Arhopala pseudomuta, Raffles's oakblue, is a species of butterfly belonging to the lycaenid family. It was described by Otto Staudinger in 1889. It is found in Southeast Asia - Peninsular Malaya, Singapore (A. p.)pseudomuta), Langkawi, Mergui, Burma, Thailand (A. p. ariavana Corbet, 1941), Sumatra, Borneo (A. p. contra (Evans, 1957))
A. pseudomuta is much larger than elopura, the male violettish-blue, almost-lilac, the under surface regularly marked, as is to be seen from the figure; Malacca, Borneo. A. rafflesii Nic. [synonym] above dark blue instead of violet, with a slight difference of the postmedian band on the hindwing beneath, where the 4th spot is slightly removed towards the margin.
The English name honours Stamford Raffles.