♂, Nan, Thailand.

ON : Hesperia xanthopogon Kollar,[1844] OD : in Hugel, Kaschmir. 4(2):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. 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. (in part)
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, Uémura & Uehara,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 montane forests at moderate elevations (Alt. 500 - 1300m).
This species can be distinguished from allied species, particularly benjamini and furcatus, by examination of the male genitalia.

Kollar, V.,[1844] : Aufzahlung und Beschreibung der von Frciherrn Carl v. Hugel auf seiner Reise durch Kaschmir und das Himaleyagebirge gesammelten Insecten.
in Hugel, Kaschmir und das Reich der Siek.
Stuttgart, Hallbergerische Verlagshandlung 4(2):393-564, 582-585, pl.1-28.

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

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.