Protozoal Parasites in Cainozoic Times

Abstract

IN the issue of NATURE for October 3, 1918 (p. 95), which has just reached me, is a note on Prof. T. D. A. Cockerell's discovery of two new species of Glossina in the Miocene shales of Colorado. It is said that “Osborn's suggestion that many large Cainozoic mammals in America may have been destroyed by fly-borne parasites is rendered highly probable by the wider range of tsetse-flies now indicated by Prof. Cockerell.”