Bufo (marinus?) Lake Olomega, 200', left 't. San Miguel, El Salvador Feb. 24, 1942 Hard several toads calling from the stream, about 30 yds from the hacienda. On investigation turned out to be the same species as that collected at the lake shore on Jan. 27 (1103). The call was the same - a very loud metallic trill suggestive of a riveting machine. The posture in calling seems to be either nearly erect / or with the body more nearly hori- zontal -. The vocal sac is enormous, and ri- gidly distended during the call. However, there is very little tremor noticeable in the sac during produc- tion of the call. After the last note of the trill the sac is partially, but not entirely, relaxed. Each trill lasts also from 5-7 seconds, and the intervals between all are irregular. Sometimes two are given one right after the other; at other times several minutes may elapse between calls. There were 4 individuals within 20 yds, all of them in voice. Two were in water, one on the streambank + one on a rock in the middle of the stream. They took no alarm at my approach and called when the light was turned on them. When one starts a trill, the others seemed to join in - these toads start calling at about one hour after sundown + continue well into the night. My observations were made at 6: 45 p. m.