Electroantennograms were recorded from 8 noctuid moths representing 4 subfamilies and from a sphingid in response to stimulation with male scent scales. Four noctuids, Trichoplusia ni (Hübner), Heliothis virescens (F.), Pseudaletia unipuncta (Haworth), and Leucania sp. and the sphingid, Manduca sexta (Linneaus), responded to the scent brushes from their own males but 3 noctuid species, Anagrapha falcifera (Kirby), Heliothis zea (Boddie), and Spodoptera ornithogalli (Guenée), did not respond to the supposed scent scales of their own males. All 8 of these species and Autographa precationis Guenée responded to the hairpencils of T. ni, and all of the 6 species challenged with P. unipuncta scent brushes also responded. EAGs of comparable size were produced in both male and female antennae by these scales. The apparent lack of species specificity in antennal responsiveness to the scent scale secretions was explained by assuming that the nonspecific odor generalist olfactory cells on the antenna were stimulated.