Wyer's Pileo 1774 Journal 50 Red Barn, National Seashore Headquarters, 1 mi. W. Olema, Marin Co., Calif. 15 May By arrangement with Dick Brawn we had a key to get into the barn. There were more bats than last time, at least 6-700. all were on the 2 side, even tho both lights had been off for at least several days. No dead bat seen on the floor. In The roost itself was almost entirely Myotis yumanensis. No M. thysanodes or frutigerus. Caught 4 Tadarida by working at it. about half are pregnant with large (13-20 mm) embryos. the others have either very small (3-7mm) swellings or are unpregnant. One is obviously multiparous, with infused epiphyses in the palange. Most bats are fat. Checked out the fur barn where we caught an eptesicus last trip, but found nothing more than a few droppings. In the Red Barn we cleaned off the scaffold & roof beams & put down some metal traps to catch dropping. air temperature 11°C at 8 A.M. Muddy Hollow, National Seashore Marin Co. Calif. ±200 ft arrived around 9:45:30. Saw one bat along the roof beam - a M. yumanensis & one under the lath paper walls a Tadarida (the first from here). But large piles of dropping on the floor & dropping splattered uniformly over much of floor & walls? God is a right roost?