December 8, 1926- We entered the San Jose mine which is located on the south bank of the Rio Seco and about one half of a mile down the river from the cemetery. It is perhaps one hundred yards down stream from where the trail crosses the river; the trail leads to San Carlos. There were many loose trees along the bank at this place, but it was open beneath, therefore we had no trouble locating the mouth of the tunnel. As usual with mines in the Divisadero region, the mouth had caved in, there making a 20 foot wall with a rocky face above the opening of the mine. On this wall I saw a little black bat which was probably Saccoteryx. It flitted away before I could shoot it. When I flashed my light into the tunnel many small bats, Glossophaga, shot out past me and were lost in the trees. There were two openings into the tunnel. One had water in it and we could not enter there. The other was