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

ON : Astictopterus butleri Wood-Mason & Nicéville, 1884 OD : J. asiat. Soc. Bengal, Part II. 52(2/4):98-99, pl.10, fig.3,♂. TL : 'Mergui Aechipelago, [Myeik Dist., Myanmar]; Cachar, [Assam]' ['Sikkim']. Distribution : Sikkim, Assam, Myanmar, Thailand, Laos, Vietnam.

Arunena nigerrima Swinhoe, 1919 : Ann. Mag. nat. Hist. (9)3:317. TL. "Khasia Hills, Assam" [Khasi Hills, Meghalaya, India]. (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♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Chiang Rai : 1♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Chiang Mai : 12♂ 2♀ (incl. photo).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Loei : 1♂ (photo).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Nan : 8♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Tak : 3♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Phetchaburi : 1♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

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.

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.

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

1999.09.04 - 2025.01.31.