What are male honeybees called?

A drone is a male bee that is the product of an unfertilized egg. Unlike the female worker bee, drones do not have stingers and do not gather nectar and pollen. A drone's primary role is to mate with a fertile queen.

Because the male bee technically has only a mother, and no father, its genealogical tree is rather interesting. The first generation has one member (the male). One generation back also has one member (the mother). Two generations back are two members (the mother and father of the mother). Three generations back are three members. Four back are five members. That is, the numbers in each generation going back are 1, 1, 2, 3, 5, 8, ... ‍—‌the Fibonacci sequence.

A drone is characterized by eyes that are twice the size of those of worker bees and queens, and a body size greater than that of worker bees, though usually smaller than the queen bee. His abdomen is stouter than the abdomen of workers or queen. Although heavy bodied, the drone must be able to fly fast enough to accompany the queen in flight. Mating occurs in flight, which accounts for the need of the drones for better vision, which is provided by their large eyes. Should a drone succeed in mating, he soon dies because the penis and associated abdominal tissues are ripped from the drone's body after sexual intercourse. The leftover penis remaining in the queen’s vagina is referred to as the “mating sign”. The plug will not prevent the next drone from mating with the same queen.