June 17 W. end Llano de Hiley, 50+ ft., Baja California on which the small dry plants having been [illegible] growing in tufts. Within these hillocks numerous mouse-burrows may be seen and their tracks are abundant in the sand around the hillocks. 47 live traps baited with bird-seed and set in playa and intermediate area last night caught 21 Perognathus baileyi. Dr. Benham set his live traps in the same habitat and obtained one Peromyscus maniculatus in addition to two Pero- gnathus baileyi. Tevis and Murray, trapping in the sand dunes caught Dipodomys agilis + merriami and Perognathus baileyi + arenarum. I caught one Dipodomys merriami in a rat trap baited with walnut in the sand dunes last night. June 17 Pozo Grande, 25°46'N, 112°02'W, Baja California Arrived here about 6 P.M. after a fast trip from the previous location, leaving there about 1:30 P.M. Had dinner at one of the houses and then went down to the pool to hunt bats. Found the large pond in about the same condition as it was previously, the water being a little lower and of a darker green color. The first bats seen were at 5:30 PM and turned out to be Eptesicus fuscus which were flying low about the Mangle dulce, Mesquite, and other bushes in the wash. Many were seen flying down the wash and struggling into a