♂, Chiang Mai, Thailand.		♀, Chiang Mai, Thailand.
♂, Chiang Mai, Thailand.		♂ genitalia, Chiang Mai, Thailand.

ON : Aeromachus dubius impha Evans, 1943 OD : Proc. R. ent. Soc. Lond. (B)12(7/8):100. TL : "Imphal, Manipur" [Imphal, Manipur State, NE.India]. (NHML) Distribution : Nepal, Manipur to Myanmar, Thailand, Laos, Cambodia, Vietnam, Hainan, Yunnan.

Type ♂, Jun.1911. Imphal, Manipur. 2000 ft. H.C.Tytler (NHML)

[ THAILAND ]
Aeromachus dubius impha ; S.Sophonviwatkul, C.Sunthornwiphat & T.Laola,2015- : Butterflies of Thailand, figs. (Phetchabun) (accessed: 2023.07.13)
Aeromachus dubius impha ; Saito & Inayoshi,2018 : 39, figs.128,♂,♂(Un). (Chiang Mai; Nan; Phetchabun)

[ LAOS ]
Aeromachus dubius impha ; Motono & Negishi,1989 : 80, pl.112, figs.B1,♂,B2,♂(Un),B3,♀,B4,♀(Un). (Nam Moh; Pakse)
Aeromachus dubius impha ; Osada, Uémura & Uehara,1999 : 222, pl.137, fig.♂(Un), (Nam Tha)
Aeromachus dubius impha ; Nakamura & Wakahara,2012 : 58.
Aeromachus pygmaeus ; Onodera,2022 : 109, pl.247, figs.♀,♀(Un). (Oudomxai)

[ CAMBODIA ]
Aeromachus dubius ; Onodera,2008 : 60. (Mondolkiri: O Rang)
Aeromachus dubius impha ; Chartier & Kosterin,2022 : 125. (Mondulkiri)

[ VIETNAM ]
Aeromachus dubius impha ; Evans,1949 : 244. (Tonkin)
Aeromachus dubius impha ; Inoué & Kawazoé,1966 ; 88, figs.75,♂,76,♂(Un),77,♀,78,♀(Un). (K-241 (Djiring and Dalat); Dalat; Kontum)
Aeromachus dubius impha ; Devyatkin & Monastyrskii,1999 : 164. (N: Cao Bang)
Aeromachus dubius impha ; Monastyrskii & Devyatkin,2015 : 76. (N / C to Lam Dong)

[ THAILAND ]
Chiang Rai : 1♂.

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Chiang Mai : 14♂ 4♀ (incl. photo & photo by A.Giudici).

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Lampang : 1♂ 2♀.

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Nan : 2♂ (incl. photo).

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Phetchabun : 1♂ (photo).

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New to Thailand. The first discovery is taken photo by Supat Sophonviwatkul on 27.Jun.2013 in Khao Kho dist., Phetchabun.
The butterfly is locally common in secondary and montane forests at low to moderate elevations (Alt. 350 - 1200m). Males are territorial on undergrowth. Both sexes visit flowers and males occasionally come to the banks of streams and puddles to suck water.

Evans, W.H.,1943 : A Revision of the Genus Aeromachus de N. (Lepidoptera: Hesperiidae).
Proc. R. ent. Soc. Lond. (B)12(7/8):97-101.

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.

♂, Chiang Mai, Thailand.
♂, Nan, Thailand.	♂, Chiang Mai, Thailand.
♂, Chiang Mai, Thailand.

1999.09.04 - 2023.07.31.