Seq # 460050030

Satyrium w-album (Knoch, 1782) Species

Last modified: March 15, 2022, 9:53 a.m.

A local and very rare species in Belgium, most observations are from the southern part of the country. Populations have drastically declined because of the Dutch elm disease. Threatened.


Family: Lycaenidae > Subfamily: Theclinae > Tribus: Eumaeini > Genus: Satyrium > Species: Satyrium w-album
Vernacular names
Iepenpage (NL), White-letter Hairstreak (EN), Thècle de l'orme (FR), Ulmen-Zipfelfalter (DE)
First mention in Belgium
De Sélys-Longchamps E. 1837. Catalogue des Lépidoptères ou Papillons de la Belgique, précédé du tableau des Libellulines de ce pays. — — : 1–29. On page 16 (as Polyommatus W-Album). view page




Museum specimens

No pictures yet!

Specimens in nature

Flight periods

The adults fly from mid June till the beginning of August.

Observed on

Host plant (species):
Ulmus glabra
Host plant (genera):

The larva lives on Ulmus. Hibernates as egg.

No pictures yet!