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

ON : Eudamus calathus Hewitson, 1876 OD : Ann. Mag. nat. Hist. (4)18: 353. TL : Sumatra. (NHML) Distribution : S.E. & P.Thailand, S.Cambodia, Langkawi, W.Malaysia, Tioman, Borneo, Sumatra, Bangka, Natuna, Palawan. ● ssp.balta ● ssp.calathus

Hesperia schaedia Hewitson, 1876 : Ann. Mag. nat. Hist. (4)18: 452. TL. Sumatra. (NHML)
Lotongus maculatus Distant, 1886 : Rhop. malayana: 372, pl.35, fig.1,♂. TL. 'Malay Peninsula; Malacca' [Malacca, W.Malaysia]. (NHML)
Proteides surus Mabille, 1895 : Bull. Soc. ent. Fr. 1895: lix. TL. Borneo. (NHML)

[ THAILAND ]
Lotongus schaedia ; Godfrey,1930 : 377. (Chonburi: Hup Bon)
Lotongus calathus ; Godfrey,1930 : 377. (Chonburi: Sriracha; Surat Thani: Khao Poata) (in part)
Lotongus calathus ; Godfrey,1932a : 276. (P)
Lotongus calathus balta ; Pinratana,1985 : 84. (Chanthaburi) (in part)
Lotongus calathus calathus ; Pinratana,1985 : 84, pl.28, figs.180b♂,♂(Un). (Surat Thani; Trang)
Lotongus calathus balta ; Ek-Amnuay,[2007] : 804, pl.369, figs.H210a♂,♂(Un),♀. (Chanthaburi)
Lotongus calathus calathus ; Ek-Amnuay,[2007] : 804, pl.369, figs.H210b♂,♂,♂(Un). (Trang; Ranong)
Lotongus calathus balta ; Kimura et al.,2011 : 82. (Kao Soi Dao; Kratching WF; Pliewn WF; Kao Chamaoh; Kao Khiewo) (in part)
Lotongus calathus calathus ; Kimura et al.,2011 : 82, figs.♂,♂(Un),♀,♀(Un). (Kaper WF; Kam Puan; Muang Shone; Khlong Naka; Kha Chong; Tarutao Is; Than To WF.)
Lotongus calathus balta ; Ek-Amnuay,2012 : 864, pl.398, figs.H208a♂,♂(Un). (Chanthaburi)
Lotongus calathus calathus ; Ek-Amnuay,2012 : 864, pl.398, figs.H208b♂,♂(Un),♂(Un),♀,♀(Un). (Trang; Ranong)
Lotongus calathus calathus ; Küppers & Janikorn,2017 : 110-111, figs.Abb.H-200-202. (Phang Nga)
Lotongus calathus calathus ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2023- : Butterflies of Thailand, figs., Early Stages. (Chanthaburi; Krabi) (accessed: 2023.09.02)

[ CAMBODIA ]
Lotongus calathus balta ; Kosterin,2019 : 102, figs.68-69,♀(Un),70,♂(Un). (Koh Kong)
Lotongus calathus balta ; Chartier & Kosterin,2022 : 126. (Koh Kong)

[ THAILAND ]
Chanthaburi : 5♂ 3♀ (incl. photo).

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Trat (Koh Kut dist.) : 5♂ (photo by E.Ikari)

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Ranong : 6♂ 4♀.

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Yala : 7♂ 3♀ (incl. photo by S.Atdhabhan).

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The butterfly is locally common in montane forests at low elevations (Alt. 30 - 350m). Both sexes visit flowers.
The populations from S.E. Thailand and S.Cambodia appear to be intermediate, but slightly closer to ssp.calathus than ssp.balta. I tentatively treat them as this taxon, but we need to compare them with the nearby populations. Further taxonomic study is needed.

Hewitson, W.C.,1876 : Descriptions of twenty new species of Hesperidae.
Ann. Mag. nat. Hist. (4)18: 347-355.

Hewitson, W.C.,1876 : Descriptions of twenty five new species of Hesperidae from his own collection.
Ann. Mag. nat. Hist. (4)18: 449-457.

Distant, W.L.,1882-1886 : Rhopalocera Malayana : a Description of the Butterflies of the Malay Peninsula.
London, Author, Penang, Logan: xvi + 482 + [4] pp, 46 pls.

Mabille, P.,1895 : Descriptions de quelques Hesperides nouvelles.
Bull. Soc. ent. Fr. 1895: lv-lix.

Evans, W.H.,1949 : A catalogue of the Hesperiidae from Europe, Asia and Australia in the British Museum (Natural History).
i-xix + 1-502, pls.1-35. London.

♂, Chanthaburi, Thailand.	♂, Chanthaburi, Thailand.

1999.09.11 - 2025.01.31.