♂, Chiang Mai, Thailand.		♀, Chiang Mai, Thailand.
♂, Mae Hong Son, Thailand.		♀, Phetchabun, Thailand.
♂, Lam Dong, Vietnam. (photo by K.Saito)		♀, Vinh Phuc, Vietnam. (photo by K.Saito)
♂, Phetchaburi, Thailand.		♂, Yala, Thailand.

ON : Nacaduba ? dana Nicéville, 1884 OD : J. asiat. Soc. Bengal, Part II. 52(2/4):73-74, pl.1, fig.15,♂. TL : 'Bholahat, Malda; Buxa, Bhutan; Tarai, Sikkim; Demangiri, Chittagong'. Distribution : Sri Lanka, S.India, Nepal, Bhutan, Sikkim to Myanmar, Andamans, Thailand, Laos, Vietnam, Yunnan, W.Malaysia, Singapore, Borneo, Sumatra, Java, Palawan, Moluccas.

Nacaduba ardates var. dima Rhe Philipe, 1911 : J. Bombay nat. Hist. Soc. 20(3):764. TL. "Naga Hills" [Nagaland, N.E.India]. (NHML)
Petrelaea dana varia Toxopeus, 1929 : Tijdschr. Ent. 72(3/4):242. TL. Java.

[ THAILAND ]
Petrelaea dana dana ; Shirôzu & Saigusa,1962 : 71-72, pl.12, figs.91,♂,92,♂(Un), Textfig.34,♂genitalia. (Srakeo)
Petrelaea dana dana ; Pinratana,1981 : 67, pl.11, figs.3,♂,4,♂(Un). (Chiang Mai; Mae Hong Son; Kanchanaburi; Yala)
Petrelaea dana dana ; Yamaguchi & Aoki,2000 : 257, fig.186,♂(Un). (Mukdahan: Phu Pha Phung)
Petrelaea dana dana ; Ek-Amnuay,[2007] : 586, pl.265, figs.L149,♂,♂(Un). (Wiang Pa Pao)
Petrelaea dana ; Ek-Amnuay,2012 : 610, pl.276, figs.L174,♂,♂(Un). (Wiang Pa Pao)
Petrelaea dana dana ; Okamoto et al.,2013 : 6. (Kanchanaburi: Mae Klong Station)
Petrelaea dana ; Kimura et al.,2014 : 156, figs.♂,♂(Un). (Doi Pha Hom Pok; Chiang Dao; Than To WF.)
Petrelaea dana ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs. (Chiang Mai; Sa Kaeo; Saraburi; Nakhon Nayok; Chachoengsao; Phetchaburi) (accessed: 2023.09.19)
Petrelaea dana ; Küppers & Janikorn,2020 : 168-169, fig.Abb.L-228. (Phang Nga)

[ LAOS ]
Petrelaea dana dana ; Motono & Negishi,1989 : 73, pl.104, figs.A3,♂,A4,♂(Un). (Pakse; Vang Vieng; Phatong)
Petrelaea dana dana ; Osada, Uémura & Uehara,1999 : 216, pl.111, figs.♂,♂(Un). (Nhahin)
Petrelaea dana dana ; Nimura & Wakahara,2005 : 46. (Namdhua)
Petrelaea dana ; Nakamura & Wakahara,2012 : 52.
Petrelaea dana ; Onodera,2022 : 82, pl.212, figs.♂,♂(Un). (Bolikhamxai: Thabok)

[ VIETNAM ]
Nacaduba dana ; Metaye,1957 : 90. (no loc.)
Petrelaea dana dana ; Miyazaki, Saito & Saito,2006d : 57, fig.L-65,♂. (Lam Dong: Dambri; Bin Thuan: Dong Tien)
Petrelaea dana dima ; Monastyrskii & Devyatkin,2015 : 54. (C: Quang Binh ; Lam Dong / S)
Petrelaea dana dima ; Saito et al.,2017 : 79. (S: Nui Cam)

[ THAILAND ]
Mae Hong Son : 1♂.

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Chiang Mai : 4♂ 1♀ (incl. photo).

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Phrae : 1♂.

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Nan : 1♂.

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Chaiyaphum : 1♀.

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Chanthaburi : 2♂ (incl. photo by S.Sophonviwatkul).

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Trat : 1♂ (photo by E.Ikari).

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Phetchaburi : 3♂.

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

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Yala : 1♂.

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[ VIETNAM ]
Vinh Phuc : 1♀.

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Lam Dong : 1♂.

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The butterfly is not rare in montane forests at low to moderate elevations (Alt. 30 - 1200m). Both sexes visit flowers. Males frequently come to the banks of streams and puddles to suck water.
The male genitalia of the populations between the continental region and Yala, P. Thailand are quite different. I tentatively treat them as the same taxon, but further taxonomic study is needed.

Nicéville, L. de,1884 : On new and little-known Rhopalocera from the Indian Region.
J. asiat. Soc. Bengal, Part II. 52(2/4):65-91. pls.1,9,10.

Rhe Phillipe, G.W.V.,1911 : Notes on some Butterflies from the Indian Region.
J. Bombay nat. Hist. Soc. 20(3):753-769.

Toxopeus, L.J.,1929 : Lycaenidae Australasiae VI. De Riodinidae en Lycaenidae van het island Java.
Tijdschr. Ent. 72(3/4):215-244.

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.

Fujioka, T. & Chiba, H.,1988 : Notes on the Distributions of Some Japanese Butterflies
Spec. Bull. Lep. Soc. Jap. (6):141-149. (in Japanese)

Fujioka, T.,2012 : Rare, Local, and Little Known Butterflies from Japan (21) Petrelaea tombugensis Röber,1886 from Bonin Islands
Butterflies (S.fujisanus) 59:6-13. (in Japanese)

♂, Phrae, Thailand.	♂, Surat Thani, Thailand. (photo by A.Giudici)

1999.07.11 - 2023.09.30.