♂, Nakhon Si Thammarat, Thailand.		♂, Surat Thani (Koh Tao), Thailand. (photo by P.Kosierb)
♂, Surat Thani (Koh Tao), Thailand. (photo by P.Kosierb)		♂, Surat Thani (Koh Tao), Thailand. (photo by P.Kosierb)

ON : Chilades lajus tavoyana Evans, 1925 OD : J. Bombay nat. Hist. Soc. 30(2): 344. TL : "Tavoy" [Kanbauk, Dawei Dist., Tanintharyi Region, Myanmar]. (NHML) Distribution : S.Myanmar, P.Thailand, Langkawi, W.Malaysia (Kedah). ● ssp.lajus ● ssp.tavoyana

Lectotype ♂, BMNH(E)#264384, Kanbauk, Tavoy. 26.11.'20. W.H.Evans. designated by Balint,1999 (NHML)
Paralectotypes 1♂ 2♀. Tavoy, Burma. designated by Balint,1999 (NHML)

[ THAILAND ]
Chilades lajus lajus ; Pinratana,1981 : 53. (Prachuap; Krabi) (in part)
Chilades lajus tavoyanus ; Pinratana,1981 : 53, pl.8, figs.2,♂,3,♀,4,♂(Un). (Phuket; Prachuab Kiri Khan; Satun) (in part)
Chilades lajus tavoyanus ; RDPB & DNP,2006-2008 : Butterflies in Hala-Bala Forest, fig.[♂](Un). (Narathiwat: Hala Bala) (last update: 2007.01.05 ; accessed: 2024.06.03)
Chilades lajus tavoyanus ; Ek-Amnuay,[2007] : 570, pl.258, figs.L105b[L106b],♀,♀(Un). (Prachuab Khiri Khan)
Chilades lajus tavoyanus ; Les Day,2011-2022 : Samui Butterflies, figs.♂,♀,['♀'](Un). (Koh Samui) (accessed: 2021.01.30)
Chilades lajus tavoyanus ; Ek-Amnuay,2012 : 590, pl.267, figs.L131b♀,♀(Un). (Prachuab Khiri Khan)
Chilades lajus tavoyanus ; Kimura et al.,2014 : 196, figs.♂,♂(Un),♀,♀(Un). (Koh Samui; Satun; Sonkhla)
Chilades lajus tavoyanus ; Küppers & Janikorn,2020 : 152-153, figs.Abb.L-143-146. (Phang Nga)

[ THAILAND ]
Surat Thani (Koh Tao ; Koh Phangan) : 5♂ (incl. photo by A.Giudici).

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Nakhon Si Thammarat : 1♂.

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The butterfly is locally not rare in citrus plantations or gardens at low elevations (Alt. 10m - 350m). Both sexes visit flowers and males occasionally come to the banks of streams and puddles to suck water.
The identification and distribution of the nominotypical subspecies and ssp.tavoyanus in Thailand is still unclear. I tentatively follow Kimura et al. (2014), but the populations from SE.Thailand and Phetchaburi, P.Thailand may be ssp.tavoyanus. Further taxonomic study with a large number of specimens from different localities is needed.

Evans, W.H.,1925 : The Identification of Indian Butterflies. Part VI.
J. Bombay nat. Hist. Soc. 30(2): 322-351, 2 pls.

Balint, Z.,1999 : Annotated list of type specimens of Polyommatus sensu Eliot of the Natural History Museum, London (Lepidoptera, Lycaenidae).
Neue ent. Nachr. 46: 1-89.

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

1999.07.04 - 2024.06.30.