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mdash; The pigmentation of the scutellum, sclerites of the 3rd and 4th tergites, and the abdominal ventral side of Japanese honey bee workers was examined. A predominantly yellow (summer) type of worker appeared from August to October, whereas a black (winter) type appeared from late October to May. The pigmentation grades differed among colonies collected from different regions of Japan. When pupae were kept at 25-!8°C in the laboratory, the resultant adult pigmentation was affected. The yellow type appeared at temperatures higher than 34°C, and the black type appeared at temperatures lower than 30°C. The temperature at several places in a colony was measured using microthermistors. At the central brood area, it was consistently 33—34°C and the peripheral area fluctuated from 30° to 34°C. The seasonal colour variation in the Japanese honey bee in relation to the accuracy of thermoregulation in the brood area is discussed.

Temperature as a causative factor in the seasonal colour dimorphism of Apis cerana japonica workers