Seib, R. 1984 Acapulco, Guerrero, Mexico 12 Oct We had found a spot with hundreds of Eumolpoid bats and we prepared to net them at dusk. They begin flying when the sun disappears from view, but well before dark. We caught three and none of them had wing sacs, so we let them go and took down the net. While we were working Allison almost stepped on an Agkistrodon bilineatus. It was staying in a small pile of small rocks during the day, and emerged at dark. All day long we both stepped on these rocks going back and forth to the car. I watched the cautil for about 10 min. It moved up to the big boulders where the bats roosted and perched on a rock to the entrance of the roost. It sat there with its head elevated and seemed to be waiting for a bat to return. It was easy to imagine the snake following this route on a more-or-less daily basis. We left for the night drive way out of town and saw picked up five road-killed snakes (DOR), 3 Boa, 1 Leptodeira, and 1 Tumorophodon biscutatus. We saw no live snakes. Acapulco to Tehuantepec, Oaxaca, Mexico 13 Oct We spent the entire day and much of the night driving. Picked up a DOR Tumorophodon fimi E