Catocombs. Found two torpid ff in Manganta tunnel, and 3 (2ff and 1 young ?) in the 20-House Hill. Two awoke escaped from tunnel just outside 20-House Hill. Night clear, moon almost full, lowest temp. 44° during night. Dec-21 fooled into OP and Catocombs. Found 2ff + 4 young ? in OP tunnel and 1 M in thyroidea, all torpid. Temp. of tunnel to 50°. In Catocombs 5 ff and 4 young ? temp. 49°. Also found a young and an adult ? in the 20-House Hill that had arrived since last night: killed them at once (9 p.m.) but stomachs + intestines empty. A third one that had come in during the night (a female), was in Manganta. almost all ff had rather sharp drop of temp. expressible. Got distinct impression that the tunnels weren't cold enough for good hibernation, and that the bats preferred cold places such as bottoms of vertical shafts opening up top. Catocombs at cold straight tunnel was 49°. Released several in daylight by car. Several took some course to nearly oak tree, circled through its depress branches, circled its trunk, then off just above, though, or even under the chaparral. One or more hung up in the chaparral. We were surprised at how slow they flew. Bees! I had about 10 mature specimens along the edge of chamise and grass – caught mother – and one in the Kenworthy tunnel – 1 bro. tree.