Arhopala atosia is a species of butterfly belonging to the lycaenid family described by William Chapman Hewitson in 1869."Arhopala Boisduval, 1832" at Markku Savela's Lepidoptera and Some Other Life Forms. Retrieved June 8, 2017. It is found in Southeast Asia - Borneo, Sumatra, Bangka, Pulau Laut (A. a. atosia), Thailand, Indochina, Peninsular Malaya, Singapore (A. a. malayana Bethune-Baker, 1903), Burma (A. a. aria (Evans, 1932)), Langkawi, Mergui (A. a. jahara Corbet, 1941) and Palawan (A. a. aricia (Staudinger, 1889)).Evans, W. H., 1957. A revision of the Arhopala group of oriental lycaenidae (Lepidoptera: Rhopalocera) Bulletin of the British Museum (Natural History) Entomology [ISSN], 5(3): 85–141
Above the male is not lilac, but mostly dark blue with a very feeble violet tint, although also more intensely lilac-tinged specimens have been ascertained. Beneath very similar to pseudomuta, but in the female the postdiscal band of the hindwing is more irregular, and the 4th spot of the postmedian band of the forewing still more distally removed. The female has a black distal margin of about 3 mm width. Seitz, A. Band 9: Abt. 2, Die exotischen Großschmetterlinge, Die indo-australischen Tagfalter, 1927, 1197 Seiten 177 Tafeln
Subspecies Arhopala atosia atosia (Borneo, Sumatra, Bangka, Pulau Laut) Arhopala atosia malayana Bethune-Baker, 1903 (Thailand, Indo-China, Peninsular Malaysia, Singapore) Arhopala atosia aria (Evans, 1932) (Burma) Arhopala atosia jahara Corbet, 1941 (Langkawi, Mergui) Arhopala atosia aricia (Staudinger, 1889) (Palawan)
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