♂, Lam Dong, Vietnam. (photo by K.Saito)		♀, Lam Dong, Vietnam. (photo by K.Saito)
♀, 2014.03.--. Chanthaburi, Thailand.

ON : Eulaceura osteria sitarama Fruhstorfer, 1913 OD : In: Seitz, Gross-Schmetterl. Erde 9: 702. TL : Insel Hainan. Distribution : S.Yunnan, N. & S.E.Thailand, Laos, Vietnam, Hainan. ● ssp.sitarama ● ssp. ? ● ssp.kumana

[ THAILAND ]
Eulaceura osteria sitarama: Saito & Inayoshi,2022b : 25, figs.13,♂(Un),14,♀,14v♀(Un). (Chanthaburi: Soi Dao Dist ; Pong Nam Ron Dist.)
Eulaceura osteria sitarama: S.Sophonviwatkul et al.,2023- : Butterflies of Thailand, fig. (Chanthaburi) (accessed: 2023.04.27)
Eulaceura osteria sitarama: Masui,2025 : 232, pl.59, figs.♂,♂(Un). ('N.Thailand')

[ LAOS ]
Eulaceura osteria sitarama ?: Masui & Uehara,1999 : 19,22, figs.10,♂,♂(Un),♀,♀(Un). (Thakhek; Khounkham)
Eulaceura osteria ssp.: Osada et al.,1999 : 208, pl.73, figs.♂,♀. (Thakhek; Nhahin)
Eulaceura osteria ssp.: Nimura & Wakahara,2005 : 43. (Namdhua)
Eulaceura osteria sitarama: Nakamura & Wakahara,2012 : 47.
Eulaceura osteria sitarama: Onodera,2022 : 48, pl.143, figs.♀,♀(Un). (Bolikhamxai: Thabok)
Eulaceura osteria sitarama: Masui,2025 : 232, pl.59, figs.♂,♂(Un). (Laos)

[ VIETNAM ]
Eulaceura osteria kumana: Ikeda et al.,2000 : 36, figs.7:8,♂,9,♂(Un),10,♀,11,♀(Un), fig.9:40(♂,genitalia). (Cuc Phuong)
Eulaceura osteria: Luong et al.,2004 : 8, 70, figs.♂,♂(Un). (Cuc Phuong)
Eulaceura osteria: Monastyrskii et al.,2006 : 42. (Thua Thien Hue: Nam Dong; A Luoi; Huong Thuy; Phong Dien; Bach Ma)
Eulaceura osteria sitarama: Miyazaki et al.,2006b : 34, figs.N-107,♂,♀. (Lam Dong: Dambri)
Eulaceura osteria sitarama: Monastyrskii & Devyatkin,2015 : 43. (N / C / S)
Eulaceura osteria sitarama: Monastyrskii,2019 : 4(1):59-60, pl.5, figs.1a♂,1b♂(Un),1c♀. (N: Ba Be; Xuan Lac; Tam Dao; Cuc Phuong / C: Xuan Lien; Pu Mat; Huong Son; Vu Quang; Phong Dien; Dakrong; Nam Dong; A Luoi; Huong Thuy; Bach Ma; Son Thanh; Que Phuoc; Ngoc Linh; Dong Xuan; Chu Yang Sin; Hon Ba; Loc Bac; Da Teh / S: Cat Loc; Nghia Trung; La Nga)
Eulaceura osteria sitarama: Masui,2025 : 232, pl.58, figs.♂,♂(Un),♀,♀(Un),♀,♀(Un). (Vietnam)

[ THAILAND ]
Chanthaburi : 4♂ 1♀ (incl. photo by S.Sophonviwatkul and A.Giudici).
Soi Dao Dist., 2012.04.15. 1♂, S.Sophonviwatkul (photo) ; Pong Nam Ron Dist., 2014.03.--. 1♀, LC (YI)

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Chaiyaphum : 1♂ (sighting by Y.Inayoshi).

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[ LAOS ]
Thabok : 1♀ (photo by H.Onodera).

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[ VIETNAM ]
Lam Dong : 17♂ 1♀.

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New to Thailand. The first discovery was photographed by Supat Sophonviwatkul on 15 April 2012 in Soi Dao district, Chanthaburi.
Only a few examples from S.E. Thailand were known until now. I treat it as this taxon temporarily, however further taxonomic study is needed with more specimens.
I have once seen a male in Chaiyaphum province, C.Thailand, but it was only a sighting. Therefore, I am not sure if that was this taxon or another one. Confirmation by specimens is needed.
The butterfly is locally not uncommon in montane forests at low to moderate elevations (350-1,000 m a.s.l.), and frequently rests on the underside of leaves.

Fruhstorfer, H.,1913 : 6. Familie: Nymphalidae. In: Seitz, A. (Ed.), Die Gross-Schmetterlinge der Erde.
9: 697-704 (5.Aug.1913), Stuttgart, Alfred Kernen.

♂, Chanthaburi, Thailand. (photo by A.Giudici)	♂, 2012.04.15. Chanthaburi, Thailand. (photo by S.Sophonviwatkul)
♂, Chanthaburi, Thailand. (photo by S.Sophonviwatkul)

2007.09.20 - 2025.12.31.