Got this from a herp shop. This has got to be the longest roach I've ever seen... at 3" 3/4'! I'm sure when I feed him a little could reach 4"...
The shop keeper doesn't know the ID, and told me this batch of stock were of European origin. I've compared it with my "giant trait" normal hissers (G. portentosa) and the horn structure is definitely different. He has a mostly deep maroon color (apart from plate#1), and plate #2 and #3 have yellow/orange highlights on the edges. Where the normal hissers have those black dots along the abdominal plates, the uniform maroon coloration remain.
Could it be Princisia vanwaerbecki?