Crickson 1934 Yuma 7 Frost Yuma. outer margins, though thought might feed on shallower regions. Species reported as uncommon in region. 11:30- Calf. side 2:00 spent in dry wash with catclaw, palo verde, and cottonwood trees and on mesa above; there only scattered creosote and ocotillos on rocky wind swept ground. Only birds seen = 2 Plumbous Snatchers. 4:00 - 4:130 - Set 50 traps, middle size, on sandy red region 1/6 miles N and a little east of Yuma. Also set 20 rat traps in tule; water too deep to show tracks, used logs, and stakes for trap locations. Jan. 7, 6:30 - 8:45. Took up traps in sandy wash, catch 3 Perognathus and one Dipodomys; two other traps sprung, bait gone from most. 7:10 - 11:00 spent on lake; looked at traps first, no catches; waited near points where rail was seen day before; none observed or heard. 4:30 - 5:30 set out 50 middle sized traps in sandy stretch of night before; but 1/2 mile farther from road. Strip is narrow not more than 1/8 mi wide, between cultivated silt soils; starts from canal and runs east away from it; vegetation catclaw, palo verde, Atriplex lentiformis; some scattered grass. Dipodomys not saved. wt. 36.14 ?. Jan. 8, 7:00 - took traps up; catch 1 Dipodomys 9 41.73 yrs not saved; two traps sprung; saw Cottontail to-day and yesterday; also Gambel Sparrows. 7:45-10:00- spent in dry wash cutting throu