The effects of constant and changing photoperiod on nymphal development are investigated to understand the seasonal life-cycle strategy of a nymph-overwintering cricket, Velarifìctonus ornatus, in Zhuzhou, Hunan. Nymphal development was slow under constant photoperiods at 25°C. The shortest mean duration of nymphal development was (206.2±44.0) (mean±SD) days at LD 16:8 h, followed by (230.3±47.4) days at LD 12:12 h and (236.5± 93.3) days at LD 14:10 h. No significant difference was observed in the nymphal durations among different constan...