Byasa laos  (Riley & Godfrey, 1921)

Byasa laos ♂ Up. Byasa laos ♂ Un. Byasa laos ♀ Up. Byasa laos ♀ Un.
♂ (ws), Khammouan, Laos (photo by A.M.Cotton) ♀ (ws), Khammouan, Laos (photo by A.M.Cotton)
Byasa laos ♂ Up. Byasa laos ♂ Un. Byasa laos ♀ Up.
♂ (ds), Khammouan, Laos ♀ (ds), Khammouan, Laos

ON : Papilio laos Riley & Godfrey, 1921
OD : J. nat. Hist. Soc. Siam 4(3):168, pl.4, fig.1,♂(Up & Un).
TL : Ban Na Sao, French Laos. (NHML)
Distribution : C.Laos.
Byasa laos map

Type Material Information

♂, Type (red), Rh114, Feb.1920. Ban Na Sao, Mekong R., French Laos. (NHML, examined)


Records taken from Literature

[ THAILAND ]
'Papilio laos : Godfrey,1930 : 208. (Mouth of Menam Songkram, Sayaburi (Saiaburi), E.Siam)'
'Atrophaneura laos ; Pinratana,1977 : 16, not fig. (by literature, Godfrey, Songkhram river, Nakhon Panom)'
'Parides laos ; Pinratana & Eliot,1992 : 15,40, not fig. (list only)'
'Atrophaneura laos ; Ek-Amnuay,[2007] : 72, pl.7, figs.P17,♂(Laos,Un),♀(Laos). (along the Mekong River)'
'Byasa laos ; Kimura et al.,2011 : 113. (by literature)'
'Atrophaneura laos ; Ek-Amnuay,2012 : 72, pl.7, figs.P16,♂(Laos,Un),♀(Laos). (along the Mekong River)'

[ LAOS ]
Papilio mencius : Dubois & Vitalis,1921 : 8. (Nam Hin Boun)
Byasa laos ; Masui & Uehara,1997 : 5-6, pl.2, figs.1,♂,♂(Un),♀,♀(Un). (Thakhek)
Byasa laos ; Osada, Uémura & Uehara,1999 : 200, pl.4, figs.♂,♂(Un),♀. (Nhahin; Thakhek)
Byasa laos ; Nimura & Wakahara,2005 : 38. (Thakhek)
Atrophaneura laos ; Cotton & Racheli,[2007] : 185, fig.3, 329-331. (Phou Pha Man)
Byasa laos ; Racheli & Cotton,2010 : 64-65, figs.♂,♂(Un),♀,♀(Un),♂genitalia. (C: Khammouane Province)
Byasa laos ; Nakamura & Wakahara,2012 : 41.


Specimens Examined

[ LAOS ]
Bolikhamxai : 69♂ 18♀.
JanFebMarAprMayJun JulAugSepOctNovDec

Khammouan : 47♂ 54♀.
JanFebMarAprMayJun JulAugSepOctNovDec


Notes

The butterfly is quite localized but is very common in the habitat.
Only one record of the species is known from Thailand, 'Mouth of Menam Songkram, Sayaburi (Saiaburi), E.Siam', by Godfrey,1930. I suspect it might be either an erroneous location or a vagrant. Further distributional research is needed in eastern Thailand.


Literature

Riley, N.D. & Godfrey, E.J.,1921 : Some Undescribed Rhopalocera from Siam.
J. nat. Hist. Soc. Siam 4(3):167-190. 4 pls.


Byasa laos ♂ Byasa laos ♂
♂, Khammouane, Laos. (photo by K.Phongpiyamit)
Byasa laos ♂ Byasa laos ♀
♂, Khammouane, Laos. (photo by K.Phongpiyamit) ♀, Khammouane, Laos. (photo by K.Phongpiyamit)

1996.09.26 - 2021.10.31.

A Check list of Butterflies in Indo-China, Chiefly from THAILAND, LAOS & VIETNAM. Copyright © 1996- Y.Inayoshi.