I analyzed chapter VIII of William Henry Hudson's “The Naturalist in La Plata”, a popular book published in 1895. Herein the famous naturalist ornithologist and writer relates many observations made by him in his youth in a region of Buenos Aires, Argentina, accounts of a large number of natural phenomena especially pertaining to animal life. Chapter VIII is called “Mimicry and Warning Colours in Grasshoppers”. Although very interesting by virtue of Hudson's considerations of aposematism and Batesian mimicry in grasshoppers and katydids, this chapter contains essential errors of identification of the orthopteran species he discusses.