Specialized scale that produces pheromones
(from the article `lepidopteran`) ...of characteristic colours and patterns may be a requisite for this among the brightly coloured butterflies. Male pheromones also may play an ... ...The usual scale is a flattened, rigid, air-filled sac attached by a peglike base. It is usually ribbed longitudinally and toothed terminally. Many ... ...
androconium, androconial Scales on the wings of certain male Lepidoptera (butterflies) from which the attractive scent of the male is diffused.
a scale on the forewing of certain male butterflies from which an odor attractive to females is emitted.