The Sierra Laguna bat, Lasiurus ega xanthinus, was described as a new subspecies by Thomas (Ann. Mag. Nat. Hist., Ser. 6, vol. 20, p. 544, 1897). All existing locality records of this bat are from the southern or tropical half of the peninsula of Baja California, Mexico. It is, therefore, of special interest to record the occurrence of this bat at Palm Springs, Riverside County, California.