Ambulyx elwesi Druce, 1882, Entomologist's mon. Mag. 19: 17. Type locality: [India, West Bengal,] Darjiling [Darling].
Synonym. Ambulyx elwesi Druce, 1882.
Wingspan: 100mm. Superficially similar to a very dark Callambulyx rubricosa rubricosa but differing markedly in genital and other morphology. Frenulum present but reduced in length; retinaculum absent. Subapical pair of hindtibial spurs absent. Forewing upperside with distal two-thirds dark and proximal one-third green (turning brown in a humid atmosphere) and much paler. Hindwing upperside with deep pink basal area and a dark, almost black distal two-thirds in which a narrow lunate purple patch is discernible.
In Thailand, May to July at 700-1000m altitude.
Larval hostplants. Unknown.
Northern Pakistan (Rafi et al., 2014), northern India, Nepal, southwestern China, Burma/Myanmar, northern Thailand and northern Vietnam.