♂, Chiang Mai, Thailand.		♀, Chiang Mai, Thailand.
♂, Tak, Thailand.		♀, Lampang, Thailand.
♂, Yala, Thailand.		♀, Yala, Thailand.
♂, Nan, Thailand.		♂, Phetchaburi, Thailand.
♂, Chanthaburi, Thailand.		♂, Trat, Thailand.
♂, Ranong, Thailand.		♂, Ranong, Thailand.

ON : Lycaena ethion Westwood, [1851] OD : in Doubleday, Gen. diurn. Lep. (2):490, pl.76, fig.3,♂. TL : Moulmein ; Silhet. (NHML) Distribution : Sri Lanka, India to Myanmar, Thailand, Laos, Cambodia, Vietnam, Hainan, Langkawi, W.Malaysia, Singapore.

Castalius ethion vavasanus Fruhstorfer, 1922 : in Seitz, Grossschmett. Erde 9:887. TL. S.India.
Castalius ethion colmus Fruhstorfer, 1922 : in Seitz, Grossschmett. Erde 9:887. TL. Ceylon.
Castalius ethion thalimar Fruhstorfer, 1922 : in Seitz, Grossschmett. Erde 9:887. TL. Malay Pen.

[ THAILAND ]
Castalius ethion ; Godfrey,1916 : 137. (Chonburi: Sriracha)
Castalius ethion ethion ; Fruhstorfer,1915-1924 : 887. (Siam)
Castalius ethion ethion ; Godfrey,1930 : 315. (Prae: Me Song forest; Chiang Rai; Chonburi: Sriracha)
Ethion ethion ethion ; Shirôzu & Saigusa,1962 : 64-66, pl.9, figs.69,♂,70,♂(Un),Textfig.29,♂genitalia. (Doi Inthanon)
Ethion ethion ethion ; Kawazoé,1964 : 147. (N: Ping Kong)
Discolampa ethion ethion ; Pinratana,1981 : 37, 160, pl.6, figs.1,♂,2,♂(Un). (Chaiyaphum; Chanthaburi; Kanchanaburi; Uthai Thani; Loei; Mae Hong Son; Nakhon Ratchasima; Trang)
Discolampa ethion thalimar ; Pinratana,1981 : 36, 161, pl.6, fig.3,♂(Un). (Narathiwat; Ranong; Satun)
Discolampa ethion ethion ; Yamaguchi & Aoki,2000 : 257, fig.172,♂. (Mukdahan: Phu Mu; Ubon Ratchathani: Pha Taem; Ban Non Hai)
Discolampa ethion ethion ; Yamaguchi & Aoki,2002 : 32. (Ubon Ratchathani: Phu Chong Na Yoi)
Discolampa ethion ethion ; Yamaguchi, Aoki & Akiyama,2005 : 53. (Mukdahan: Ban Lao Kram; Ban Na Lak; Ubon Ratchathani: Nam Tok Soi Sawan; Phu Chong Na Yoi)
Discolampa ethion ethion ; Katsuyama et al.,2005 : 65-66, fig.68,♂. (Umphang: Tha Sai)
Discolampa ethion ethion ; Ek-Amnuay,[2007] : 556, pl.252, figs.L66a♂,♂(Un). (Wiang Pa Pao)
Discolampa ethion thalimar ; Ek-Amnuay,[2007] : 556, pl.252, figs.L66b♂,♂(Un). (Krabi; Ranong; 'Chanthaburi' [loc.err.])
Discolampa ethion thalimar ; Les Day,2011-2022 : Samui Butterflies, fig.[♂](Un). (Koh Samui) (accessed: 2020.10.05)
Discolampa ethion ethion ; Ek-Amnuay,2012 : 572, pl.259, figs.L91a♂,♂(Un). (Wiang Pa Pao; Chanthaburi)
Discolampa ethion thalimar ; Ek-Amnuay,2012 : 572, pl.259, figs.L91b♂,♂(Un). (Krabi; Ranong)
Discolampa ethion ethion ; Okamoto et al.,2013 : 6. (Kanchanaburi: Mae Klong Station)
Discolampa ethion ethion ; Kimura et al.,2014 : 166, figs.♂,♂(Un),♂,♂(Un),♀,♀(Un). (Doi Chiang Dao; Phu Khiewo; Kao Yai; Nakohn Nayok; Wan Nam Khiewo; Kao Soi Dao; Kratching WF; Kao Khiewo; Sai York Noi; Kuwai Noi; Kaeng Kratchan)
Discolampa ethion thalimar ; Kimura et al.,2014 : 166, figs.♂,♂(Un),♀,♀(Un). (Ranong; Kam Puan; Khlong Naka; Satun; Than To WF.)
Discolampa ethion ethion ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs., Early Stages. (Sa Kaeo; Ratchaburi; Chanthaburi) (accessed: 2022.12.08)
Discolampa ethion thalimar ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2020- : Butterflies of Thailand, fig. (Yala) (accessed: 2022.12.08)
Discolampa ethion ethion ; Chaianunporn & Chaianunporn,2019 : 85. (Chaiyaphum: Chulabhorn Dam)
Discolampa ethion thalimar ; Küppers & Janikorn,2020 : 146, figs.Abb.L-083,♂(Un),084,♂(Un),085,♂,086,♂. (Phang Nga)

