Storage of pupae ofAnticarsia gemmatalisHübner in a freezer maintained at −20°C for 150–250 d did not affect the ability of the chalcididBrachymeria ovata(Say) to recognize them as hosts. Odors from live and freezer-stored pupae elicited significant olfactory and behavioral responses byB. ovata. When offered either 10 live pupae or 10 freezer-stored pupae,B. ovataparasitized significantly more (about twice as many) of the live pupae. However, when offered both five live and five freezer-stored pupae together,B. ovataparasitized, on the average, 16 times more of the live pupae. When presented with a choice between a freezer-stored pupa and a live pupa using a Y tube olfactometer,B. ovatashowed a significant olfactory preference for the live pupa. When presented with a choice between a freezer-stored pupa and a blank cell,B. ovatawas attracted to the freezer-stored pupa. Approximately the same length of time was required forB. ovatafemales to locate a live pupa as that required to locate a freezer-stored pupa when each pupal type was offered alone.