♂, Chiang Mai, Thailand.		♀, Chiang Mai, Thailand.
♂, Chiang Mai, Thailand.		♂, Phetchaburi, Thailand.

ON : Pamphila masoni Moore, 1879 OD : Proc. zool. Soc. Lond. 1878(4):842-843, pl.52, fig.5,♂. TL : "Hatsiega", [Kayah State, Myanmar]. (NHML) Distribution : Manipur, Myanmar, Thailand, Laos, Cambodia, Vietnam.

[ THAILAND ]
Halpe masoni ; Godfrey,1930 : 379. (Prae: Me Song forest; W: Klong Pong Kapo)
Thoressa masoni ; Evans,1949 : 252. (Siam)
Thoressa masoni ; Pinratana,1985 : 52, pl.18, figs.94,♂,♂(Un). (Chiang Mai; Chaiyaphum; Nakhon Nayok; Kanchanaburi; Chanthaburi)
Thoressa masoni ; Ek-Amnuay,[2007] : 774, pl.356, figs.H114,♂,♂(Un),♂,♂(Un). (Phrae; Trat)
Thoressa masoni ; Kimura et al.,2011 : 54, figs.♂,♂(Un). (Chiang Dao; Thung Saleng Luang; Phu Khiewo; Kratching WF; Pliewn WF)
Thoressa masoni ; Ek-Amnuay,2012 : 826, pl.381, figs.H111,♂,♂(Un),♂,♂(Un). (Phrae; Trat)
Thoressa masoni ; Okamoto et al.,2013 : 6. (Kanchanaburi: Mae Klong Station)
Thoressa masoni ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs. (Chiang Mai; Phetchabun; Trat; Ratchaburi; Phetchaburi) (accessed: 2023.07.13)

[ LAOS ]
Thoressa masoni ; Motono & Negishi,1989 : 81, pl.113, figs.A7,♂,A8,♂(Un). (Pakse; Vang Vieng; Vientiane: Dan Sum)
Thoressa masoni ; Osada, Uémura & Uehara,1999 : 223, pl.137, fig.♂. (Thabok)
Xanthoneura corissa ssp ; Osada, Uémura & Uehara,1999 : 224, pl.140, fig.♀. (Oudomxay)
Thoressa masoni ; Nakamura & Wakahara,2012 : 58.
Xanthoneura corissa indrasana ; Nakamura & Wakahara,2012 : 59.
Thoressa masoni ; Onodera,2022 : 111, pl.248, figs.♂,♂(Un),♂,♂(Un). (Oudomxai; Phongsali: Muang Mai)

[ CAMBODIA ]
Thoressa masoni ; Kosterin,2019 : 102, figs.83,♂(Un),84,♂. (Koh Kong)
Thoressa masoni ; Kosterin,2019b : 34. (Ratanakiri)
Thoressa masoni ; Chartier & Kosterin,2022 : 125. (Koh Kong; Ratanakiri)

[ VIETNAM ]
Thoressa masoni ; Evans,1949 : 252. (Tonkin)
Thoressa masoni ; Inoué & Kawazoé,1966 ; 93-94, textfig.25(♂genitalia), figs.85,♂,86,♂(Un). (Trang Bom; Dinh Quan; Kontum)
Thoressa masoni ; Devyatkin & Monastyrskii,1999 : 165. (Na Hang; Ba Be)
Thoressa masoni ; Miyazaki, Saito & Saito,2007b : 10, fig.H-58,♂. (Lam Dong: Dambri; Madagui; Bin Thuan: Dong Tien)
Thoressa masoni ; Monastyrskii & Devyatkin,2015 : 77. (N / C / S)

[ THAILAND ]
Mae Hong Son : 8♂.

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Chiang Mai : 13♂ 1♀ (incl. photo).

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Phrae : 1♂.

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Kanchanaburi : 1♂.

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Phetchaburi : 1♂.

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[ LAOS ]
Oudomxai : 1♂ (photo by H.Onodera).

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Bolikhamxai : 2♂ (photo by H.Onodera).

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The butterfly is common in montane forests at low to moderate elevations (Alt. 50 - 1000m). Males are territorial on undergrowth. Males occasionally come to the banks of streams and puddles to suck water.

Moore, F.,1879 : A list of the lepidopterous insects collected by Mr.Ossian Limborg in upper Tenasserim, with descriptions of new species.
Proc. zool. Soc. Lond. 1878(4):821-858, pls. 51-53.

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.

Huang, H.,2011 : Notes on the genus Thoressa Swinhoe, [1913] from China, with the description of a new species (Lepidoptera, Hesperiidae)
Atalanta 42(1-4):193-200.

Huang, Z.F., Chiba, H., Jin, J., Kizhakke, A.G., Wang, M., Kunte, K. & Fan, X.L.,2019 :
A multilocus phylogenetic framework of the tribe Aeromachini (Lepidoptera: Hesperiidae: Hesperiinae), with implications for taxonomy and biogeography
Syst. Entomol. 44:163–178.

Uehara, J. & Masui, A.,2024 : Records of butterflies recently collected from Lao P.D.R., with descriptions of one species and two new subspecies.
Butterflies 95:4-19.

♂, Chiang Mai, Thailand.	♂ (wsf), Chiang Mai, Thailand.
♂ (dsf), Chiang Mai, Thailand.	♂, Chiang Mai, Thailand.
♂ (wsf), Chiang Mai, Thailand.

1999.09.04 - 2025.02.28.