You don't have the heterometrus revision papers? Most of the differences lie in the granulation on the caprice. That's how I distinguished my H. laoticus from all others. The papers may not distinguish all species seeings I didn't read the full set, but it helped me fairly quickly trying to identify the almost identical spinifer/laoticus/longmanus.one day we need to get everyone with diff Heterometrus spp. and make a document on which species look like what,
sooo confusing ;(