Ctenomys sociabilis April 19. Arroyo Carbon below La Lipela. Saw no fresh diggings at the usual place 10km N Nahuel Huapi; ditto at 20km N near the new trout farm, and 30 km N at the Arroyo Carbon place. Talked with the puestero on Estancia La Lipela while I was camped at Arroyo Carbon. When asked about small mammals he pointed to the west (Cuyin Manzano) and said there were ratas de la sierra there. When asked about tucos, he said that there were none here but lots across the Limay River. He said the tucos make a sound like their name, the rata de la sierra makes a more squeaky sound, which he imitated; says they live in burrows like tucos. i.e. He distinguishes sociabilis from mendocinus!