Nandriksen 1950 Leptodactylus "obscura" Nov. 19 Villavicencio, 1600 ft., Meta, Colombia, S. A. One taken on steep, grass-covered creek bank just 5 of town. It hopped very rapidly and showed great agility in its attempts to avoid capture. We heard, and Dr. Stebbins collected (RCS # 5063), another at the edge of a pool (same pool as employed "Hyla microcephala" and "green-backed dendrobates"). || Its call (at least the one we heard at that time, being given by that animal) is a single note, repeated at intervals. I would describe as a sort of musical chuck. Nov. 22 At 9:30 p.m. an individual's calling was studied; two or three others were also calling. No calls were noted earlier in the evening, and none were noted from about 10:00 to 11:00 p.m. || Calling individual studied was sitting in a hole (entrance to rodent hole?) in an 18" cut bank of the creek. It was about 4"-5" above stream level. The entire bank was festooned with horsey masses of fine roots; the frog was visible only when these were removed. || With reference to notes of Nov. 19, above (last sentence), I would