Hypercompe conspersa (Walker, 1866) is not a synonym of Elysius conspersus Walker, 1855.
Hypercompe conspersa (Walker, 1866) seems to be a different species, described from Bogota, Columbia. About Hypercompe conspersa we know only the original description.
see
https://www.inaturalist.org/observations/36766896#activity_comment_4675708