Hendrickson 1950 Elachistocleis ovale Nov. 9 Villavieja, 1400 ft., Huila, Colombia, S.A. with our powerful headlamps. It was sitting on semifluid mud beneath a tangle of living and dead grass stems. Two local boys who watched the hunt said that many such voices could be heard about a "charco" (pool) on the opposite side of the river. Re-reading my Nov. 6 notes on the voice of this species, I believe I would now characterize the voice as: "eeeeee" (omitting the initial consonant). This animal seemed to give a definite response to my attempted imitation of its call: a hard, nasal "seeee" produced by setting the jaw hard together, drawing the mouth corners as far back as possible, and holding the nostrils closed while the sound was produced. The sound seemed closest to the frog's call when I kept the volume at a near-minimum.