[ LAOS ]
Discolampa ethion ethion ; Motono & Negishi,1989 : 69, pl.99, figs.A5,♂,A6,♂(Un). (Tha Ngone; Vang Vieng; Pakse; Luang Prabang)
Discolampa ethion ethion ; Osada, Uémura & Uehara,1999 : 214, pl.108, figs.♂,♂(Un). (Nong Het; Thakhek)
Discolampa ethion ethion ; Onodera,2009b : 35,39,42. (Vientiane: Namsong Riverside; Bolikhamxai: Thabok; Phon Si)
Discolampa ethion ethion ; Nakamura & Wakahara,2012 : 51.
Discolampa ethion ethion ; Onodera,2022 : 72, pl.205, figs.♂,♂(Un),♀,♀(Un). (Khammouan: Natung; Oudomxai)

[ CAMBODIA ]
Discolampa ethion ; Onodera,2007 : 23,25,26, figs.76,♂,77,♀. (Rattanakiri: Veun Sai; Ou Chum)
Discolampa ethion ; Onodera,2009 : 36,40. (Mondolkiri: Bousra; Siem Reap: Phnum Kulen)
Discolampa ethion ethion ; Monastyrskii et al.,2011 : 130. (Phnom Samkos W.S.)
Discolampa ethion ethion ; Chartier & Kosterin,2022 : 120. (Koh Kong; Mondulkiri; Pursat; Ratanakiri; Siem Reap)

[ VIETNAM ]
Castalius ethion ethion ; Fruhstorfer,1915-1924 : 887. (Tonkin)
Castalius ethion ethion ; Metaye,1957 : 91. (no loc.)
Discolampa ethion ; Vu,2003 : 58. (Phu Quoc)
Discolampa ethion ethion ; Miyazaki, Saito & Saito,[2007] : 52, figs.L-14,♂,♀. (Lam Dong: Dambri; Dai Duc Me; Madagui; Dong Nai: Thac Mai; Bin Thuan: Dong Tien)
Discolampa ethion ethion ; Nihira,2009 : 101. (Phu Quoc)
Discolampa ethion ethion ; Monastyrskii & Devyatkin,2015 : 49. (N / C / S)

[ THAILAND ]
Mae Hong Son : 1♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Chiang Mai : 11♂ 1♀ (incl. photo).

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Lampang : 1♀.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Phrae : 1♂ 1♀.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Nan : 2♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Phetchabun : 1♂ (photo).

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

Chonburi : 1♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Chanthaburi : 3♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Trat : 1♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Phetchaburi : 3♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Ranong : 8♂.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Surat Thani (Koh Phangan dist.) : 1♂ (photo by A.Giudici).

Jan

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Mar

Apr

May

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Jul

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Sep

Oct

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Dec

Yala : 4♂ 1♀ (incl. photo by S.Atdhabhan).

Jan

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Nov

Dec

The species is highly variable even in the same locality, and individual variation seems to be more pronounced than geographic variation. I consider that ssp.thalimar from the Malay Peninsula is hardly separable from ssp.ethion. Therefore, I treat it as a synonym of nominotypical subspecies. Individuals in the dry season tend to have a wider white band on the upperside.
The butterfly is not rare in montane forests at low to moderate elevations (Alt. 100 - 700m) and is often found along forest paths or forest edges. Males frequently come to the banks of streams and puddles to suck water.

Westwood, J.O.,1850-1852 : In Doubleday et al., The genera of diurnal Lepidoptera.
vol.2 : ii + pp.251-534, pls.31-80,54. London, Longman, Brown, Green, and Longmans.

Fruhstorfer, H.,1922 : Gattung: Lycaenopsis FLDR. (Cyaniris DALM.) [cont.] -13. Gattung: Castalius HBN. in Seitz, Gross-Schmett. Erde 9
873-880 (15.Apr.1922), 881-888 (18.Apr.1922)

♂, Chiang Mai, Thailand.	♂ with Una usta, Chiang Mai, Thailand.
♂, Chiang Mai, Thailand.	♂, Yala, Thailand. (photo by S.Atdhabhan)
♂ with Odontoptilum pygela, Yala, Thailand.	♂, Surat Thani, Thailand. (photo by A.Giudici)

1999.06.24 - 2023.09.30.