Byasa laos

Byasa laos (Riley & Godfrey, 1921)


♂ (ws), Khammouan, Laos (photo by A.M.Cotton)		♀ (ws), Khammouan, Laos (photo by A.M.Cotton)

♂ (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.

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.
Byasa laos ; Onodera,2022 : 3, pl.7, figs.♂,♂(Un), pl.8, figs.♂,♂(Un),♀,♀(Un). (Khammouan: Thakhek; Nahin)

Specimens Examined

[ LAOS ]
Bolikhamxai : 69♂ 18♀.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Khammouan : 47♂ 54♀.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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.


♂, Khammouane, Laos. (photo by K.Phongpiyamit)

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

1996.09.26 - 2023.05.31.