from The Century Dictionary and Cyclopedia
- Certain specialized scales oscurring in limited areas on the wings of the males of certain Lepidoptera.
Sorry, no etymologies found.
Males of many species have patches of specialized scales called androconia on their wings, thorax, or abdomen that release pheromones.
To the best of their ability, the male does a special dance for the female releasing pheromones form the androconia on his abdomen, wings, and thorax that introduce the female to mating.
The female also has some androconia, but only on the abdomen. this whole courtship ritual is brief and includes a lot of antenna action and flying around in the pheromones.