 July we drove back to Parral over the same route as we entered the mountains. Most of the way the ground had been rained on at least some and at El Vergel and a few other spots near the 2 largest barrancas heavy rain (including hail) fell while we were driving out. Except for a few places where the road traverses flattish meadow land it is probably traversable in all weather because of the rocky substrate. The night of the 5th we slept again at the Bryano in Parral. 6 July Mexico: Durango Most of this day and evening spent in driving south to Durango City from Parral. Short collecting stops were made at Rio Florida and Rio Nazas where Thamnophis aquae and melanogaster and Crenidophorus sachei, Sceloporus undulatus, Holbrookia texana, and Pitrophis catenifer collected respectively. During the evening - partially during and following a rain storm - we drove further