♂, Chiang Mai, Thailand.		♀, Chiang Mai, Thailand.
♂, Yala, Thailand.		♀, Surat Thani (Koh Phangan), Thailand.
♂, Chanthaburi, Thailand.		♂, Phetchaburi, Thailand.

ON : Lycaenesthes merguiana Moore, 1884 OD : J. asiat. Soc. Bengal, Pt.2. 53(1):23. TL : Mergui, Myanmar. (♂, NZC) Distribution : Sikkim to Myanmar, Thailand, Laos, Cambodia, Vietnam, Yunnan, Hainan, Langkawi, W.Malaysia, Tioman, Singapore, Borneo, Sumatra, Nias, Simeulue, Enggano, Palawan.

Type ♂, 1882.iii.21. Mergui, Burma. (NZC) ; Sheela et al.,2019 : 119, figs.♂(Un),♂.

[ THAILAND ]
Nacaduba viola merguiana ; Godfrey,1930 : 321-322. (Chiang Rai)
Ionolyce helicon merguiana ; Pinratana,1981 : 63, pl.10, fig.19,♂(Un). (Chiang Mai; Chanthaburi; Nakhon Nayok; Ranong; Trang; Yala)
Nacaduba beroe gythion ; Ek-Amnuay,[2007] : pl.264, figs.136,♂,♂(Un),♂,♂(Un). (Chanthaburi)
Ionolyce helicon merguiana ; Ek-Amnuay,[2007] : 583, pl.264, figs.L139,♂,♂(Un),♀,♀(Un). (Chiang Dao; Chanthaburi)
Ionolyce helicon merguiana ; Les Day,2011-2022 : Samui Butterflies, figs.♂(Un),♀(Un). (Koh Samui) (accessed: 2021.06.14)
Ionolyce helicon merguiana ; Ek-Amnuay,2012 : 606, pl.275, figs.L164,♂,♂(Un),♀,♀(Un). (Chiang Dao; Chanthaburi)
Ionolyce helicon merguiana ; Okamoto et al.,2013 : 6. (Kanchanaburi: Mae Klong Station)
Ionolyce helicon merguiana ; Kimura et al.,2014 : 165, figs.♂,♂(Un),♂,♂(Un),♀,♀(Un). (Nakohn Nayok; Kao Soi Dao; Kratchin WF; Kan Puan; Muang Shone; Ka Chong; Thaleban; Than To WF.)
Ionolyce helicon merguiana ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs. (Kanchanaburi; Sa Kaeo; Phetchaburi; Yala) (accessed: 2023.05.07)
Ionolyce helicon merguiana ; Chaianunporn & Chaianunporn,2019 : 85. (Chaiyaphum: Chulabhorn Dam)
Ionolyce helicon merguiana ; Küppers & Janikorn,2020 : 166, figs.Abb.L-210-213. (Phang Nga)
Prosotas aluta nanda ; Küppers & Janikorn,2020 : 168, figs.Abb.L-227. (Phang Nga)

[ LAOS ]
Ionolyce helicon merguiana ; Motono & Negishi,1989 : 72, not fig. (Vang Vieng; Phatong)
Ionolyce helicon merguiana ; Osada, Uémura & Uehara,1999 : 215, pl.111, figs.♂,♂(Un),♀. (Thabok; Xam Neua)
Ionolyce helicon merguiana ; Onodera,2009b : 43. (Bolikhamxai: Phon Si)
Ionolyce helicon merguiana ; Nakamura & Wakahara,2012 : 52.
Ionolyce helicon merguiana ; Suwa et al.,2013 : 26. (Thabok; Nahin)
Ionolyce helicon ; Suwa et al.,2019 : 30. (Nam Pheng; Thabok)
Ionolyce helicon merguiana ; Onodera,2022 : 81, pl.212, figs.♂,♂(Un),♀,♀(Un). (Bolikhamxai: Konglor; Xiengkhouang: Tha)

[ CAMBODIA ]
Ionolyce helicon merguiana ; Monastyrskii et al.,2011 : 130. (Phnom Samkos W.S.)
Ionolyce helicon merguiana ; Chartier & Kosterin,2022 : 121. (Koh Kong; Pursat)

[ VIETNAM ]
Ionolyce helicon merguiana ; Ikeda et al.,2001 : 51, figs.3:19,♂,20,♂(Un),7:27(♂genitalia). (Cuc Phuong)
Ionolyce helicon merguiana ; Luong et al.,2004 : 10. (Cuc Phuong)
Ionolyce helicon ; Monastyrskii et al.,2006 : 43. (Thua Thien Hue: A Luoi; Huong Thuy; Bach Ma)
Ionolyce helicon merguiana ; Miyazaki, Saito & Saito,[2007] : 57, fig.L-64,♂. (Lam Dong: Dambri)
Ionolyce helicon merguiana ; Monastyrskii & Devyatkin,2015 : 53. (N / C / S)

[ THAILAND ]
Chiang Rai : 1♂ 1♀.

Jan

Feb

Mar

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May

Jun

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Aug

Sep

Oct

Nov

Dec

Chiang Mai : 9♂ (incl. photo).

Jan

Feb

Mar

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May

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Sep

Oct

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Dec

Nan : 1♂.

Jan

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Mar

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Tak : 2♂.

Jan

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Chanthaburi : 2♂.

Jan

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Trat : 1♂.

Jan

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Mar

Apr

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Oct

Nov

Dec

Phetchaburi : 1♂.

Jan

Feb

Mar

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Ranong : 7♂.

Jan

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Surat Thani (Koh Phangan dist.) : 1♂ 1♀.

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Krabi : 1♂.

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Yala : 7♂ 1♀ (incl. photo).

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The butterfly is not rare in montane forests at low to high elevations (Alt. 50 - 1600m). Males are territorial on trees or shrubs at hilltops and, like Nacaduba, prefer to settle at the tips of twigs. Males frequently come to the banks of streams and puddles to suck water.

Moore, F.,1884 : Descriptions of some New Asiatic Lepidoptera; chiefly from Specimens contained inthe Indian Museum, Calcutta.
J. asiat. Soc. Bengal, Pt.2. 53(1):16-52.

Tite, G.E.,1963 : A Synonymic List of the Genus Nacaduba and Allied Genera (Lepidoptera: Lycaenidae).
Bull. Br. Mus. nat. Hist. (Ent.) 13(4):69-116, 91 tf, 2 pls. London.

♂, Chiang Mai, Thailand.	♀, Yala, Thailand.
♂, Chiang Mai, Thailand.

1999.07.11 - 2023.09.30.