JE Simpson, 1938 32. 800± ft., Cerro Colorado, 28 mi. w. Sonota, Sonora March 26, 1938 In the 50 mouse-traps set among the creosote on the dark cinders (which cover in a thin layer the tan desert soil) caught 7 Dipodomys merriami (3♀ + 4♂). One (♀ 76) put up as study skin; this kangaroo rat photographed by Dr. Benson along with a Perognathus intermedius and a P. pensillatus. Mr. Lenon left us here after Dr. Benson had purchased some of his surplus groceries; [illegible]; by mistake, left his axe with us. We put up our specimens and then climbed Cerro Colorado for a survey as we had arrived here after dark yesterday. The crater was of an explosive type resulting in a mixture of igneous and metamorphic and sedimentary rock; however, where we trapped the ground soil was covered with cinders and some lava. The vicinity showed little promise; so Dr. Benson decided to push to Crater Elegante tho we were not sure of the road. If we missed Crater Elegante, the "road" (a few cars had passed by) was almost certain to take us to the coast where we are to go eventually anyhow. Our proximity to the coast and the probability of Indian encampment here was manifested by some fresh (is not fossil) marine shells and pieces of them. Back in camp Señor Delgadillo shot two quail with a well-placed shot from the "kitchen"; so I went after the covey and round out the three. These are Gambel's