have been moved; a young man who helped with the Cueva Traful identification of larger mammals opened the case and let me fondle the Mylodon fur. Alcover and Diego had been to Hui Hui, Laguna Verde, Lago Currhue, Lago Norquino, etc. and had caught both Aconaemys and Octodon. I did not see the Octodons, but saw about 10 flat skins of Aconaemys and maybe five skulls, plus some skulls that they had borrowed from the museum in Valdivia. They seem to be convinced that there are two tooth patterns that would correspond to fuscus and sagei. They had specimens of sagei from Hui Hui. May 11. Buenos Aires. Went out to the Museum again. Had a tearful session with Martha Emilia de Fornes as she reminisced about Abel and how people took advantage of him. Some of his personal collection ended up in the Museum and is kept as a unit in two separate cabinets, one for bats and one for the mice. It is in better shape than the main collection, but nonetheless I couldn't find several skulls that I wanted to see. Martha Piantanida showed me the enormous data bank that is her thesis on Akodon dolores- growth and reproduction in captivity. Just as I was leaving, Josep (Toni) Alcover and Diego Verzi arrived. They had been looking for me at the hotel and had been unable to reach the museum by telephone. We went back to the hotel where they photographed my specimens of Aconaemys, and then we talked about Octodon and Aconaemys. They have prepared a manuscript on the first occurrence of Octodon bridgesii in Argentina, with specimens from Lago Currhue chico and from along the trail that goes from Laguna Verde to Volcan Huanquihue. The latter was on the way up to the Escorial where we caught our specimens. They were in bamboo habitat, and Aconaemys lived nearby. In fact, I think they said that they caught Aconaemys and Octodon from the same burrow; if not, very close together. Rattus norvegicus also nearby. They also caught Irenomys and six Dromiciops. They seem happy with calling their specimens Octodon bridgesii, based on the drawing in Osgood and with comparison with two specimens borrowed from Valdivia. All of the Octodon were caught with rat traps baited with "pan con aceite." May 12. Buenos Aires. To Facultad de Medicina again, where I talked with Kravetz, Bellocq, and Maria Busch. Kravetz is finding seasonal differences in the immune systems of mice (Akodon azarae I think). He cannot say yet whether it is connected with population density. Dinner with Gustavo Zuleta, who is promoting a new but still non-existent journal of Argentine ecology. Carlos Verona would be the editor. The Argentine ecological society does not seem ready to act, nor CONICCT. Two years ago I offered to supply a desk-top-publishing computer, but still just talk.