Palmer 1935 Dipodomys merriami 7 mi. E Ontario, 1050 ft., San Bernardino C., Calif. Aug. 9, 1935 Caught 1 in 50 gr.-size mouse traps set 15 pairs apart across a low dunes of fine sand by low plants of Ambrosia psilo- stachya, Oenothera pallida var. californi- cal, Nicotiana bigelovii, Salsola kali, Crotor californicus, and Amaranthus gracizans. This specimen, a 3, had enlarged testes. Numerous tail tracks in the sand would seem to show that there is a greater population here than this record indicates.