Affirmative 1942 Itinerary June 14 Waucoba Mtn. to Montgomery Creek, Mono Co., Calif. At 4 1/2 mi. N Big Pine, where we stopped and I collected copepods in the marshy areas along the road, we heard Savannah and Sparrows, Red-wings. Drove in to Bishop and on to Benton Station where we gathered certain information concerning the creeks running down the west side of the White Mountains. We proceeded up Montgomery Creek to our present collecting site, which is along this creek at between 6850 and 6900 feet elevation. Pisions begin at (6500 to) about 6000 feet up this canyon. The canyon is very narrow with shale-covered side slopes. To the northeast is Montgomery Peak (13,000+ feet). There are very few junipers in this region (I have seen only 1, at about 7000 feet). At about 7100 feet, in the canyon bottom, there is some Mountain Mahogany growing with the pisions. Along the creek, which is flowing now and apparently flows all year long, there is scrub willow. Between the pisions, and on the small flats in the canyon bottom, Artemisia predominates. June 15 Set out 65 mouse-traps. 45 were in the flat along the creek and 20 were in the pisions and rocks. Those in the flat were on coarse, firmly-packed, rocky soil grown with Artemisia, Chrysophranum, and a few pisions, and 3 traps were among the willows. These traps caught 1 Reithrodontomys megalotis, 6 Perognathus parvus, 9 Peromyscus maniculatus, 3 P. ermitius, and 2 P. truei. There is sign of deer along the creek. Cottontails are scarce but jack rabbits are abundant along the lower edge of the