The pheromone, located on the dorsal surface of the hindwing, consists of cuticular hydrocarbons n-heptacosane (C27), 13-methylheptacosane (13-MeC27), and possibly n-nonacosane (C29).
ðə fˈɛɹəmˌoʊn, loʊkˈeɪɾᵻd ɔnðə dˈoːɹsəl sˈɜːfɪs ʌvðə hˈɪndwɪŋ, kənsˈɪsts ʌv kjuːtˈɪkjʊlɚ hˈaɪdɹəkˌɑːɹbənz ˈɛnhˈɛptɐkˌɑːseɪn sˈiː twˈɛnti sˈɛvən, θˈɜːtiːnmˈɛθəlhˌɛptɐkˌɑːseɪn θˈɜːtiːnmˌiː sˈiː twˈɛnti sˈɛvən, ænd pˈɑːsᵻbli ˈɛnnˌɑːnˈækəsˌeɪn sˈiː twˈɛnti nˈaɪn.