♂, Chiang Mai, Thailand. (RIEB)		♀, Nan, Thailand. (RIEB)
♂, Nan, Thailand. (RIEB)		♀, Nan, Thailand. (RIEB)
♂, Nan, Thailand. (RIEB)		♂, Mae Hong Son, Thailand. (EMBT)
♂, Tak, Thailand. (photo by K.Saito)		♂, Houaphan, Laos. (photo by K.Saito)
♂, Bolikhamxai, Laos. (photo by K.Saito)		♂, Lam Dong, Vietnam. (photo by K.Saito)

ON : Papilio payeni langsonensis Fruhstorfer, 1901 OD : Soc. ent. 16(12):89. TL : Chiem Hoa, Tonkin. (NHML) Distribution : Thailand, Laos, Vietnam, S.Yunnan. ● ssp.langsonensis ● ssp.ciminius

♂, Type (red), #149635, Than-Moi, Tonkin. Juni.-Juli. H.Fruhstorfer (NHML, examined)

[ THAILAND ]
Papilio payeni subsp. ; Godfrey,1916 : 111-112. (Prae: Me Song forest)
Papilio payeni langsonensis ; Godfrey,1930 : 216. (Prae: Me Song forest)
Meandrusa payeni langsonensis ; Pinratana,1977 : 63, figs.P56,♂,♂(Un). (Loei: Phu Kieu)
Meandrusa payeni langsonensis ; Pinratana & Eliot,1992 : 29,44, pl.51, figs.41a♂,♀. (Chiang Mai; Chaiyaphum)
Meandrusa payeni langsonensis ; Ek-Amnuay,[2007] : 104, pl.24, figs.P49a♂,♂(Un),♀. (Doi Pha Hom Pok; Wang Chin)
Meandrusa payeni langsonensis ; Kimura et al.,2011 : 130, figs.♂,♂(Un),♀,♀(Un). (Khun Lao Village; Ban Salok)
Meandrusa payeni langsonensis ; Ek-Amnuay,2012 : 104, pl.24, figs.P46a♂,♂(Un),♀. (Doi Pha Hom Pok; Wang Chin)
Meandrusa payeni langsonensis ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs. (Chiang Mai; Phitsanulok; Phetchabun; Chaiyaphum) (accessed: 2023.05.16)

[ LAOS ]
Papilio payeni f.evan ; Dubois & Vitalis,1914 : 150. (Thado)
Papilio payeni f.evan ; Dubois & Vitalis,1921 : 15. (Laos)
Meandrusa gyas gyas ; Motono & Negishi,1989 : 48, col. pl.11,♂. (Vang Vieng)
Meandrusa payeni langsonensis ; Motono & Negishi,1989 : 48, pl.14, figs.3,♂,4,♂(Un). (Phatong; Nam Ngum Dam)
Meandrusa payeni langsonensis ; Osada, Uémura & Uehara,1999 : 200, pl.21, figs.♂(dsf),♂(Un),♀(dsf). (Phong Saly; Vang Vieng)
Meandrusa payeni langsonensis ; Cotton & Racheli,[2007] : 335. (Thabok; Hinboun: Phou Pha Man; Lak Sao)
Meandrusa payeni langsonensis ; Nakamura & Wakahara,2012 : 41.
Meandrusa payeni langsonensis ; Onodera,2022 : 8, pl.42, figs.♀,♀(Un). (Luang Phabang: Kachat)

