Just a few more I could not see earlier in the thread. The first line is not really monsters but gods, but they have stats so why not.
294 - Iuz (Demigod), Pholtus (Intermediate God), Rao (Greater God), Tharizdun (Intermediate God) (Beings of Power, David Noonan)
296 - Forest Wurm, Tundra Wurm, Sand Wurm, Swamp Wurm, Sea Wurm, River Wurm, Grassland Wurm, Hill Wurm, Lava Wurm, Storm Wurm, Cave Wurm, Mountain Wurm (The Bestiary: Wurms of the Far Reaches, Will McDermott)
305 - N'gatispawn (Cities of the Planes: N'Gati, James Jacobs)
312 - Demon Turagathshnee (Tanar'ri), Turaglas Turagathshnee Form (Tanar'ri), Turaglas True Form (Tanar'ri) (The Ebon Maw, Ari Marmell)
324 - Hob, Spellshadow, Du'lora Quori (Dark Fury), Hashalaq Quori (Dreamstealer), Kalaraq Quori (Eyebinder) (Living Nightmares, Keith Baker)
324 - Black Ice Golem, Icy Prisoner, Steaming Soldier, Winterling (Chilled to the Bone, Yury Pavlotsky)