Archivio di Psichiatria, 1902, fasc. ii-iii, p. 338. In the case of pathological sexuality in a boy of 15, reported by A. MacDonald, and already summarized, the sight of copulating flies is also mentioned among many other causes of sexual excitation.
Krafft-Ebing presents or quotes typical cases of all these fetiches, Op. cit., pp. 255-266.
G. Stanley Hall, "A study of Fears," American Journal of Psychology, 1897, pp. 213-215.