The longevity and development of body weight and hypopharyn‌geal glands of honeybee workers of F1 Camiolan F1 Caucasian and F1 Italian were studied during two successive winter seasons 1994/1995‌1995/1996. Summarized data were as follows: 1- The LT so and LT 90 for the workers of F1 Carniolan, F1 Cau‌casian and F1 Italian recorded (37.5, 58.5), (33.55, 53.89) and (31.78, 54.53), respectively. 2- The least body weight of honeybee workers of the three hy-brids were recorded for the newly emerged workers. Then, it increased gradually until reached the heaviest weight on the 14th day of age re-cording 109.7,114 and 106.7 mg. for F1 Camiolan F1 Caucasian and F1 Italian, respectively. Thereafter, the weights started to decrease gradu‌ally. However, the highest weights were recorded for F1 Caucasian work‌ers. 3- Similarly, the least development of hypopharyngeal glands (length, width and surface area of the gland acinus) was recorded for newly emerged workers. Whereas the highest measures of the three pa‌rameters were recorded for 7 days old workers that followed by a noti‌ceable reducing of the gland development on the 14th day before it in‌creased again on the 21th day of workers age. However, Fl Carniolan, workers showed the highest gland development, whereas F1 Caucasian ones manifested the least hybrid development in general. Carniolan hy‌brid was the best.