Tarrier, M. (2024): The Lycaenidae of Morocco (Rif, Oriental Region, Central Plateau, Middle Atlas, High Atlas, Anti-Atlas, Sahara). An updated and annotated monography.
To this day only known from the original types from the eastern Middle Atlas, captured in June 1928, either in Tizi-Tiskine (which does not belong to Djebel Ahmar as indicated by the descriptor, but to the northern foothills of Djebel Bou-Iblane), or in Djebel Ahmar itself and a little further north-east, on the borders of Djebel Tazekka, according to our contemporary maps. The description "from Moussah ou Salah a Tizi Tkrine, June 18, 1928" of certain labels should attest to a Bou-Iblane origin, but others mention "Djebel Ahmar, June 29". These mountains, of fairly easy access and with many favourable biotopes still in existence, have been propospected with a fine comb by several lepidopterists but so far no Polyommatus escheri could be observed here, or nowhere else in Morocco. The types preserved at the National Museum of Natural History in Paris (where the males seemed to have disappeared during my last visit in November 2005), the British Museum in London, and the Scientific Institute in Rabat, attest to the validity of this taxon.
