Pearson-1988 3 on the gopher skulls on the balcony. Michael Christie and Marcello Bettinelli came to discuss their revision of Olrog's field guide to mammals of the Southern Cone. Then Arturo Tarak came for a visit. He reports many mice crossing the road at night as he returns from the trout farm at La Primavera (Traful Valley) April 26. Bariloche. Morning clear, temp 0*. Yellow jackets not flying at 9:15, temp still 0. Hummingbird investigated their opening (they were inactive). But at 9:30 with no sun in the whole backyard yellowjackets were going and coming with shade temp of 1° C. April 27. Bariloche. Morning clear, frost, temp on balcony 0° . Yellow jackets were flying at 1*. Left at 10 for Rio Castano Overo and Tronador. Cloudless; but at Pampa Linda there was still frost and ice on shady puddles at 4 p.m. I didn't dare try the last km to the usual campsite on the Castano Overo, so stopped at a rise with a pulloff from the road, big coihues and scrubby bamboo. At 4 p.m. put out 12 cage traps in forest, all of them alio ng fallen logs, then about 14 Shermans mostly along logs through the coihue/lenga/bamboo/Berberis linearifolia. Then about 15 Shermans in the marsh (grass/sedge/Berberis/scrubby little nire. Then about 10 Shermans up a gully above the road. Total about 51 traps. Three buses and two cars on the road in to Tronador (they made a luch stop at Pampa Linda). About a week early for the best autumn colors. A flock of big magellanic woodpeckers were working the trees at the campsite when I arrived. Still a few cows wandering around. April 28. Castano Overo. The 51 traps caught 11 Ako longi, 1 Chelemys, and 1 Ako olivaceus. The olivaceus and one of the longis came from the mallin, the rest mostly along longs in coihue forest although there are a few nire and/or lenga mixed in. Nothing caught during the day. Heavy frost during the night, the day cloudless. The mallin was heavily frosted and stayed covered with frost until after the sun reached it at 11 a.m. This frosting seems to make clear why the three Nothofagus species are distributed as thjey are: deciduous nire in the mallin on the valley floor where it gets heavily frosted; lenga on the upper slopes where it faces heavy snow and cold; and coihue in the "banana belt" on the lower slopes. Picked up five cage traps near camp, replaced them with Shermans, and moved the cage traps nearby to where there seem to be some Geoxus diggings. At dusk a whet-whet (Rhinocryptidae) came into camp and scratched around in the leaves. It makes 3, 4, or 5 scratches with the same foot, swivelling on the other foot, givong its tail a droll waggle. April 29. Night clear, almost full moon. It was much warmer than last night, windy, no frost at all. The trap lines near camp caught only two Ako longi, but those in the marsh caught 1 Auliscomys, 1 or 2 Ako olivaceus, and 3 or 4 Ak longi. The woodsy line above the road across from the marsh caught 1 Chelemys and 1 Ako longi. The forest on this line and around camp contains lenga and