Pearson - 1994 24 Ctenomys maulinus December 7- Drove from Paso Cordoba, where we caught what looks like haigii, to Chapelco, past Lago Meliquina. We looked for tuco diggings as we drove along the Villa Angostura-San Martin road but saw none. We stopped once, just before the turnoff to Chapelco where there is a big pasture above the road. I walked around in it and saw lots of tuco diggings None fresh, but surely tucos were present. There seemed to be a preference for digging at the base of the few scattered Berberis bushes. Heard none. We turned up the road to Chapelco and saw a few diggings along this road. The ski resort at Chapelco was completely closed down, but some maintenance people were working. One of them said there were no tucos there, that you had to go down to San Martin to find them. However, Anita and I walked up onto the nearest ski slope, turf grazed by cows, and found numerous fresh fresh diggings. So we set 10 steel traps on that slope, and 3 more near the soccer field north of the slopes. Finished setting about 3 p.m. While excavating for burrows in which to set traps, we uncovered rhizomes of bamboo, but there was no bamboo growing on the slopes. The Administradora said that they had to cut bamboo every year. The first slope was cut in the 1970s. She had never seen a tuco, but was familiar with its tunnels in the snow. See journal and catalog for details of trapping. At no time did we hear vocalizations. At 8 o'clock p.m., sun still up, there were 6 tucos in the traps. December 8- Chapelco. Three more tucos when we picked up the traps at 7 a.m. No two tucos from the same burrow. One dead tuco put into a bucket with a live one was immediately attacked and bitten. Three? females were late pregnant, none lactating. They must have gotten pregnant under the snow. One male had small testes; another had larger testes but sex accessories not very big and the epidimys tubule not clearly visible. Smeared it. [Abundant 'zoa, asymmetrical, many with broken tails]. The seminal vesicle was delicate and branched like a stag coral; the ?prostates were