♂, Mae Hong Son, Thailand.		♀, Chiang Mai, Thailand.
♂, Mae Hong Son, Thailand.		♀, Chiang Mai, Thailand.
♂, Tak, Thailand.		♀, Chiang Mai, Thailand.
♂ genitalia, Chiang Mai, Thailand.

ON : Celaenorrhinus affinis Elwes & Edwards,1897 OD : Trans. zool. Soc. Lond. 14(4): 121-122, pl.18, fig.9,♀, pl.22, fig.4. TL : 'Khasias [Meghalaya, India]; E.Pegu [E.Bago, Myanmar]; Tenasserim, [Tanintharyi Region, Myanmar]' [Kayah State, Myanmar]. (NHML) Distribution : Assam to Myanmar, Thailand, Laos, Vietnam.

[ THAILAND ]
Celaenorrhinus dhanada affinis ; Pinratana,1985 : 28, pl.12, figs.40,♂,♂(Un). (Chiang Mai; Chaiyaphum)
Celaenorrhinus dhanada affinis ; Ek-Amnuay,[2007] : 752, pl.345, figs.H52,♀,♀(Un). (Doi Inthanon; Mae Hong Son; Chaiyaphum)
Celaenorrhinus dhanada affinis ; Kimura et al.,2011 : 35, figs.♂,♂(Un),♀,♀(Un). (Doi Par Hom Pok; Doi Chiang Dao; Doi Suthep; Phu Khiewo; Doi Inthanon; Doi Musso; Kao Soi Dao)
Celaenorrhinus dhanada affinis ; Ek-Amnuay,2012 : 800,802, pl.369, figs.H50a♂,♂(Un),♀,♀(Un). (Doi Inthanon; Mae Hong Son)
Celaenorrhinus affinis ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2023- : Butterflies of Thailand, figs. (Chiang Mai) (in part) (accessed: 2024.06.17)

[ LAOS ]
Celaenorrhinus dhanada affinis; Masui & Uehara,1996 : 5, pl.2, fig.11,♂,♂(Un). (Saravan)
Celaenorrhinus dhanada affinis ; Osada, Uémura & Uehara,1999 : 222, pl.134, figs.♂,♀. (Thateng)
Celaenorrhinus dhanada affinis ; Nakamura & Wakahara,2012 : 57.
Celaenorrhinus dhanada affinis ; Onodera,2022 : 105, pl.240, figs.♂,♂(Un). (Xiengkhouang: Tha)

[ VIETNAM ]
Celaenorrhinus dhanada affinis ; Devyatkin & Monastyrskii,2003 : 122. (S: Bi Doup - Nui Ba)
Celaenorrhinus dhanada affinis ; Miyazaki, Saito & Saito,2007b : 6, figs.H-20,♂,♀. (Lam Dong: Dambri; Dai Duc Me)
Celaenorrhinus dhanada affinis ; Monastyrskii & Devyatkin,2015 : 72. (C: Lam Dong)

[ THAILAND ]
Mae Hong Son : 1♂.

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Chiang Mai : 2♂ 8♀ (incl. photo).

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Nan : 1♀ (photo by A.Giudici).

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Tak : 1♂.

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The butterfly is locally not rare in montane forests at moderate to high elevations (Alt. 900 - 1700m). Both sexes visit flowers. They often fly out from bushes along the trail and rest on the underside of leaves with their wings spread.
The male genitalia is slightly different from Celaenorrhinus dhanada, and this species is sympatric with Celaenorrhinus dhanada in some parts of Chiang Mai province, N. Thailand. Therefore, I treat it as a distinct species.

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.

♂, Chiang Mai, Thailand.	♀, Nan, Thailand. (photo by A.Giudici)
♀, Chiang Mai, Thailand.

1999.07.31 - 2024.06.30.