The Holly Blue (Celastrina argiolus, wingspan 23 - 30 mm), is a small moth of the family Lycaenidae with obvious sexual dimorphism.
Males are with blue /violet upper wings and thin margins blacks, the female has dark edges of the wings larger than the male;
the pages of the lower wings are gray / light blue with small ocelli blacks sometimes evanescent, and basal area green blue.
Flight from lively, often remains laid between the fronds and bushes and trees. It's bivoltine or trivoltine with flicker from March to August.
The eggs are laid in the spring mostly on the holly, and in summer on ivy. The caterpillars are green with sometimes shades of yellowish, dorsally present a series of drawings
triangular reddish. They give rise to phenomena of symbiosis with ants of genus Lasius. The pupae of the second deposition are wintering.
Its range spans Europe, Asia and North America. In our continent present everywhere except Scotland and northern Scandinavia. Common in Italy, from the plains to 1500 m .;
from us easily observable at hedges and wooded glade. Other hosts: Hederea helix, Rubus, Rhamnus, Cornus sanguinea, Ilex aquifolium, Frangula alnus, Evonymus europaeus, Erica, Calluna.