Question Diptera - Rivellia genus

Caught this on the kitchen flyscreen in Sunbury a few days ago
(30/1/22) 2 photos

Noticed this Signal Fly flicking its wings on the laserlite roof of the back porch , this almost constant flicking of the wings is one of their main characteristics along with their large heads and banded eyes (24/11/22) 5 photos

Caught both of these on the laserlite as well (29/11/22) , this pair are quite a bit smaller overall than the previous two , 2 photos of each one .