Wolfson 1938 20. June 17 (cont.) 4 mls SW Prineville, 3300 ft., Crooks Co., Oregon. case it is also spotty and not a complete covering for the ground surface. Thus, the habitat is a mixture in equal parts of: Juniper, herbaceous plants, shrubby growth and places lacking any vegetation. In some places rocks are present, and in some regions Junipers may be lacking. Donald Tappe and I set a trap line E and W of camp. 100 traps were set about 20 yds. apart. The first part of the line - about 25 traps - was through a region containing rocks as described above. The remainder of the line was through the type of country described above lacking rocks but with Junipers. Bare places were present but small - a few feet square. For the most part the traps were placed under Junipers, Artemisia, and Chrysothamnus - none were placed in the open. The weather was cold and rainy and it rained during the night. June 18 Examined trap line and found that