W. Riene 1953 Journal 12 July Mexico: Sinaloa Entire day spent in descent to coast with short collecting stops at various places along the way. A strange frog present at mid- elevations appearing like R. pipiens without spots, brown in color, and occupying pipiens niche. A series of these taken. Half or more of road now wide, graded, and scraped permitting easily 20-25 mph. Road enters thorn forest about 25 miles from Mazatlan and at about 1500 ft. Drove on to make camp at dusk in and sub tropical scrub 9 mi. N Mazatlan in first rolling country N of city, light rain during early evening (apparently the first rain in several days at least) brought toads onto highway, Scaphiopus conchi, Bufo mazatlanensis, Pternophyla lobiens and Suidica brandini being taken. 13 July Mexico: Sinaloa; 9 mi. N Mazatlan My day in camp. Breeze in several short forays reports large noonday breeding chorus of toads (mostly Scaphiopus) a muddy pool nearby. He also in daylight caught the rare Diaglena spatula by this pool. In evening he picked up a large Hypopachus sp. on dirt road by camp. I caught Orycteleis in camp area.