This butterfly is quite rare around Ottawa as it is associated with the hackberry tree (Celtis occidentalis) which is also fairly rare in Ottawa. However, the Petrie Islands have a nice mature hackberry stand and over the last few years this species has been found there almost annually. A few days ago it was reported for the first time this year from Petrie, so this morning I went off in search of it and after a relatively easy search, found this single individual.