♂, Yala, Thailand.		♀, Yala, Thailand.
♂, Ranong, Thailand.		♀, Yala, Thailand.

ON : Nacaduba ni Nicéville, 1902 OD : J. Bombay nat. Hist. Soc. 14(2):247-248, pl.FF, fig.8,♂. TL : 'N.-E.Sumatra; Sukabuni, W.Java' [NE.Sumatra]. (NZC) Distribution : Thailand, Laos, Vietnam, W.Malaysia, Sumatra.

Nacaduba basiatrata Strand, 1910 : Deut. ent. Zeit. [Iris] 24:203-204. TL. Sumatra.

ni ; Type ♂, N.E.Sumatra. (NZC) ; Sheela et al.,2019 : 151, figs.♂,♂(Un).

[ THAILAND ]
Prosotas gracilis ni ; Pinratana,1981 : 64, pl.10, fig.21,♂(Un). ('Chiang Ma'; Chanthaburi; Kanchanaburi; Nakhon Ratchasima)
'Prosotas gracilis ni ; Ek-Amnuay,[2007] : 584, pl.264, fig.L142,♂(Malaysia),♂(Un,Malaysia)'
Prosotas gracilis ni ; Ek-Amnuay,2012 : 608, pl.275, figs.L167,♂,♂(Un). (Trat)
Prosotas gracilis ni ; Kimura et al.,2014 : 164, figs.♂,♂(Un),♂,♂(Un). (Nakohn Nayok; Kao Soi Dao; Khlong Khavia; Kaeng Krachan; Than To WF.)
Prosotas gracilis ni ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs. (Sa Kaeo; Saraburi; Ratchaburi; Phetchaburi) (accessed: 2023.05.07)

[ LAOS ]
Prosotas gracilis ni ; Osada, Uémura & Uehara,1999 : 215, pl.111, fig.♂. (Lak Sao)
Prosotas gracilis ni ; Nakamura & Wakahara,2012 : 52.

[ VIETNAM ]
Prosotas gracilis ni ; Miyazaki, Saito & Saito,2006d : 57, fig.L-57,♂. (Lam Dong: Madagui)
Prosotas gracilis ni ; Monastyrskii & Devyatkin,2015 : 54. (C: Ha Tinh to Lam Dong)

[ THAILAND ]
Ranong : 1♂.

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Surat Thani : 1♂.

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Yala : 8♂ 2♀ (incl. photo and photo by S.Atdhabhan).

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The butterfly is locally not rare in montane forests at low to moderate elevations (Alt. 50 - 1200m). Males frequently come to the banks of streams and puddles to suck water.
Pinratana (1981) recorded it from Chiang Mai, but there have been no additional records at all since then. The distribution record in northern Thailand needs to be reconfirmed.

Nicéville, L. de,1902 : On new and little-known Butterflies, mostly from the Oriental region.
J. Bombay nat. Hist. Soc. 14(2):236-251, pl.FF.

Strand, E.,1910 : Schmetterlinge aus Zentral und West Sumatra, gesammelt von Herrn Dr. Max Moszkowski.
Deut. ent. Zeit. [Iris] 24:190-208.

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.

♂, Yala, Thailand.	♂, Yala, Thailand.

1999.07.11 - 2023.06.30.