things and loaded trucks etc onto plateau in p.m. While the station master was making out the papers in his office a small bat flew in and was knocked down by one of my bystander (no. 3208). Day overcast, light sprinkles at dusk. Compared to our other campsites, Cerbatana has some lusher bottomland nearby, the thorn scrub is less abundant and less dense, the grass shorter and looking as though more closely grazed. The grass was faintly green, mostly brown. When we drove into town for the last time there was no water flowing in the Jajas. july 25 left on morning train for Castilla, then drove to Chuparal, part of the way across albull-grass plain very much like Harvard Pairways at 13,000 ft. on the altiplano. Spent the night in Chuparal. july 26 Shopping in Chuparal and much talking with various people about how to get to the bat caves of Tulum. Tried going out a road across the airport, a road that was said to take one to only 2 hours on foot from the caves. The road was just about passable but several long & steep hills of red clay would have marooned us for days in case of a single rain, so we drove back and made camp about 2 miles outside of Chuparal after arranging for going to the caves tomorrow. Camp is along a small stream bordered with rather broad-leaved trees- no spines. Most of the