El Karlstein 1956 Bufor microcephalus April 21 Mojave River, 3 mi N, 2 mi W Victorville, S.B. C. Bob Stobbs found a couple of adult females up on dry sandy surface some 30 yards from running water in the river. I worked downstream from cage site to a large flattened area where the river bottom had been scraped to build cage on earthen levee. Small ditches and pools over an area 75 yards across and extending for hundreds of yards. Bufor braeus, B. microcephalus, R. catesbeiana and Hyla regilla all active. The soft trill of microcephalus lasts about 8-9 seconds. Terminates abruptly. An extremely rapid note, soft and ventriloquial as I write on adult is a foot from my leg and quite undisturbed. The irregular black spots on the gray-tan ground & color offer quite disruptive. No nasal stygie whatsoever. Cloacal of this ♀ 16.3°C at 9:57 P.M. Water 18.1°C in puddle 1½" deep 8x10 feet length and width. More males heard calling from NW (?) side of river. One pair in angulatus and one dead ♂ caught by male braeus (see B. braeus notes). When held, the ♂ microcephalus vibrates without any loud trill. Vocal sac round to oval, whitish. Angulatus pectoral ad like braeus. The eye shine of these toads is reddish and not brilliant like some other anurans.