W.C. Russell 3 mi. NNE Canyon, 8400 ft., Yellowstone Park, Wyo. Sept 4 1967 Didn't see a single flycatcher of any kind. Have been hunting for deep, always hoping to hear the quiet tapping of some sapsucker & finally heard it in the quiet of the ASM. Made a sneak & found a Williamson busy exploring the lower trunk of a lodge pole. End of story, for him. Out of 26 mouse traps set in along tiny trickle running up slope from this picnic area & through lodge pole took: 5 Peromyscus maniculatus 2 Microtus richardsoni 2 Zapus. In after noon checked traps & had 1 young richardsoni + 1 Lincoln Sparrow. Left the traps out. Sept 5, 1967 Warm this morning - at 6:30 was around 45°. Now at 9 P.M., we are having a shower. From the 26 mouse traps took 1 Flying squirrel, 2 Zapus, 3 Peromyscus maniculatus + 1 Clethsonomys. The latter taken from trap set on top of log. I usually think of getting them beneath a log.