♂, Nan, Thailand.

ON : Hesperia xanthopogon Kollar, 1844 OD : In: Hügel, Kaschmir. 4(2)[1]: 453, pl.18, figs.1, 2. TL : "Himaleya". Distribution : Kashmir, Nepal, Sikkim, Assam, Myanmar, Thailand, Laos, Vietnam, China, Taiwan.

Choaspes similis Evans, 1932; Ident. Indian Butts. (2nd ed.): 320–321; TL: 'Sikkim; Assam; W.China' [Assam]. (NHML)
Choaspes xanthopogon crysopterus Hsu, 1988; Bull. Inst. zool. Acad. Sin. 27: 237, figs.3(HT,♂), 4(HT,♂Un), 5(PT,♀), 6(PT,♀Un); TL: Taoyuan, Mt. Lala, Taiwan.

crysopterus ;
Holotype ♂, emerged on 12.Oct.1986, Mt.Lala, Taoyuan, Taiwan. Y.F. Hsu leg. (NTU)
Paratype 1♀, emerged on 12.Aug.1987, same locality as holotype. Y.F. Hsu leg. (NTU)

[ THAILAND ]
Choaspes xanthopogon: Pinratana,1985 : 24, pl.8, figs.28,♂,♂(Un). (Chiang Mai)
Choaspes xanthopogon xanthopogon: Tsukiyama,1992 ; 29, pl.3, fig.4-1a♂. (Chiang Dao)
Choaspes xanthopogon: Ek-Amnuay,[2007] : 740. (partim)
Choaspes xanthopogon xanthopogon: Chiba,2009 : 41–42, pl.19, figs.1,♂,2,♀. (Chiang Dao; Fang)
Choaspes xanthopogon xanthopogon: Kimura et al.,2011 : 29, figs.♂,♂(Un). (Doi Suthep)
Choaspes xanthopogon xanthopogon: Ek-Amnuay,2012 : 788, pl.364, figs.H32,♂,♂(Un),♂(Un). (Chiang Mai)

[ LAOS ]
Choaspes xanthopogon: Masui & Uehara,1996 : 5, pl.2, fig.6,♂,♂(Un). (Phong Sali)
Choaspes xanthopogon: Osada et al.,1999 : 221, pl.132, fig.♂. (Phong Saly)
Choaspes xanthopogon xanthopogon: Chiba,2009 : 41–42, pl.19, figs.1,♂,2,♀. (Phon Saly; 'La Sao' [Lak Sao])
Choaspes xanthopogon xanthopogon: Nakamura & Wakahara,2012 : 57.

[ VIETNAM ]
Choaspes xanthopogon xanthopogon: Chiba,2009 : 41–42, pl.19, figs.1,♂,2,♀. (Khanh Hoa)
Choaspes xanthopogon xanthopogon: Monastyrskii & Devyatkin,2015 : 71. (C: Khanh Hoa)
Choaspes xanthopogon xanthopogon: Yokochi et al.,2015 : 43, figs.118,♂,118v♂(Un),119,♀,119v♀(Un). (Khanh Hoa: Hon Ba)

[ THAILAND ]
Nan : 1♂.

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[ VIETNAM ]
Khanh Hoa : 2♂ 1♀.

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The butterfly is rare and very localized in forests at moderate elevations (500–1300 m a.s.l.).
This species can be distinguished from allied species, particularly benjamini and furcatus, by examination of the male genitalia.

Kollar, V.,1844 : In: Kollar, V. & L. Redtenbacher, Aufzählung und Beschreibung der von Freiherrn Carl v. Hügel auf seiner Reise durch Kaschmir und das Himaleyagebirge gesammelten Insecten.
In: Hügel, Kaschmir und das Reich der Siek.
Stuttgart, Hallbergerische Verlagshandlung 4(2)[1]: [393]-564, [582]-[586], 28 pls.

Evans, W.H.,1932 : The identification of Indian butterflies. second edition revised.
Bombay nat. Hist. Soc., Madras. 10 + 454 pp, 32 pls, 9f.

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.

Hsu, Y.F.,1988 : A Revision of Choaspes xanthopogon (Kollar) with description of a new subspecies, C. X. chrysopterus (Lepidoptera: Hesperiidae).
Bull. Inst. Zool., Academia Sinica 27(4): 235-244.

1999.07.31 - 2023.04.30.