♂ (ds), Nan, Thailand.		♀ (ds), Nan, Thailand.
♂ (ds), Lam Dong, Vietnam. (photo by K.Saito)		♀ (ds), Lam Dong, Vietnam. (photo by K.Saito)
♂, Chiang Mai, Thailand.		♂, Yala, Thailand.

ON : Zizera usta Distant, 1886 OD : Ann. Mag. nat. Hist. (5)17:531-532. TL : Malacca. Distribution : Sikkim to Myanmar, Thailand, Laos, Cambodia, Vietnam, Yunnan, Hainan, W.Malaysia, {Singapore}, Borneo, Sumatra, Sulawesi.

[ THAILAND ]
Una usta usta ; Shirôzu & Saigusa,1962 : 79-81, pl.14, figs.109,♂,110,♂(Un), Textfig.39,♂genitalia. (Doi Inthanon)
Una usta usta ; Pinratana,1981 : 67, pl.11, figs.5,♂,6,♂(Un). (Chiang Mai; Ranong; Yala)
Una usta usta ; Ek-Amnuay,[2007] : 586, pl.265, figs.L150,♂(left),♂(left,Un). (in part)
Una usta usta ; Ek-Amnuay,2012 : 610, pl.276, figs.L175,♂,♂(Un). (Wiang Pa Pao)
Una usta usta ; Okamoto et al.,2013 : 6. (Kanchanaburi: Mae Klong Station)
Una usta usta ; Kimura et al.,2014 : 155, figs.♂,♂(Un),♂,♂(Un). (Chiang Dao; Doi Inthanon; Khun Lao; Maethro; Than To WF.)
Una usta usta ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs. (Chiang Mai; Phetchabun; Phetchaburi) (accessed: 2023.09.19)
Una usta usta ; Küppers & Janikorn,2020 : 169, figs.Abb.L-239-237. (Phang Nga)

[ LAOS ]
Una usta usta ; Motono & Negishi,1989 : 73, pl.104, figs.A5,♂,A6,♂(Un). (Vang Vieng; Phatong)
Una usta usta ; Osada, Uémura & Uehara,1999 : 216, pl.112, figs.♂,♂(Un). (Phong Saly; Oudomxay)
Una usta usta ; Nakamura & Wakahara,2012 : 52.
Una usta usta ; Onodera,2022 : 82, pl.212, figs.♂,♂(Un),♂,♂(Un). (Oudomxai)

[ CAMBODIA ]
Una usta ; Onodera,2008 : 61. (Mondolkiri: Bousra)
Una usta usta ; Chartier & Kosterin,2022 : 121. (Koh Kong; Mondulkiri)

[ VIETNAM ]
Una usta usta ; Miyazaki, Saito & Saito,[2007] : 57, figs.L-66,♂,♀. (Lam Dong: Dambri; Dai Duc Me; Madagui)
Una usta usta ; Monastyrskii & Devyatkin,2015 : 54. (C: Kon Thum; Lam Dong / S)

[ THAILAND ]
Chiang Rai : 1♂ (photo).

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Dec

Chiang Mai : 10♂ (incl. photo).

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Lampang : 6♂ (incl. photo).

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Nan : 1♂ 1♀.

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Ranong : 1♂.

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Yala : 5♂ (incl. photo).

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[ VIETNAM ]
Lam Dong : 2♂ 1♀.

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The butterfly is locally not rare in montane forests at low to moderate elevations (Alt. 50 - 1700m). Males frequently come to the banks of streams and puddles to suck water.
Individuals occur during the dry season frequently have extremely reduced markings on the underside.

Distant, W.L.,1886 : Contributions to a Knowledge of Malayan Entomology. Part V.
Ann. Mag. nat. Hist. (5)17:530-532.

♂ (ds), Lampang, Thailand.	♂, Chiang Mai, Thailand.
♂, Yala, Thailand.	♂ (ds), Lampang, Thailand.

1999.07.11 - 2023.09.30.