[ VIETNAM ]
Papilio payeni langsonensis ; Fruhstorfer,[1903] : 190-192. (Tonkin: Than-Moi)
Papilio payeni langsonensis ; Jordan,1908-1909 : 92. (Tonkin)
Papilio payeni f.evan ; Dubois & Vitalis,1914 : 150. (Annam: Cuichanh / Tonkin: Chapa)
Papilio payeni f.evan ; Dubois & Vitalis,1921 : 15. (Tonkin / Annam)
Papilio evan ; Lemée,1950 : 4. (Hagiang)
Papilio payeni langsonensis ; Metaye,1957 : 83. (N)
Meandrusa payeni langsonensis ; Ikeda et al.,1998 : 17, figs.5:13,♂,14,♂(Un),10:22(♂genitalia). (Cuc Phuong)
Meandrusa payeni langsonensis ; Shinkai,1999 : 59. (N: Lang Song; Tam Dao / S: Bao Lac)
Meandrusa payeni langsonensis ; Luong et al.,2004 : 1, 27, figs.♂,♂(Un). (Cuc Phuong)
Meandrusa payeni ciminius ; Miyazaki, Saito & Saito,2006 : 10, fig.Pa-21,♂. (Lam Dong: Dambri; Dai Duc Me)
Meandrusa payeni ; Monastyrskii et al.,2006 : 38. (Thua Thien Hue: A Luoi; Huong Thuy; Phong Dien)
Meandrusa payeni langsonensis ; Monastyrskii,2007 : 72-73, pl.23, figs.1a♂,1b♂(Un). (N: Hoang Lien; Van Ban; Tuyen Quang; Tam Dao; Ba Be; Cuc Phuong; Ba Vi / C: Pu Mat; Phong Dien; Vu Quang; Ngoc Linh; Kon Cha Rang; Bao Loc)
Meandrusa payeni ciminius ; Miyazaki, Saito & Saito,2007c : 36, fig.pa-21,♀. (Mt.Braian)
Meandrusa payeni langsonensis ; Monastyrskii & Devyatkin,2015 : 13. (N / C to Lam Dong)
Meandrusa payeni langsonensis ; Yokochi et al.,2015 : 39, 44, figs.12,♀,12v♀(Un). (Khanh Hoa: Hon Ba)

[ THAILAND ]
Mae Hong Son : 2♂ (EMBT).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Chiang Rai : 4♂ (RIEB).

Jan

Feb

Mar

Apr

May

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Jul

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Sep

Oct

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Dec

Chiang Mai : 2♂ 1♀ (RIEB; incl. photo).

Jan

Feb

Mar

Apr

May

Jun

Jul

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Sep

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Nov

Dec

Lampang : 1♂ (photo by K.Saito).

Jan

Feb

Mar

Apr

May

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Jul

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Sep

Oct

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Dec

Phrae : 1♂ (photo by K.Saito).

Jan

Feb

Mar

Apr

May

Jun

Jul

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Sep

Oct

Nov

Dec

Nan : 8♂ 3♀ (RIEB).

Jan

Feb

Mar

Apr

May

Jun

Jul

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Sep

Oct

Nov

Dec

Loei : 2♂ (sighting by Y.Inayoshi).

Jan

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Mar

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May

Jun

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Sep

Oct

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Dec

Tak : 4♂ (photo by K.Saito & sighting by Y.Inayoshi).

Jan

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Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Phetchabun : 5♂ (photo by S.Sophonviwatkul).

Jan

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Mar

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May

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Dec

[ LAOS ]
Houaphan : 4♂ 2♀ (photo by K.Saito).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Bolikhamxai : 6♂ 1♀ (photo by K.Saito).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Champasak : 1♀ (RIEB).

Jan

Feb

Mar

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May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

[ VIETNAM ]
Tam Duong : 1♂ (NHML).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Ha Giang : 1♂ (photo by K.Saito).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Lao Cai : 1♂ (photo by K.Saito).

Jan

Feb

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Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

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Tam Duong : 1♂ (NHML).

Jan

Feb

Mar

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May

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Oct

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Lam Dong : 1♂ (RIEB).

Jan

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Dec

The butterfly is locally not rare in montane forests at low to moderate elevations (Alt. 200 - 1300m) and is frequently found on top of mountains. Males form flight paths along mountain ridges, flying very fast and high, and never stoping. Occasionally it comes to streams to suck water, especially where rotting leaves are present.
Further taxonomic study is needed for continental populations.

Fruhstorfer, H.,1901 : Zwei neue Papilio aud Indochina.
Soc. ent. 16(12):89-90.

♂, Phetchabun, Thailand. (photo by S.Sophonviwatkul)	♂, Phetchabun, Thailand. (photo by S.Sophonviwatkul)
♂, Bolikhamxai, Laos. (photo by K.Phongpiyamit)

1996.10.08 - 2023.05.31.