ON : Aporia agaton biana Nakamura, 2025 OD : Butterflies 96: 28-30, figs.1A(HT,♂), 1B(PT,♂). TL : Phou Bia, alt.1300m, Xaysomboune, C.Laos. (RIEB) Distribution : Laos.

Holotype ♂, 29.Mar.2007, Phou Bia, alt. 1300m, Xaysomboune, C.Laos. (RIEB)
Paratypes : 5♂, same locality as holotype; 3♂, 45km west of Kasi, Luang Prabang, C.Laos.

[ THAILAND ]
'Aporia agathon agathon ; Godfrey,1932b : 322. (N.E: 1♂, 21.May.1932. Chiet, "Kemarat" [Khemmarat])'
'Aporia agathon agathon ; Pinratana,1983 : 10,33, pl.9, fig.14,♂,♂(Un). (Ubon Ratchathani)'
'Aporia agathon agathon [Aporia omotoi] ; Ek-Amnuay,[2007] : 136, pl.40, figs.Pi14a♂(Kachin,Myanmar),♂(Un,Kachin,Myanmar).'
'Aporia agaton bifurcate [sic] ; Ek-Amnuay,[2007] : 136, not fig. (list only)'
'Aporia agaton bifurcata ; Kimura et al.,2011 : 165. (by literature)'
'Aporia agathon bifurcata [Aporia omotoi] ; Ek-Amnuay,2012 : 136, pl.40, figs.Pi14,♂(Kachin,Myanmar),♂(Un,Kachin,Myanmar).'

[ LAOS ]
Aporia agaton bifurcata ; Nakamura & Wakahara,2012 : 42, pl.1, figs.Pi-12,♂,♂(Un). (Phou Bia)
Aporia agaton ssp. ; Inayoshi,2015-2022 : Butterflies in Indo-China. (by literature) (31.May.2022 last updated; 30.Apr.2025 changed.)

Godfrey (1932) recorded Aporia agathon from Thailand. Only a single specimen is known, said to have been collected by A.F.G.Kerr on 21.May.1932 from "Chiet, Kemarat, NE. Siam" [Chiet, Khemmarat, NE. Thailand]. But this is rather doubtful. This specimen appears to be closer to the nominotypical subspecies. It is considered very likely that the specimen is from other regions.
The specimen shown in Ek-Amnuay ([2007],2012) is Aporia omotoi from Kachin, Myanmar.

Yoshino, K.,2015 : Notes on Aporia agathon (Gray) (Lepidoptera: Pieridae) from N.E.India, West China and North Vietnam.
Butterfly Science 2: 25-28.

Hu, S.J., Jia, Y.Q., Zhang, X., Hsu, Y.F., Monastyrskii, A.L., Vu, V.L., Ge, S.X., Duan, K., Jiang, Z.H., Sbordini, V. & Wang, M.,2024 :
Disentangling taxonomic confusions in the Aporia agathon group using mitochondrial genomic data (Lepidoptera: Pieridae).
Insects 15(998): 1–46.

Nakamura, N.,2025 : Notes on the butterflies of Laos (XIII): descriptions of four new subspecies.
Butterflies 96: 28-37.

2025.04.30.