Abstract
Polygyny and nuptial flight were observed in a supercolony of a Japanese red wood antFormica (Formica) yessensis Forel at Ishikari Coast, Hokkaido, Japan. The main results are: 1. The vertical distribution of queens in nests seasonally fluctuated, preferring deeper parts (mainly 40 to 60 cm below the ground surface) in hibernation season but shallower parts (10 to 40 cm) in summer. This fluctuation was significantly correlative with that of the vertical distribution of workers except mid July to prehibernation season. 2. In nests the queens tended to aggregate with each other at same chambers without hostility. They all had developed ovaries in egg laying season. 3. Abundant sexuals were produced in the average year, but occasional absence of such mass production was also possible. 4. The inseminated new queens tended to return to the mother colony, while most virgins tried to fly away.
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