♂, Chiang Mai, Thailand.		♀, Chiang Mai, Thailand.
♂, Chiang Mai, Thailand.		♂, Chiang Mai, Thailand.
♂, Ranong, Thailand.		♂ genitalia, Chiang Mai, Thailand.

ON : Prosotas pia marginata Tite, 1963 OD : Bull. Br. Mus. nat. Hist. (Ent.) 13(4):94, pl.1, figs.16,♂, 17,♂(Un). TL : Kirbari, Naga Hills, [NE.India]. (NHML) Distribution : Nepal, India (Sikkim ; Assam), Myanmar, Thailand, Laos, Cambodia, Vietnam, Yunnan.

Holotype ♂, Rh.16589, 10-24.Jul.1912. Kirbari, Naga Hills, Assam. Tytler. (NHML)
Allotype ♀, Rh.16590, 21.May.1911. Imphal, Manipur, Assam. Tytler. (NHML)

[ THAILAND ]
Prosotas pia marginata ; Pinratana,1981 : 66, pl.11, fig.2,♂(Un). (Chiang Mai; Kanchanaburi; Nakhon Nayok)
Prosotas pia marginata ; Yamaguchi, Aoki & Akiyama,2005 : 54, fig.27,♀. (Ubon Ratchathani: Phu Chong Na Yoi)
Prosotas pia marginata ; Ek-Amnuay,[2007] : 584, pl.265, figs.L144,♂,♂(Un),♀,♀(Un). ('Wang Chin; Wiang Pa Pao; Trat')
Prosotas pia marginata ; Ek-Amnuay,2012 : 608, pl.275, figs.L169,♂,♂(Un),♀,♀(Un). ('Wang Chin; Wiang Pa Pao; Trat')
Prosotas pia marginata ; Kimura et al.,2014 : 163, figs.♂,♂(Un),♂,♂(Un),♂,♂(Un),♀,♀(Un),♀,♀(Un). (Doi Pha Hom Pok; Doi Chiang Dao; Chiang Mai; Doi Suthep; Doi Pa Chang; Wan Nam Khiewo; Kao Poh Ta)
'Prosotas pia marginata ; Küppers & Janikorn,2020 : 167, figs.Abb.L-218-219. (Phang Nga)'

[ LAOS ]
Prosotas pia marginata ; Motono & Negishi,1989 : 73, pl.104, figs.A1,♂,A2,♂(Un). (Phatong)
Prosotas pia marginata ; Osada, Uémura & Uehara,1999 : 215, pl.111, figs.♂,♂(Un). (Phatong)
Prosotas pia marginata ; Nimura & Wakahara,2005 : 46. (Namdhua)
Prosotas pia marginata ; Nakamura & Wakahara,2012 : 52.

[ CAMBODIA ]
Prosotas pia marginata ; Monastyrskii et al.,2011 : 130. (Phnom Samkos W.S.)
Prosotas pia marginata ; Chartier & Kosterin,2022 : 121. (Pursat)

[ VIETNAM ]
Prosotas pia marginata ; Miyazaki, Saito & Saito,2006d : 57, figs.L-61,♂. (Lam Dong: Dambri; Gung Re; Madagui) (in part)
Prosotas pia marginata ; Saito et al.,2017 : 79. (S: Nui Cam)
Prosotas pia marginata ; Monastyrskii & Devyatkin,2015 : 54. (C)

[ THAILAND ]
Mae Hong Son : 1♂.

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Chiang Mai : 7♂ 1♀.

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Ranong : 1♂.

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The butterfly is locally not rare in montane forests at moderate to high elevations (Alt. 1000 - 1600m). Males are territorial on trees at hilltops.
Very similar to Prosotas nora and almost indistinguishable from the underside. The color and markings on the upper side or the male genitalia need to be examined.

Tite, G.E.,1963 : A Synonymic List of the Genus Nacaduba and Allied Genera (Lepidoptera: Lycaenidae).
Bull. Br. Mus. nat. Hist. (Ent.) 13(4):69-116, 91 tf, 2 pls.

1999.07.11 - 2023.09.30.