R. Zweifel 1953 Amblystoma rosaceum migrum 6 mi WSW Las Adjuntas, 8500', Durango, Mexico 2375-6 RZ July 7 Near our campsite there is a hillside seep which feeds into three holes, the two large being 4' and 6' in diameter and 2' deep, which have evidently been dug to retain some water. A large larva and another nearly transformed were taken from these holes. As compared to the salamanders from 7 mi SW El Vergel, there are much darker. The increase in black tends to change the pattern from a mottled one to spotting. The light coloration is yellowish-white, rather than greenish yellow. July 10 In a spring hole 4' x 3' x 14" deep, temperature at mid-day 14.2°C. The hole is partially boarded over, and probably little or no direct sunlight reaches it. There is no algae present, whereas algae is thick in the pool described above (July 7) where several larvae have been taken. Today's larvae are different from those collected on previous days in being much darker; the yellow pigment is practically absent. There is a line of golden granules concentrated along the lateral line from gill to groin