E. V. Miller 1940 30 General Account and approximately 20 mi. NW [illegible] San Luis Potosi, San Luis Potosi. In the afternoon I collected 2 Sceloporus sp., one Crepidophorus serlineatus, one ? lucifer Hummingbird with nest and eggs, one set of Cactus Wren eggs; and a Silvilagus sp. In addition I saw Cactus Wren, Bewick Wren, Cactus Woodpecker, Cinclatela (??), Desert Sparrow, Mockingbird, Scaled Quail, Verdin, Brown Towhee, Curve-billed Thrasher. At the Hacienda La Parada I saw English Sparrow, Barn Swallow, and Cliff Swallow. The Hacienda is very large but practically deserted now. The country here is made up of low hills with a medium thick cover of several varieties of cacti, including Nopal and Cholla, and brush. I set out 75 M. Specials and 4+7 live traps, for mice. May 20 In my live traps I took 1 ? Dipodomys merriami and 3 ?, 1 ? Perognathus nelsoni . In the others I took 3 ? Dipodomys merriami , 1?, 1? Peromyscus eremicus and 1?, 3 ? Perognathus nelsoni. May 21 Set 75 M. Specials and 4+7 live traps for mice last night at some locality as May 20. Took 1 ? Oryzomyx touristus , 5 Perognathus nelsoni , and 1 Peromyscus eremicus . In the afternoon we drove toward San Luis Potosi, stopping 1 mi. NW of Mezquitic to collect Sceloporus sp. These were very numerous in ponds of water.