Murray 1948 2 Dipodomys merriami Apr 16 Cerro Centinela, 300 ft., 13 mi WSW Mexicali, Baja Calif. Last night moved my traps about one mile down the wash to the north, into a sandier part. The vegetation is a little thicker and seems greener with more ironwood. The moon was up most of the night in a clear sky. The catch this time was 4 rats, all of which I released. This time also had 5 Perognathus baileyi and 2 Perognathus spinatus. I am interested to note the reactions when these rats are released. Some jump out immediately when the trap is opened, even if held 5 feet in the air, then jump their way at top speed to the nearest brush. Others will come out into my hand, look around, and haltingly start away, usually picking up speed after a foot or so. At San Felipe, rats which were released around camp, a house, and surrounded by rocky ground or hills, generally remained on the spot. One was found on the front porch picking up seeds in broad daylight, and it took quite nearby movements to frighten him. Another was found in the bread (see journal). Here at Cerro Centinela one which was released at camp in his habitat but some distance from home, insisted in hiding in the equipment. Holes were available,