♂ (bred), 2025.01.22. Bangkok, Thailand. (photo by R.Jennarongsak)		♀ (bred), Bangkok, Thailand. (photo by R.Jennarongsak)

ON : Nacaduba biocellata baliensis Tite, 1963 OD : Bull. Br. Mus. nat. Hist. (Ent.) 13(4): 88. TL : W.Bali. (NHML) Distribution : Thailand, W.Malaysia, Singapore, Bali, Lesser Sunda Islands (Sumba; Kisser I.)

Holotype ♂, Rh.16581, May.1935. W.Bali. Gilmanoek (NHML) ; Allotype ♀, as holotype. (NHML)

[ THAILAND ]
Nacaduba biocellata ssp. ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2023- : Butterflies of Thailand, figs., Early Stages. (Samut Sakhon) (accessed: 2024.06.07)
Nacaduba biocellata ssp. ; Inayoshi,2023-2024 : Butterflies in Indo-China, 1♂ (Samut Sakhon) (30.Jun.2024 last updated; 28.Feb.2026 changed.)
Nacaduba biocellata baliensis ; Jennarongsak,2026 : 54-55, figs.12,♂,12v♂(Un),13,♀,13v♀(Un),16-20(early stages).

[ THAILAND ]
Bangkok : 1♂ 2♀.
1♂ (bred), 2025.01.22, R.Jennarongsak bred. (YI)

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Samut Sakhon : 1♂ 1♀ (photo by A.Giudici, R.Jennarongsak).

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The specimens were bred by Rattanapong Jennarongsak in Bangkok. The butterfly is locally not rare in secondary coastal forests in Bangkok and Samut Sakhon.
Originally, this species was found from Bali and the Lesser Sunda Islands to Australia. However, it has been progressively discovered in Singapore, W. Malaysia and Thailand in recent years. While it is clear that the species is introduced, it remains uncertain whether its spread is a result of natural dispersion or human activity. The identity of this population could not be determined previously, as only photos had been taken in the wild, but the specimen above confirms it as ssp.baliensis. The specimen from W. Malaysia shown in G.M. van der Poorten & N.E. van der Poorten (2020) has the same characteristics and is therefore also considered to belong to this taxon. It is expected to be found in many places in the future, especially in coastal areas.

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.

Hirowatari, T.,1990 : Overview on the genus Nacaduba Moore (Lycaenidae)
Yadoriga 142: 2-11. (in Japanese)

van der Poorten, G.M. & van der Poorten, N.E.,2020 : In Corbet & Pendlebury. The Butterflies of the Malay Peninsula, edn. 5.
Malayan Nature Society, Kuala Lumpur.

Jennarongsak, R.,2026 : Notes on two species of Lycaenid butterflies feeding on Pithecellobium dulce (Fabaceae) in Thailand (Lycaenidae, Polyommatinae).
Butterflies 98: 52-56.

♂, Samut Sakhon, Thailand. (photo by A.Giudici)	♀, Samut Sakhon, Thailand. (photo by R.Jennarongsak)

2026.02.28.