Pearson - 1991 and Las Lenas turnoff were "mima" mounds of Ephedra, rather nicely spaced, but looking more like the wind had blown away the soil between them. No tucos present. Also another set east of Sosneado, with a good layer of river stones underneath; no tucos. Stopped to admire the view at Cerro Chihuido, 20 km S. Malargue, and Anita found a snake (Amphisbaenid OP 7878) pinned under a rock in a rockslide. We stopped at a rather nice Museum in Malargue with a big Ichthyosaur and other local fossils. Also stopped at two caves visible from the road south of Malargue. Both had been excavated by archeologists; one even had scraps of their data sheets. That cave seems to have been called Cueva de da Luna. No animal amber in either of them, but one had a tuco skull. Camped in sandy/gravelly desert south of El Manzano. Anita put out 10 Shermans. Road was all paved except for about one hour. November 27,-El Manzano to Chos Malal. Nothing in Anita's 10 traps. Stopped at various lava caves and crevices. One cave a few km south of Ranquil Norte had a few droppings of viscacha and a smaller Cricetine? rodent. Nearby in a crevice was a handful of viscacha pellets mixed with vegetable fiber, cemented together but not with dark glossy "amber". Contained only viscacha droppings and vegetable fiber. The droppings can be separated out with forceps, but the mass is definitely "solid". Arrived at Chos Malal about 4 p.m. Crossed the two bridges across the Rio Caleufu and turned right upstream for 4.4 km looking for Budin's sand dunes "in the triangle between the Rios Caleufu and Neuquen". Then tried the road to Andocollo for about 5 km, but found no dunes, no tucos. Then went into town and asked around. Found two soldiers who said to go across the Caleufu and immediately after the bridge take the foottrail upstream, and we would surely find dunes and tunducos. We did so and passed numerous chacras but had to hike more than a km upstream before we came to some Larrea growing on top of sandy dunes. No fresh tuco sign, but I found a couple of old bocas that opened up into good tunnels. On the way back to the car parked at the bridge, a farmer working in his field told us that we could find tunducos if we went downstream to where the Monte was near the river (which is where we had just been). Back to Chos Malal to spend the night. November 28.- Chos Malal. Went back to the tuco place across the Rio Curileuvu from town and set 11 steel jumtraps in tuco burrows between 8:30 and 10:45 a.m. Saw no fresh sign, and heard none. All in sand dunes about 2 m high, held in place by big Larrea bushes and a yellow-flowered composite looking like rabbit brush. Then snooped around and checked the traps occasionally. Saw one hare. While we were checking traps at about 11 a.m., a real gauch0 rode past with dog. We told him that we were looking for tunducos. He said that the only tunducos were far away. Our next trap held a big