I'm not entirely sure but i found mites that looked similar to that (small and light brown) on my A. geniculatta sling and a couple days later she pushed up daisies. It's worth mentioning she was only about a half inch and not very hardy. You might wanna change out his substrate and try and clean him off. I dunno if thats how you actually get rid of mites but it seemed to have dealt with problem in my B. Smithi tank.
Beautiful centipede by the way, i've been looking into getting one too.