"Herdrickson" 1950 Bufo "granulosus" Oct. 21 5 km. N. Villarraga, 1450 ft., Huila, Colombia, S.A. associated with calls heard at close range were sitting on bare mud, one near and one under (an overhanging mass) stream-washed detritus. Nov. 6 Dr. Stibbins and I, working at night in banana patch S. of camp, collected several and heard others from various points in the field. So far as I could tell, there were as many near the water as on "drier" ground away from the water. They responded somewhat to imitations of their calls. At one time a passing train seemed to stimulate calling (vibration?) Later in the evening (10:30 P.M.) the frequency of their calling had definitely increased over the frequency at 7:30 & 8:00 P.M.