Quast 1948 Perognathus baileyi 1 April 16 Cerro de Centinela 300 ft. 13 mi. WSW Mexicali Baja California Three males caught in live traps baited with ground corn on alluvial material below bare mountain slope. (#55, 56, 57). Traps set the night of 15th and gathered at sunrise on the 16th. April 18 Cerro Prieto 30 ft. 20 mi. SSE. Mexicali Baja California One male caught in rocks 15 ft from mesquite - sand association in draw (#74). May 6 Bahia Concepcion 13 mi. SE Mulege Baja California One female having no embryos and very fat caught in sandy area in back of shell beach and below lava rocks. Caught among large, separated bushes growing in coarse washed sands. Specimen #147 May 7 Same location. One male (#150) caught in live traps set among "Mangle Dulce" bushes, Cuestos, Palo Verde, Cholla, and Cardons in sandy area behind beach N.E. of camp last night. The specimen had enlarged testes of 15 mm. May 17 Trinida, 1700 ft. Baja California One male and one female (Emb. 20mm) caught in live traps set in abandoned cornfield which was surrounded by a brush fence. Both specimens were caught in sandy soil under brush with no rocks nearby. Specimens cataloged nos. 194/195 June 17 West Llano de Hired, 50+ ft. Baja California 10 and 11th caught last night in 47 live traps