none Hypera postica; HYMENOPTERAN-PARASITES; Bathyplectes curculionis; Parasitoid diel emergence patterns; PHOTOPERIOD-; Hymenopteran parasitoid diel emergence pattern relations; UTAH-; Cache Valley; Hymenopteran parasitoid diel emergence patterns, photoperiod relations Bathyplectes curculionis; EMERGENCE-; Diel patterns; CIRCADIAN-ACTIVITY; COLEOPTERAN-HOSTS; Hypera postica; Parasitoid diel emergence patterns; PHOTOPERIOD-; Diel emergence pattern relations; UTAH-; Cache Valley; Diel emergence patterns, photoperiod relations Diel emergence patterns of adult Bathyplectes curculionis, an introduced parasite of the alfalfa weevil, were investigated at two photoperiods, 14L:10D and 10L:14D, at 20 degree C in the laboratory. Emergence at each photoperiod occurred in a specific time interval (emergence gate) that began around dawn and continued for four hours. Male and female wasps had the same emergence gate. The emergence gate at 14L:10D, the more natural photoperiod, occurred slightly later than the emergence gate of the shorter photophase.