According to a note made by Baron de Sélys Longchamps, Wesmael gave his Braconidae to Mr. Haliday, without knowing however that this Irish scientist would be later established in Italy, and that after his death his collection would pass via Edward Perceval Wright to Dublin Museum.
Hesitating about his decision to give his collection of Ichneumonidae to the British Museum of Natural History he finally entrusted it to Royal Belgian Institute of Natural Sciences.