♂, Yala, Thailand.		♀, Yala, Thailand. (photo by S.Atdhabhan)

Specimens from transition zone
♂, Chanthaburi, Thailand.		♂, Chanthaburi, Thailand.
♂, Chanthaburi, Thailand.		♂, Chanthaburi, Thailand.
♂, Chaiyaphum, Thailand.		♂, Thua Thien Hue, Vietnam. (photo by K.Saito)
♂, Dong Nai, Vietnam. (photo by K.Saito)		♀, Khanh Hoa, Vietnam. (photo by K.Saito)

ON : Bibasis uniformis Elwes & Edwards, 1897 OD : Trans. zool. Soc. Lond. 14(4): 305, pl.27, fig.95(♂genitalia). TL : 'Java; Kina Balu, [Borneo]; Palawan; Luzon' [Java]. (NHML) Distribution : Myanmar, P.Thailand, W.Malaysia, Borneo, Java, Kangean, Bali, Lombok, Bawean, Sumba, Sumbawa. ● ssp.sena ● transition zone of sena and uniformis ● ssp.uniformis

♂, Type (red), H2424, Java. (NHML, examined)

[ THAILAND ]
Bibasis sena sena ; Godfrey,1932a : 274. (Takuapa: Kapong)
Bibasis sena uniformis ; Pinratana,1985 : 17, pl.4, figs.10b♂,♂(Un). (Ratchaburi; Trang; Yala)
Bibasis sena uniformis ; Ek-Amnuay,[2007] : 728, pl.333, figs.H12b♂,♂(Un). (Yala; Ratchaburi)
Bibasis sena uniformis ; Les Day,2011-2022 : Samui Butterflies, fig.[♂](Un). (Koh Samui) (accessed: 2023.03.08)
Bibasis sena uniformis ; Kimura et al.,2011 : 23, figs.♂,♂(Un). (Muang Shone; Kao Poh Ta; Than To WF.)
Bibasis sena uniformis ; Ek-Amnuay,2012 : 776, pl.357, figs.H11b♂,♂(Un). (Yala; Ratchaburi)
Bibasis sena uniformis ; Küppers & Janikorn,2017 : 68-69, fig.Abb.H-053. (Phang Nga)
Bibasis sena uniformis ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2024- : Butterflies of Thailand, figs. (Nakhon Si Thammarat; Yala) (accessed: 2024.06.17)

[ VIETNAM ]
Bibasis sena uniformis ; Inoué & Kawazoé,1964 : 35-36, textfig.1(♂genitalia), figs.1,♂,2,♂(Un). (Trang Bom)
Bibasis sena ; Vu,2003 : 58. (Phu Quoc)
Bibasis sena ; Monastyrskii et al.,2006 : 44. (Thua Thien Hue: Nam Dong; A Luoi; Huong Thuy)
Burara sena sena ; Miyazaki, Saito & Saito,2007b : 2, fig.H-3,♂. (Lam Dong: Dambri; Dong Nai: Thac Mai)
Bibasis sena uniformis ; Chiba,2009 : 15, pl.5, fig.8,♂(Un). (S)
Bibasis sena uniformis ; Monastyrskii & Devyatkin,2015 : 70. (C: Thua Thien Hue to Lam Dong / S)

[ THAILAND ]
Yala : 5♂ 1♀ (incl. photo & photo by S.Atdhabhan).

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Transition zone of ssp.sena and ssp.uniformis

[ VIETNAM ]
Thua Thien Hue : 1♂.

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Khanh Hoa : 1♀.

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Dong Nai : 1♂.

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The butterfly is locally not rare in montane forests at low to moderate elevations (Alt. 50 - 800m) and is crepuscular. Males frequently come to the banks of streams and puddles to suck water.
The area from the northern part of peninsular Thailand to central Vietnam seems to be a transition zone between ssp.sena and ssp.uniformis. Both taxa are sympatric, and intermediate individuals are often found together.

Elwes, H.J. & Edwards, J.,1897 : A Revision of the Oriental Hesperiidae.
Trans. zool. Soc. Lond. 14(4): 101-324, pls.18-27.

Evans, W.H.,1949 : A catalogue of the Hesperiidae from Europe, Asia and Australia in the British Museum (Natural History).
i-xix + 1-502, pls.1-35. London.

♂, Yala, Thailand.

1999.07.31 - 2025.02.28.