Infection with Bertiella mucronata, a tapeworm of monkeys, is reported in a 29-year-old woman from Asuncion, Paraguay, South America. The original diagnosis in this case was made by finding eggs and proglottids of the parasite in the feces. Specific identification of the worm was based on a review of the previous human cases and a detailed study of proglottids removed by anthelmintic treatment and here described. Examination of a Bertiella taken from a monkey in Argentina and one from an Indian monkey, Macacus rhesus, in Germany made it possible to reestablish the species B. mucronata (Meyner, 1895), Stiles and Hassall, 1902, whose type locality is Paraguay, as separate from B. studeri (Blanchard, 1891) Stiles and Hassall, 1902, whose normal range is limited to the Eastern Hemisphere. In four of the twenty-four cases of bertiellosis now reported from man, the species identified was B. mucronata, three from South America (Brazil, Argentina, Paraguay) and one from Cuba.
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