Abstract
The effects of 24L:0D and 12L:12D photoperiods on shoulder shape and number of midventral abdominal spots in Gainesville, Fla., adults of Euschistus tristigmus (Say) were studied under laboratory conditions. Adults reared in the 24L:0D photoperiod had spinose shoulders, those in the 12L:12D photoperiod, subspinose shoulders. Most males reared in the 24L:0D photoperiod had 0–2 spots; females, 0–4 spots. Both sexes had 3–4 spots when reared in the 12L:12D photoperiod. Comparisons of laboratory-reared Gainesville adults with southern Illinois adults showed a slight difference in the range of variation in shoulder shape and number of spots. The Gainesville range of variation in these 2 characters fell within that of the southern Illinois population.
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