Kendrickan 1950 Journal Nov. 12 Bogota, 8500 ft. Colombia, S.A. Most of day spent in bed, and resting. Both Dr. Stabbins and myself are suffering digestive disturbances. My mind being turned upon myself as it is today, I can think of nothing to contribute other than descriptions of invertebrate pests encountered in the vicinity of Villavieja. Unless the reader wishes forewarning for a trip to the area, the notes which follow are probably valueless. A species of gnat, about 1 mm. long, proved very troublesome to me (less so to Dr. Stabbins). They are apparently much more common in other nearby areas; if so, I would not enjoy visiting those other areas. Their bite is apparently painless to most, and unnoticed during the process. I felt them bite most of the time. A short time after the bite a small (2-5 mm.) red weal appears. With Dr. Stabbins, these began to itch the next 12-24 hours, and upon scratching, swelled to white, raised areas resembling mosquito bites. On the natives, they never seem to form more than the weals—more strongly so on infants, less so on adults. In my case, itching of an