E.V. Miller 1940 General Account Road ends at the ranch house, but a trail below the house goes to Huachuca Peak, which is a mile or so to the N. of us. Mar. 17. Picked up traps early in morning - none springing. Saw Arizona Jay carrying nesting material. Left about noon and drove to El Paso, Texas, where we slept in the hills. Mar. 18. Drove through Texas down into the Big Bend Region, on route to the Chisos Mts. in Brewster Co., Texas. We camped in th desert 47 mi from Marathon and about 30 miles, approximately north of the Chisos. In the late afternoon I set out 50 small mouse traps, baited with oatmeal and birdseed, 6 to 10 yds. apart, in wipced mesquite and Creosote Bush habitat. The traps were placed 2 to 3 ft from bushes, in the open. Benson and I strung some fish line across a watering pool about 15 yds wide, in hopes of getting bnts. Some horses and cattle waded into the pool and demolished part of our strings, which we reset before dark. A fairly good breeze is blowing. Mar. 19. Picked up traps early in morning. Took following: 1 ♂ Peromyscus eremicus (young), 5♂ Perognathus pericillatus, 1 ♂ Dipodomys merriamii, 1 ♂ and 1 young ♀ Dipodomys ordii, 1 ♂ Tadarida mexicana. Put up 7 of these. After this we drove south to the Chisos Mts. in the Big Bend Region. These mts. are now in process of becoming a National Park. A large CCC camp is located here, developing roads, wells, etc. We obtained permission to trap small mammals in the Park. Late in the afternoon Benson, Margo,