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Published online by Cambridge University Press: 31 May 2012
In my “Hawk Moths of North America,” I have assumed that the caudal horn is a prolongation of the skin itself, stiffened by chitine (p. 41). It supports a bristle, or pair of bristles, and Dr. W. Müller, whose valuable work on the Nymphalidœ of South America in their larval stages (Zoologischen jahrbuchern, 1886.) I have noticed in these pages, figures the horn of Dilophonota, p. 249, and regards it as a prolongation of the base supporting the two normal bristles of the eleventh segment.