The life- cycle, the behavior of the butterfly and the caterpillars, the courtship-flight, mating, the egg- laying, the hatching of the eggs, the larval food-plant, the Baldder senna (Colutea arborescens), the myrmecophily caterpillars and the parasitoids of the butterfly The Iolas Blue has been filmed in the Var, France. Family of Lycaenidae.
. Comportement et vol nuptial de Iolana iolas (Ochsenheimer, 1816)
Myrmecophily
Caterpillars from the Iolas Blue (Iolana iolas), feeding inside a damaged Colutea arborescens bladder are visited by ants of the genus Lasius attracted by the honey dew from a gland called; the dorsal nectar organ (DNO), or Newcomer's gland.
Parasitoids
The parasitoid wasp Anisobas cephalotes (Kriechbaumer, 1882) (Hymenpotera: Ichneumonoidea) is a specialist only parasitizing the caterpillars of Iolas Blue (Iolana iolas) that lives inside the bladder of the Bladder senna (Colutea arborescens). After it has detected a caterpillar inside a bladder it will bite a hole in the bladder and enters the bladder and parasitize the caterpillar with one single egg. The wasp larva develops inside the caterpillars body. The next spring, after the caterpillar had become a chrysalis during the summer, a new Anisobas cephalotes hatch from the dead Iolana iolas chrysalis.
Identified by Dr. Mark R. Shaw
L'Azuré du baguenaudier 
Iolas Blue 
Fleeting wonders
Butterflies of France 
Lepidoptera & their ecology
Matt's European Butterflies
Anything but common 
Lépi'Net