♂ (wsf), Sekong, Laos.

ON : Neurosigma siva dalatica Yoshino, 2017 OD : Butterfly Science 7:27-29, figs.5(HT,♂),6(HT,♂Un). TL : Dalat, Mt.LangVien, Lam Dong, S.Vietnam. (♂, NHML) Distribution : S.Laos, C.Vietnam. ● ssp.nonius ● ssp.dalatica

Holotype ♂, Apr.2016. Dalat, Mt.Lang Vien, alt.1900m, Lam Dong, S.Vietnam. (NHML, photo examined)
Paratypes ; 2♂, Same data as holotype. (in coll. K.Yoshino)

[ LAOS ]
Neurosigma siva nonius ; Osada, Uémura & Uehara,1999 : 207, pl.62, fig.♂. (Thateng) (in part)

[ VIETNAM ]
Neurosigma doubleday nonius ; Metaye,1957 : 97. (C)
Neurosigma siva nonius ; Miyazaki, Saito & Saito,2006b : 26, fig.N-79,♂. (Lam Dong: Dambri)
Neurosigma siva orientale ; Yokochi et al.,2015 : 41, figs.63,♂,63v♂(Un). (Khanh Hoa: Hon Ba)
Neurosigma siva nonius ; Monastyrskii & Devyatkin,2015 : 39. (C: to Lam Dong) (in part)
Neurosigma siva nonius ; Monastyrskii,2019 : 4(2):99-100, pl.56, figs.3a♂,3b♂. (C: Huong Son; Vu Quang; Kon Ka Kinh; Chu Yang Sin; Hon Ba) (in part)

[ LAOS ]
Sekong : 1♂.

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This taxon has two conspicuous seasonal forms like the nominotypical subspecies. However, ssp.nonius doesn't have a wet season form.

Yoshino, K.,2017 : Description of 3 New Subspecies from Central and Southern Vietnam
Butterfly Science 7:25-31.

2020.10.31 - 2022.12.26.