With others like the tsetse fly Glossina morsitans morsitans, the pheromone contains the four alkanes 2-methylheptadecane (C18H38), 17,21-dimethylheptatriacontane (C39H80), 15,19-dimethylheptatriacontane (C39H80) and 15,19,23-trimethylheptatriacontane (C40H82), and acts by smell over longer distances.
wɪð ˈʌðɚz lˈaɪk ðə tsˈɛtsi flˈaɪ ɡlˈɔsɪnə mˈɔːɹsɪtənz mˈɔːɹsɪtənz, ðə fˈɛɹəmˌoʊn kəntˈeɪnz ðə fˈoːɹ ˈælkeɪnz tˈuːmˈɛθəlhˌɛpteɪdkˌeɪn sˈiː ˈeɪtiːn ˈeɪtʃ θˈɜːɾi ˈeɪt, sˈɛvəntˌiːn,twˈɛnti wˈʌndˈaɪmθɪlhˌɛptɐtɹˌɪɐkˌɔnteɪn sˈiː θˈɜːɾi nˈaɪn ˈeɪtʃ ˈeɪɾi, fˈɪftiːn,nˈaɪntiːndˈaɪmθɪlhˌɛptɐtɹˌɪɐkˌɔnteɪn sˈiː θˈɜːɾi nˈaɪn ˈeɪtʃ ˈeɪɾi ænd fˈɪftiːn,nˈaɪntiːn,twˈɛnti θɹˈiːtɹˈaɪmɪθəlhˌɛptɐtɹˌɪɐkˌɔnteɪn sˈiː fˈoːɹɾi ˈeɪtʃ ˈeɪɾi tˈuː, ænd ˈækts baɪ smˈɛl ˌoʊvɚ lˈɔŋɡɚ dˈɪstənsᵻz.