Opisina arenosella; HYMENOPTERAN-PARASITES; Humidity preferences of different parasitoid species, comparative study Antrocephalus hakonensis; ORIENTATION-; Behavioural responses to humidity gradient; HABITAT-PREFERENCE; Humidity relationship, comparative behavioural responses; Parasitoids of Opisina arenosella (Lepidoptera); HUMIDITY-; Gradient, behavioural responses; Comparison with other parasitoids of Opisina arenosella (Lepidoptera) Brachymeria nosatoi; Bracon brevicornis; Goniozus nephantidis; HABITAT-PREFERENCE; Humidity, behavioural response, comparative study; Parasitoids of Opisina arenosella (Lepidoptera) The behavioural responses of Antrocephalus hakonensis (Ashinead) to humidity were tested and compared to those of Brachymeria nosatoi Habu (Hymenoptera: Chalcididae), Bracon brevicornis Wesmael (Hymenoptera: Braconidae) and Goniozus nephantidis (Muesebeck) (Hymenoptera: Bethylidae). A. hakonensis and B. nosatoi preferred lower humidities than the other parasitoids. These findings have relevance to the habitat preference of the parasitoids. none