Nordrichen 1950 Oryzomya Oct. 21 5km N. Villavicija, 1400 ft., Huila, Colombia S.A. 25 traps around an No/ camp yielded one & (taken about 20 yds. No/ camp just over edge of bank sloping to point where water for camp is obtained). Little brush at this point. This animal was an adult, with enlarged mammary glands and [illegible] swollen areas in the uterus. I recorded these as & embryos. The entire genital tract was preserved in Bouin's fluid. Oct. 22 During the day two small, apparently young of this species, were taken in traps in the immediate vicinity of the capture of the adult animal last night. Both were rather badly chewed by ants, and were fly-blown when found; both were preserved as alcoholics. Could there be nursing young of the adult & taken last night, driven out in the daytime by hunger or other stimuli? The adult had obviously enlarged mammary glands. If these were young of that &, her pregnant condition indicates a considerable reproductive capacity.