Alcorn 1938 Dipodomys ordii columbianus March 30 1938 8 mi. W Fallon, 4000 ft, Churchill Co, Nevada. 19 kangaroo rats were picked up today after the distribution of strychnine coated rolled oats and four were Dipodomys ordii & the others were Dipodomys merriami. Both of these species inhabit the same general locality and often one may find dead ones only a foot or two apart. On several occasions I have caught two rats in mouse traps set two feet apart and on examination one was merriami and one ordii. The four Dipodomys ordii were as follows: Total Tail H. Foot Ear Crown Sex 7 1/6 4 3/6 1 1/6 5 1/6 ♂ 9 1/6 5 1/6 1 1/6 7 1/6 ♂ 9 7/16 5 1/6 1 3/16 7 1/16 ♂ 9 3/16 5 1/6 1 7/8 7 1/6 ♂ April 15, 1938 3 mi. W Fallon, 4000 ft, Churchill Co, Nevada. This species picked up after poison operations in sagebrush & sand as follows: Total Tail H. Foot Sex 8 7/8 — 4 1/2 — 1 3/16 — ♀ 4 Embryos 3 1/8 inch inside. 7 7/16 — 4 — 1 7/16 — ♂ 8 4/16 — 4 7/8 — 1 9/16 — ♂ 8 9/16 — 4 3/16 — 1 5/8 — ♂ 9 4/16 — 5