♂, 2014.09.--. Dambri, Bao Loc, Lam Dong, Vietnam. Holotype (photo by K.Saito)		♂, 2014.11.--. Da Ton, Bao Lam, Lam Dong, Vietnam. Paratype (photo by K.Saito)

♀ of Horaga amethystus nishiharai or Horaga purpurescens detanii ?
♀, 2016.02.--. Lam Dong, Vietnam. (photo by K.Saito)		♀, 2014.01.24. Trat, Thailand. (photo by E.Ikari)

ON : Horaga purpurescens detanii Saito & Inayoshi, 2026 OD : Butterflies 98:15, fig.9a(♂genitalia), 20a(HT,♂), 20a-v(HT,♂Un), 20b(PT,♂), 20b-v(PT,♂Un), 20c(PT,♂), 20c-v(PT,♂Un), 20d♂,♂(Un). TL : Dambri waterfalls, Bao Loc, Lam Dong, C.Vietnam. (RIEB) Distribution : S.Laos, C.Vietnam. [S.E.Thailand ?] ● ssp.detanii ● unclear (purpurescens or amethystus) ● ssp.purpurescens

Holotype, ♂, Jan.2018, Dambri waterfalls, Bao Loc, Lam Dong, C.Vietnam, Dang Ngoc Van leg. (RIEB)
Paratypes (5♂): same locality as holotype: 2♂, Jan.2018, D.N.Van leg. (KS); 1♂, Nov.2016, D.N.Van leg. (KS);
2♂, Nov.2014, Da Ton, alt.1,000m, [Bao Lam], Lam Dong, C.Vietnam, D.N.Van leg. (KS).

[ LAOS ]
Horaga amethysta purpurescens ; Nakamura et al.,2009 : 24-25, figs.5,♂,♂(Un). (Attapeu)
Horaga amethysta purpurescens ; Nakamura & Wakahara,2012 : 55, pl.21, figs.Ly-216,♂,♂(Un). (Attapeu)

[ VIETNAM ]
Horaga amethystus purpurescens ; Saito & Inayoshi,2018 : 35-36, figs.80,♂,♂(Un),81,♀,♀(Un). (Lam Dong)

[ VIETNAM ]
Lam Dang : 6♂ (Holotype and Paratypes).

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[ Presumably the female of Horaga purpurescens detanii ]

[ THAILAND ]
Trat : Koh Kut, 2014.01.24. 1♀, E.Ikari (EI).

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[ VIETNAM ]
Lam Dang : Da Ton, Bao Lam, 2016.02. 1♀, (KS).

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The butterfly is uncommon in montane forsts at moderate elevations (Alt. 850-1000m).
The female of this taxon is unclear. Further taxonomic and distributional studies are needed.

As illustrated above, female specimens of either amethystus or purpurescens have been obtained from Vietnam and S.E. Thailand. The female specimen from S.E. Thailand was collected by Etsuo Ikari on Koh kut in Trat Province. However, identification is provisionally withheld until comparative specimens are available to confirm it with certainty.

Saito, K. & Inayoshi, Y.,2026 : Notes on Horaga amethystus H. H. Druce, 1902 and its allies (Lepidoptera, Lycaenidae, Lycaeninae).
Butterflies 98:4-19.

2026.03.31.