PLATE 3.22. DRONE WING HOOKS

BOTTOM LEFT. Leading edge of the hind wing The hooks engage the posterior margin of the forewing only during flight, when the forewing and hind wing beat as one. Microtrichia are abundant over the wing surface. (x 136)

BOTTOM RIGHT. Non-hook-bearing portion of the hind wing in the bottom left micrograph. Socketed hairs, both long and very short, project from this vein. ( x 800)

TOP RIGHT. Photorriontage of the ventral forewing hind margin, around which the hooks engage, and the hooked leading edge of the hind wing. (x 110)

TOP LEFT. Close-up of the wing hooks. These are somewhat larger than those of the worker. Socketed small peg organs are abundant on the surface engaged by the trailing edge of the forewing. (x 720)