♂, Chiang Mai, Thailand.		♀, Chiang Mai, Thailand.
♂, Phetchaburi, Thailand.		♂, Tak, Thailand.
♂ genitalia, Nan, Thailand.

ON : Astictopterus butleri Nicéville, 1884 OD : J. asiat. Soc. Bengal, Part II. 52(2/4):98-99, pl.10, fig.3,♂. TL : Sikkim. (♂) Distribution : Sikkim to Myanmar, Thailand, Laos, Vietnam.

Arunena nigerrima Swinhoe, 1919 : Ann. Mag. nat. Hist. (9)3:317. TL. Khasia Hills, Assam. (♂, NHML)

[ THAILAND ]
Koruthaialos butleri ; Pinratana,1985 : 61, not fig. (Tak; 'Ranong')
Koruthaialos butleri ; Kimura,1997 ; 41, pl.3, figs.51,♂,52,♂(Un). (Tak: Doi Musso)
Koruthaialos butleri ; Ek-Amnuay,[2007] : 784, pl.360, figs.H148,♂,♂(Un). (Tak)
Koruthaialos butleri ; Kimura et al.,2011 : 64, figs.♂,♂(Un) (Doi Suthep; Doi Musso)
Koruthaialos butleri ; Ek-Amnuay,2012 : 838, pl.387, figs.H144,♂,♂(Un). (Tak)

[ LAOS ]
Koruthaialos butleri ; Masui & Uehara,1996 : 5, pl.2, fig.23,♂,♂(Un). (Laksao)
Koruthaialos butleri ; Osada, Uémura & Uehara,1999 : 223, pl.139, fig.♂. (Oudomxay)
Koruthaialos butleri ; Nakamura & Wakahara,2012 : 59.
Koruthaialos butleri ; Onodera,2022 : 114, pl.251, figs.♂,♂(Un). (Oudomxai)

[ VIETNAM ]
Koruthaialos butleri ; Devyatkin & Monastyrskii,1999 : 168. (Cao Bang; Tam Dao; Na Hang; Vu Quang)
Koruthaialos butleri ; Monastyrskii et al.,2006 : 45. (Thua Thien Hue: Huong Thuy)
Koruthaialos butleri ; Monastyrskii & Devyatkin,2015 : 78. (N / C)

[ THAILAND ]
Mae Hong Son : 1♂.

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Oct

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Dec

Chiang Rai : 1♂.

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Mar

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Dec

Chiang Mai : 12♂ 2♀ (incl. photo).

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Loei : 1♂ (photo).

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Nan : 8♂.

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Tak : 3♂.

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Phetchaburi : 1♂.

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The butterfly is locally not rare in montane forests at moderate elevations (Alt. 900 - 1300m) and is often found at forest edges. Both sexes visit flowers.
The figured specimens in Sheela et al.,2019 as the type specimens of Astictopterus butleri are not true type specimens. They are considered to be Koruthaialos rubecula, as Evans,1949 pointed out.
Pinratana,1985 recorded it from Ranong, however, it seems rather doubtful. Therefore, it should be put on hold until a record with a reliable specimen is found. Further distributional study is needed.

Nicéville, L.de,[1884] : Third list of Butterflies taken in Sikkim in October,1883, with Notes on Habits.
J. asiat. Soc. Bengal, Part II. 52(2/4):92-100. pl.10, fig.3.

Swinhoe, C.,1919 : New Lycaenids and Hesperids and Two new Species of the Noctuid Family Acontiidae.
Ann. Mag. nat. Hist. (9)3:314-319.

♂, Loei, Thailand.	♂, Chiang Mai, Thailand.
♂, Nan, Thailand.	♂, Chiang Mai, Thailand.

1999.09.04 - 2023.08.31.