Part 5 of the Lycaenidae subseries describes the butterfly genera Chilades, Lachides, Rueckbeilia, Patricius, Pamiria, Freyeria, Alpherakya, Glabroculus, and Arianna from the tribe Polyommatini. These tiny insects are known for their spectacular natural behaviour, where hundreds of individuals gather in the early mornings with shiny blue wings open to catch the rays of the sun, for what is called "thermoregulation", for mud-puddling on moist ground in the hottest hours and days, or conversely, for resting with wings closed in hollowed out places for the night, where humidity refreshes their delicate bodies.