Lee Arnold 1937 Dipodomys ordii (f microps?) 4 mi. S Gandy, 5,000 ft., T Millard Co., Utah June 6, I caught 12 of these Dipodomys in a trapline of 95 traps set on the east side of the road in amongst the silt-like sandunes which had blown up in irregular rows. These "Dipos" were very abundant in local colonies here and there but where the burrows were not near I did not catch many. In some regions of the sand dunes the rats would tunnel back into the wall of the dune in a more or less horizontal position. At many places in the silt I found numerous shallow holes which had evidently been dug to hide food in. In one instance I found some green pieces of greese wood buried partly in one of these burrows. I could distinguish that one of the Dipodomys was much paler than the others and had very fine pointed teeth. From the characteristics mentioned I concluded that this one was ordii while the darker ones with larger "squared off" teeth are microps. June 7, Out of twelve traps set on the bottomland NW Camp near Smith Creek Cave, White Pine Co., I caught one Dipodomys microps. June 8, 3 mi. E Smith Creek Cave, out of 42 mouse traps set on the flat low bushed