Mimathyma ambica (Kollar)
(=Apatura ambica Kollar)
Taxonomic position
Insecta: Lepidoptera: Papilionoidea: Nymphalidae: Apaturinae: Apaturini
Common name
Indian purple emperor

For more details see I Found Butterflies.
Image
 Collected from Mizoram

(Uploaded on 10.05.2016)