Paul DeBenedetti 1960 Bufo marinus Dec 24 Rio Cihuátén, 18.1 mi N Miramar, Colima, Mexico. While collecting some Eleuthrodact- tyles we heard in the back ground what I thought was a truck engine warming up. When the sound remained so constant, we - Gene Hippmann, Nate Cohen, & I - went over to investigate it. It was a large chorus of these toads. They sat either in large open pools in the river or on the mud close to the pools. Some would swim into the pools, but most remained motionless until collected. They were quite conspicuous in the light, showing up light brown against darker. Nate caught a pair.