Hyloxalus granuliventris (RCS) Dendrobates 'punctatus' Prostherapis palmatae Nordickson 1950 Nov. 21 Buena Vista, 4000 ft., Meta, Colombia, S. A. of breath while trying to whistle a rapid series of short notes. I can achieve the best imitation (for me!) by whistling a clear prolonged [illegible] note, 3 notes above violin A, while lightly slapping my relaxed cheek with my fingers (as rapidly as I can flutter my wrist). This produces as well the slapping noise, which must be ignored, but the frequency and general character each note are closer to the frog's call. Four calls timed were: 13 seconds duration 11 11 12 The animal showed some response to my attempts at imitation of the call.