What is the 8th 'melakarta" scale?
Dhanyasi:  It is a "janya" rāgam (derived scale) from the 8th "melakarta" scale "Hanumatodi". Hanumatodi:  It is the 8th "melakarta" rāgam (parent scale) in the 72 "melakarta" rāgam system.
Hanumatodi