Pearson - 1993 16 Altitudes on the way home: Tronador Cirque 3700 ft.; Pampa Linda 3120; Sigfrido's 2900; Apartment in Bariloche 2980. Real altitude of apartment is 2700 ft. 1 December- Bariloche. Rainy windy all day. Put out traps at Hipodromo, 12 km WNW Bariloche, at 6 pm. Drizzly. Nire, Schinus patagonica, Berberis, neneo, Acaena, Senecio, ground cover, Colletia, palo pichi, radal, chacay, a few prickly juniper, some bare sandy ground. Some traps right at the fence around the race track. I put 21 Shermans and 21 MS alternating, Anita put 28 Shermans, and Peg 25? Shermans. Rainbow, but then more drizzle. 2 December- Bariloche. Some rain during the night, enough to spring some MS. Morning drizzly, 48. Ran traps at 7:30 a.m. My line 2 mice in MS and 2 in Shermans. Total score: 1 Eligmodontia, 5 olivaceus, and 4 Oryzomys. Drizzly windy. Processed the catch in the morning. One female olivaceus with 6 embryos, another with 9; the Eligmodontia with 7 late fetuses; caught no longipilis. The olivaceus all looked pretty much straight olivaceus, not xanthorhinus. The marsh where we used to catch olivaceus is currently mostly a lake; it is only 1/2 km east of the Hipodromo. Drizzlyrainy all day. Eileen Lacey and John came by. They are using a shoelace as a noose to catch Ctenomys sociabilis; They have caught as many as 13 in a couple of hours. The same individual shows up 80m away across the entire colony, so they think that all the burrows connect. Reithrodon shares the same burrows. John says the type colony has died out, and he thinks severalother colonies have died as well. Ran the Hipodromo traps at 6:30 p.m. and put out more Museum Specials. I had one live olivaceus; nothing else. 3 December- Rain off and on during the night, and drizzle in the morning. Picked up traps at 7:30 a.m.: 74 Shermans and 89 MS=163. Caught 1 Eligmodontia dead, 5 Oryzomys dead, 2 olivaceus alive and 2 dead. Sun came out in mid-morning, then more rain. Put out traps at 5 p.m. at the western end of Las Victorias real estate development. We approached it from the road back to the big electrical transformer station, but exited through the main "boulevard" of Las Victorias. These traps are probably 1/2 km west of our previous Las Victorias traps. I put 25 Shermans and 32 MS. Anita put 28 pairs (Shermans and MS), and Peg put 23 Shermans and 23 MS. Cool, windy, some sprinkles. The vegetation is very rich, diverse bushy steppe with more bunchgrass than our previous