Reverse circulation hybrid bit

A method of drilling a subterranean bore hole comprising;

• running in the bore hole a reverse circulation hybrid drill bit;
• pumping a drilling fluid to the bottom of the bore hole through an annulus formed between a drill string and the borehole;
• establishing fluid circulation between the annulus and an interior of the drill string through the drill bit;
• rotating the drill bit to remove formation material;
• circulating the removed formation material from the borehole bottom, through the drill bit and into the interior of the drill string;
• wherein the hybrid drill bit comprises a bit body having a shank portion and at least one fixed blade;
• the shank portion having fluid bore of a predetermined cross sectional area;
• the at least one fixed blade comprising at least one cutting element configured to remove formation material;
• the bit body having at least one rolling cutter assembly disposed adjacent the at least one fixed blade and comprising at least one cutting element configured to remove formation material;
• at least one junk slot define between the at least one fixed blade and the at least one rolling cutter assembly;
• a reverse circulation fluid pathway system communicating from the at least one junk slot to the fluid bore so that fluid and cuttings can be flushed from the junk slots, through the fluid pathway system and into the shank bore.