Mycual Leng 1969 Journal 19 Papa Leon Tree, 150't ft., Depto. Lima, Peru July 5 (cont.) The reptilian representatives are all nocturnal. Last night we also saw many moths, some quite large (almost 2 in. long), by their eye shine among the pepper trees in the arroyos. Perhaps one of the keys to this is the apparent fact that the insects are nocturnal. Those in higher trophic levels must also be nocturnal, then. Mrs. Pearson dug up a Tropidurus-type lizard from a shallow hole about an inch wide. It came out of a back door about 6 inches away. It is very cold. It is common in a hot desert like the Sahara to have only nocturnal life, but this is a cold desert. The range of temperature was 54°-68° yesterday, but I think the temperature stayed pretty well somewhere in the middle of those extremes. Perhaps the Sunny season is really hot and the animals just remain adapted to activity at night. Further up the valley there is green vegetation. The military in the past has built stone corals here. No sign of mice. There are lots of snails, and their droppings can be seen everywhere. Scorpins are common. We saw a Red Snipe here. We are keeping the 2 live Phyllotis unicus in captivity a while, along with the 2 P. darwini. The darwini are much larger & have proportionally larger tails & ears. The unicus are very linear mouse-like and