Escher's Blue, Plebicula escheri (syn: Polyommatus escheri and Agrodiaetus escheri), is from Mediterranean Europe. It is commonly seen in southern Europe in foothill or mountain habitats. These butterflies prefer rocky or sandy areas and in Greece will colonize the rocky margins of highways. The larval food plant is Astragalus monspesullanus or Milk Vetch.
Males have baby-blue upper wings with black margins and a white fringe. Females have brown upper wings with orange lunules. The undersides of their wings are similar: gray with white-bordered black spots and black-bordered orange chevrons around their margins. These blues look similar to other species of blues in different respects, so it can take some care to distinguish them.
- Branko, M; Nikola, M; Rudi, V. (2009). New records of the rare Escher's Blue, Polyommatus escheri (Lepidoptera: Lycaenidae), from the Republic of Macedonia. Phegea; 37(2):69-73.
- Coombes, S. (2014). Escher's blue. Retrieved from Captain's European Butterfly Guide: http://www.butterfly-guide.co.uk/species/blues/pyr6.htm
- Gibbons, R. (2013). Escher's blue. Retrieved from the Butterflies of France website: http://www.butterfliesoffrance.com/html/Polyommatus%20escheri.htm
- Rowlings, M. (2011). Agrodiaetus escheri. Retrieved from Eurobutterflies.com: http://www.eurobutterflies.com/species_pages/escheri.htm