♂, 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 ; Sophonviwatkul et al.,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 et al.,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)
Bibasis sena uniformis ; Saito et al.,2021 : 467. (Phu Quoc)

[ 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 uncommon in forests at low to moderate elevations (Alt. 50 - 800m) and is crepuscular. Males are frequently observed mud-puddling along stream banks and at puddles.
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 - 2026.03.31.