♂, Phrae, Thailand.		♀, Phrae, Thailand.
♂, Phrae, Thailand.		♀, Phrae, Thailand.

ON : Zeuxidia masoni Moore, 1879 OD : Proc. zool. Soc. Lond. 1878(4):826. TL : "Meetan" [Kayin State, Myanmar]. Distribution : Myanmar, N. & W.Thailand. ● ssp.masoni ● ssp.??? (uncertain) ● ssp.tannowai

[ THAILAND ]
Zeuxidia amethystus masoni ; Godfrey,1930 : 260. (Prae: Me Song forest; Me Lamoung: Hot Spring)
Zeuxidia masoni masoni ; Kimura et al.,2016 : 147, figs.♂,♂(Un),♀,♀(Un). (Bang Salock)
'Zeuxidia masoni masoni ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs. (Phetchabun) (accessed: 2023.06.03)'

[ THAILAND ]
Phrae : 2♂ 2♀.

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Phetchabun : 2♂ (photo by S.Sophonviwatkul and A.Giudici).

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The butterfly is locally uncommon in montane dense forests mixed with bamboo at moderate elevations (Alt. 400 - 900m).
Photo records in Phetchabun prov. were taken by Supat Sophonviwatkul and Antonio Giudici. However, due to the lack of specimen, it was not possible to identify which subspecies. I suppose it is likely to be this taxon, but we need to confirm with specimens in the future.

The difference between masoni and ametystus
masoni ♂, UpH. brand without hairtuft in cell	ametystus ♂, UpH. brand with hairtuft in cell

Moore, F.,1879 : A list of the lepidopterous insects collected by Mr.Ossian Limborg in upper Tenasserim, with descriptions of new species.
Proc. zool. Soc. Lond. 1878(4):821-858, pls. 51-53.

♂, Phetchabun, Thailand. (photo by S.Sophonviwatkul)	♂, Phetchabun, Thailand. (photo by A.Giudici)

2007.10.10 - 2025.03.31.