“…A few other chrysanthemumates, geraniol, curlure (4-(p-hydroxyphenyl)-2-butanone acetate), siglure (1-methylpropyl trans-6-methyl-3-cyclohexane), 2,5-dimethyl-2,4-hexadiene, isopentyl and phenethyl butyrate, trans-2-hexenal, butyl and pentyl hexanoate were much less attractive in field experiments (BARBER et al 1971, VANDERMEER et al 1979). Pheromones of Oryctini are known only from the above-mentioned two species: a male aggregation pheromone, ethyl-4-methyloctanoate, and a further attractive substance, ethyl-4-methylheptanoate (GRIES et al 1994, HALLETT et al 1995, MORIN et al 1996, RENOU et al 1998. Recently, RENOU et al (1998) found olfactory receptor cells in the antennae of female 0. rhinoceros for ethyl-4-methyloctanoate, phenyl ethanol, phenol, phellandrene, isoamyl acetate, Z3-hexenol, and ethyl chrysanthemumate.…”