Thanks, Sunny for the investigating work for this other Tagiades species.
Looking at the plate for T. litigiosus at http://www.hkls.org/butt-hesperiidae.html#
it seems that only the female has this feature that the hindwing marginal spots are "fused" together. I just wonder whether the same is true for T. ultra that the two sexes have such a distinction?

Horace