E.U. Miller 1940 General Account. No eggs. Our location is 36 mi. ESE of Monterrey, Nuevo Leon. On driving on to Monterrey April 14 we found the automobile mileage to be 39 miles. April 14 In my traps I took 1ṽ Perognathus merriami, 1 Ṿ immature Perognathus nelsoni, 3 Ṿ and 1ṽ Peromyscus eremicus, 1ṽ and 1 Ṿ Peromyscus leucopus - these in the M. Specials. In the live traps I took 2 ṽ P. merriami and 1 Ṿ P. eremicus. We drove on from here to Monterrey and from there more or less south into the mountains about 10 miles at an elevation of 4000 ft. There is a small resort here called Chipinque. The road was built by Almanzan. The habitat here consists of large oak trees, a few pines and other species unknown to me. Underneath is a medium thick growth of low brush, weeds, and green grass. The ground is rocky and in a small canyon where I set traps there are boulders 30 ft. high, covered with small plants. We are camped near the small house of a native. The person in charge of the resort refused us permission to camp there. In the late afternoon I set out 58 M. Specials and 10 Schnyfer No 1's, although I saw no sign of any rats. Small traps were baited with oatmeal and birdseed, the large with dried peaches. Our camp is by a house with a pump for water-place known as Aguaje de Lobo. We called it 10 mi. S Monterrey, Nuevo Leon.