androconium

(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 ... ...
Found on http://www.britannica.com/eb/a-z/a/72

androconium

androconium, androconial Scales on the wings of certain male Lepidoptera (butterflies) from which the attractive scent of the male is diffused.
Found on http://www.wordinfo.info/words/index/info/view_unit/2779/

androconium

Specialized scale that produces pheromones
Found on http://butterflywebsite.com/articles/glossary.cfm
No exact match found