Green 1927 Colorado River, 20 miles S. of Pilot Knob, Lower California, Mex. Oct. 18, 1927 Six steel sets caught nothing. twenty five mouse traps caught 4. Peromyscus ♀, Onychomys ♂, Perognathas ♂, four mouse ♂. 787 Peromyscus ♂ 26.g 171-76-21-12 arrow weed sandy soil 785 " 22.g 169-90-21-12 arrow weed sandy soil 789 ♀ 22.g 190-93-21-13 arrow weed sandy soil. 790 Thomomys ♀ 112.g 206-65-X-4 Under lemurata grass sandy soil. 791 Dipodomys ♂ 41.g 248-148-40-9 sandy soil side of track 792 Perognathus ♂ 16.g 190-63-23-5 sandy soil. Under arrow weed 793 Onychomys ♂ 26.g 147-53-21-15 sandy soil Under dead willows. 794 Thomomys ♀ 147.g 210-C3-31-X Changed two sets tonight to a point near the willows in the arrow weed on an animal trail. The other one I set on the railroad levee beside the track. It went up the