ON : Euploea swainson emigrantus Monastyrskii, 2012 OD : Atalanta 43(1/2): 158, fig.2a(♂genitalia), pl.2, figs.1(HT,♂), 2,♀. TL : Con Son Island, S.Vietnam. (NHML) Distribution : S.Vietnam (Con Son Is.)

Holotype ♂, 11.Jun.2010, S.Vietnam, Ba Ria - Vung Tau Province, Con Son Island, road to Thanh Gia top, -250m, A. Monastyrskii leg. (NHML)
Paratypes : 11♂ 9♀, Con Son Is., S.Vietnam.

[ VIETNAM ]
Euploea algea ssp.: Ackery & Vane-Wright,1984 : 122. (S: Con Son Is. (Pulo Condore))
Euploea swainson ssp.: Monastyrskii,2011 : 58–60, pl.9, figs.1a♂,1b♂(Un),1c♀. (S: Con Son Is.)
Euploea swainson emigrantus: Monastyrskii & Devyatkin,2015 : 19, pl.2, figs.6a(PT,♂),6b(PT,♀). (S: Con Son Is.)

Ackery, P.R. & Vane-Wright, R.I, 1984. Milkweed Butterflies, Their Cladistics and Biology : Being an Account of the Natural History of the Danainae, a Subfamily of the Lepidoptera, Nymphalidae.
British Museum (Natural History), London, 425 pp.

Monastyrskii, A.L, 2012. New Taxa and new records of butterflies from Vietnam (4) (Lepidoptera, Rhopalocera).
Atalanta, 43(1/2): 156–164.

2023.03.31 - 2025.04.30.