W. Riemar 1953 Journal 18 July Mexico: Sinaloa: Mazatlan northward Drove greater portion of day from Mazatlan to point 7 mi. W Quamichil. A considerable portion of this is dirt road in preparation for paving. Several spots were made that collecting stops along the way. 19 July Mexico: Sinaloa: N to Guaymas Again much of day spent in driving and collecting through region of Navajo and Obragon to Guaymas. Camp made just beyond north city limits at about 2400 hrs after futile road collecting. During evening stopped at showing roadside pools and collected Pterophyta and Bufa debilis 20 July Mexico: Sonora: Guaymas and northward. Entire morning spent bathing at Miramar and in making supply purchases in town. During afternoon and into evening (2400 hrs.) drove N to Santa Ana and camped just N of town. Night collecting, except for 1 dead Trimerophodon, was poor probably because of half moon. 21 July Mexico: Sonora: Santa Ana to Nogales Broke camp at 4 mi. N Santa Ana in early morning and drove directly to Nogales stopping only to pick up 1 dead Thamnophilis cryptopsis. By noon we had successfully crossed the border with no trouble except that a better