Chattin, J. 1940 Itinerary 3 mi. N Potholes, 250 ft., Imperial Co., Calif. Dec. 25 present at this date. On Jan 14[?]/1939 there (Cont.) were bats present, but of only one sex. All the bats taken were fat and none of the ♀♀ contained embryos. Drag line at locality 7 mi. NE Fort Yuma, 200 ft., Imperial Co., Calif. was moved farther along canal bank and bats were skinned during the evening. Dec 26. a.m.- Trap line was inspected and most of traps were removed. Catch consisted of 4 Sigmolon, 4 Reithrodon[mys] and 3 Mus and 1 Albert Towhee. In p.m. a line of 70 traps were set out along ditch bank overgrown with Bermuda grass and arrowweed. Traps were set at about 10 yd. intervals in runways of Sigmolon. In the evening Rhomomys obtained by George Barry at locality at 1½ mi. NW Bard, 200 ft., Imperial Co. Calif. were skinned. Dec. 27 a.m. Drag line was inspected and rebaited and left out during day. Catch consisted of 7 Sigmolon, 3 Mus. and 4 Reithrodon[mys]. During afternoon a line of 50 traps was set out along rocky dry wash 2 mi. NW Potholes, 250 ft.; sign appeared old and was not abundant. Dec. 28 - Last night more Rhomomys trapped by George Barry at 1½ mi. NW Bard were prepared as study skins. In a.m. the trap lines at base camp 7 mi. NE