Thoressa masoni  (Moore,[1879])
Thoressa masoni ♂ Up. Thoressa masoni ♂ Un. Thoressa masoni ♀ Up. Thoressa masoni ♀ Un.
♂, Chiang Mai, Thailand. ♀, Chiang Mai, Thailand.
Thoressa masoni ♂ Up. Thoressa masoni ♂ Un. Thoressa masoni ♂ Up. Thoressa masoni ♂ Un.
♂, 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, Tenasserim. (♂, NHML)
Distribution : Myanmar, Thailand, Laos, Vietnam.
Records taken from Literature

[ THAILAND ]
Halpe masoni ; Godfrey,1930 : 379. (Prae: Me Song forest / West: Klong Pong Kapo)
Thoressa masoni ; Evans,1949 : 252. (Siam)
Thoressa masoni ; Pinratana,1985 : 52, pl.18, fig.94. (Chiang Mai / Chaiyaphum / Nakhon Nayok / Kanchanaburi / Chanthaburi)
Thoressa masoni ; Ek-Amnuay,[2007] : 774, pl.356, fig.H114,♂,♂(Un),♂,♂(Un). (Phrae / Trat)
Thoressa masoni ; Kimura et al.,2011 : 54, fig.♂,♂(Un). (Chiang Dao / Thung Saleng Luang / Phu Khiewo / Kratching WF / Pliewn WF)
Thoressa masoni ; Ek-Amnuay,2012 : 826, pl.381, fig.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. (Ratchaburi / Phetchaburi / Chiang Mai / Trat / Phetchabun)

[ LAOS ]
Thoressa masoni ; Motono & Negishi,1989 : 81, pl.113, figs.A7,8. (Pakse / Vang Vieng / Dan Sum, Vientiane)
Thoressa masoni ; Osada, Uémura & Uehara,1999 ; 223, pl.137, fig.♂. (Thabok)
Thoressa masoni ; Nakamura & Wakahara,2012 : 58.

[ VIETNAM ]
Thoressa masoni ; Evans,1949 : 252. (Tonkin)
Thoressa masoni ; Inoué & Kawazoé,1966 ; 93-94, 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)

Specimens Examined

[ THAILAND ]
Mae Hong Son : 8♂.
JanFebMarAprMayJun JulAugSepOctNovDec

Chiang Mai : 13♂ 1♀ (incl.photo).
JanFebMarAprMayJun JulAugSepOctNovDec

Phrae : 1♂.
JanFebMarAprMayJun JulAugSepOctNovDec

Kanchanaburi : 1♂.
JanFebMarAprMayJun JulAugSepOctNovDec

Phetchaburi : 1♂.
JanFebMarAprMayJun JulAugSepOctNovDec


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

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

Notes
Literature

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):821-859, 3 pls.

Thoressa masoni ♂ Thoressa masoni ♂
♂, Chiang Mai, Thailand. ♂ (wsf), Chiang Mai, Thailand.
Thoressa masoni ♂ Thoressa masoni ♂
♂ (dsf), Chiang Mai, Thailand. ♂, Chiang Mai, Thailand.
Thoressa masoni ♂
♂ (wsf), Chiang Mai, Thailand.
1999.09.04 - 2018.10.31.
A Check list of Butterflies in Indo-China, Chiefly from THAILAND, LAOS & VIETNAM. Copyright © 1996- Y.Inayoshi.