♂, Phetchabun, Thailand.		♀, Phetchabun, Thailand.
♂ (bred), Phetchabun, Thailand. (photo by S.Sophonviwatkul)		♀, Chaiyaphum, Thailand.

ON : Lotongus calathus balta Evans, 1949 OD : Cat. Hesp. Europ. Asia Austr. Brit. Mus : 320. TL : Kanbauk, Tavoy. (♂, NHML) Distribution : Myanmar (Karens to Mergui), Thailand, Laos, Cambodia, Vietnam. ● ssp.balta ● ssp.calathus

[ THAILAND ]
Lotongus calathus ; Godfrey,1930 : 377. (Prae: Me Song forest; Khanbuli) (in part)
Lotongus calathus balta ; Evans,1949 : 320. (Siam)
Lotongus calathus balta ; Pinratana,1985 : 84, pl.28, figs.180a♂,♂(Un). (Nakhon Nayok) (in part)
Lotongus calathus balta ; Kimura et al.,2011 : 82, figs.♂,♂(Un),♀,♀(Un). (Doi Suthep; Nakohn Nayok) (in part)
Lotongus calathus balta ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs., Early Stages. (Phetchabun; Sa Kaeo; Saraburi; Nakhon Nayok) (accessed: 2023.09.02)

[ LAOS ]
Lotongus calathus balta ; Masui & Uehara,1997 : 6, 5, figs.21,♂,♂(Un). (Saravan)
Lotongus calathus balta ; Osada, Uémura & Uehara,1999 : 224, pl.140, fig.♂. (Saravan)
Lotongus calathus balta ; Nakamura & Wakahara,2012 : 59.

[ CAMBODIA ]
Lotongus calathus balta ; Chartier & Kosterin,2022 : 126. (Koh Kong)

[ VIETNAM ]
Lotongus calathus ; Godfrey,1919 : 470. (S: Daban)
Lotongus calathus balta ; Evans,1949 : 320. (Tonkin)
Lotongus calathus balta ; Inoué & Kawazoé,1970 ; 1, figs.129,♂,130,♂(Un),textfig.38(♂,genitalia). (Trang Bom)
Lotongus calathus balta ; Devyatkin & Monastyrskii,1999 : 171. (Ba Na)
Lotongus calathus ; Vu,2003 : 59. (Phu Quoc)
Lotongus calathus ; Monastyrskii et al.,2006 : 45. (Thua Thien Hue: Huong Thuy; Phong Dien; Bach Ma)
Lotongus calathus balta ; Miyazaki, Saito & Saito,2007b : 14, fig.H-87,♂. (Lam Dong: Dambri; Dai Duc Me)
Lotongus calathus balta ; Monastyrskii & Devyatkin,2015 : 81. (N / C / S)

[ THAILAND ]
Phetchabun : 4♂ 1♀ (incl. photo).

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Chaiyaphum : 1♀.

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Nakhon Nayok : 1♂ 1♀ (photo by M.Hayashi).

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The butterfly is locally not rare in montane forests at moderate elevations (Alt. 500 - 900m). Both sexes visit flowers.
The populations from S.E.Thailand appear to be intermediate, but slightly closer to ssp.calathus than ssp.balta. I tentatively treat them as the nominotypical subspecies, but we need to compare them with the nearby populations. Further taxonomic study is needed.

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.

♂, Phetchabun, Thailand.	♀, Phetchabun, Thailand.
♀, Phetchabun, Thailand.	♀, Chaiyaphum, Thailand.

1999.09.11 - 2023.12.31.