Abstract
SUMMARY. A survey of protozoa in four water samples from Colombia, South America, yielded 84 species identifiable to genus or to species. Three of the collections were from the Amazon River and a tributary in the vicinity of Leticia, at the southern tip of the country. The fourth was taken near the high Andean town of Medellin in central Colombia.All four subphyla are represented. Forty ciliophorans, 26 mastigophorans, 17‐sarcodinians, and one sporozoan are included. Of the ciliophorans all but one are euciliates in three orders. The exception is a suctorean. Two classes, and six orders of mastigophorans are represented; one class, and two orders of sarcodinians; and one class, one subclass, and one order of sporozoans. Eleven suborders, 33 families, and 49 genera are exemplified.Other protozoa seen, but not identified to generic or specific accuracy, are omitted.

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