easily taken in a butterfly net, I always found them in the main tunnel and never in laterals. Another interesting genus found in the tunnel was Natalus, No. 12092. It was found in a short lateral with many Glossophaga where it was located about two feet from the floor and clinging to a tiny projection on the tunnel wall. Most of the other bats were above. I saw a Mylomys as it hurried behind some partially decayed and water soaked poles. Clear day. 7 A.M. - 71°F. in shade. 7 A.M. - 79°F. in sun, -- 12 N - 91°F. in shade - 12 N - 108°F. in sun. December 11, 1926 - Several mines in the vicinity of Monte Cristo were visited to-day - Marquitos, Santa Barbara, Santa Maria, and others. Only one genus, Glossophaga, was found, and usually very few in numbers. The water was too deep for us to enter the North Monte Cristo tunnel, however we saw many bats far back in the tunnel.