I'm not sure if these were included under different names, but here are some more government types:
-Proletariat Dictatorship
-Republic (not to be confused with a democracy)
-Aristocracy (because who doesn't like Plato?)
-"Prussian Constitutionalism" (i.e. a limited constitutional monarchy)
-Plutocracy (probably the same as a Corporate-State, but I'm not sure)
-Empire (pretty much autocracy, though)
A proletarian dictatorship fits into either a Party-state or a socialist democracy.
I don't see how a republic doesn't fit into demarchy, oligarchy, or parliamentary democracy.
Aristocracy fits into either oligarchy or feudal monarchy.
Constitutional monarchy is intended to represent prussian constitutionalism.
Yes, thats correct.
I don't see how an empire wouldn't just fit into one of the other categories of monarchy.