Euplotes leticiensis, n.sp., from the Letician Drainage into the Amazon River.*

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Abstract
SUMMARY. In water taken March 3, 1956, from a tributary of the Amazon River, near Leticia, Colombia, an abundant ciliate fauna included large numbers of a species of Euplotes. Cursory examination showed a pronounced left wing like that of E. novemcarinatus Wang. Careful study, however, revealed a distribution of peristomal membranelles and peristomal morphology more like that of E. euryostomus Wrzesniowski. The positions of ventral cirri resemble those of E. woodruffi Gaw. The two right caudal cirri are furcated, as are those of the first two above‐mentioned species; but the five anal cirri are not. The C‐shaped macronucleus, like that of E. aediculatus Pierson, has the upper left part of the “C” somewhat depressed. A large organism, it averages 155 μ long by 130 μ broad, length ranging from 87 μ to 203 μ, and width from 67 μ to 194 μ. It is presented as Euplotes leticiensis n. sp.