Abstract
The pyrrhocorid bug, Pyrrhocoris sibiricus, which is a ground-dwelling seedfeeder, shows wing polymorphism producing brachyptery and macroptery. This study was undertaken to investigate nymphal periods of the two wing morphs, which were derived from two lines artificially selected for different wing forms, at 20°C and 30°C under 12L-12D. No macropters appeared from either selected line at 20°C. At 30°C, however, only the macropterous-selected line produced macropters. Nymphal period of brachypters was longer in the macropterous-selected line than in the brachypterous-selected line. This result suggests that the selection for wing form affects not only wing form but also nymphal period. No significant difference in the nymphal period was shown between the two wing morphs in the macropterous-selected line at 30°C.
