When I'm putting together a query for an adventure for Dungeon, I'm always concerned that It'll get rejected because I use monsters that have already been seen enough in recent (or upcoming) issues. Well, I can't predict the future, but I can document the past. Here are all the monsters that have appeared in the past 6 months (issues 118-123), including the issues they appeared in. I made no attempt indicate the *main* bad guys, and where there was a monster like a "male half-fiend hill giant dire wereboar" I generally counted it in all categories. I also tried to list them the way they appear in the monster manual (blue dragons under "D" for dragon). Yeah, I know, I should have used this time to write for Campaign Workbook or something...
Monsters in Dungeon 118-123
Aboleth (121)
Air Mephit (120)
Angel, Astral Diva (119)
Animated Object (119)
Ape (120)
Ashen Husk (120)
Assassin Vine (120)
Baboon (120)
Barbed Devil (123)
Blackstone Gigant (123)
Bloodbloater Swarm (121)
Bodak (119)
Boggle (122)
Bugbear (119)
Carrion Crawlers (119)
Chimera (118)
Chuul (121)
Crawling Head (123)
Cursed Spirit (123)
Death Knight (120)
Demon, Biblith (119)
Demon, Chasme (119)
Demon, Imp (119)
Demon, Succubus (119)
Demon, Vrock (118)
Devil, Ice (119)
Dire Ape (120)
Dire Boar (118)
Dire Jackal (120)
Dire Tiger (118)
Displacer Beast (119)
Draegloth Half-Fiend (121)
Dragon, Blue (118)
Dragon, Black (123)
Dread Guard (122)
Drow (118, 119, 121)
Dryad (123)
Eagle (118)
Eagle, Fiendish (120)
Erivatius (123)
Ettin (119)
Flind (119)
Flumph (118)
Ghost (119)
Ghoul (123)
Ghoul, Lacedon (118, 121)
Gloom (123)
Giant, Frost (118, 119)
Giant, Hill (118)
Giant, Stone (118)
Giant Crocodile (120)
Giant Praying Mantis (122)
Giant Octopus (120)
Giant Squid (123)
Gnoll (119)
Goblin (119)
Golem, Flesh (121)
Golem, Stone (119, 120, 122)
Gorgon (118)
Gray Render (118)
Green Hag (122)
Grick (123)
Hag, Annis (119)
Half-dragon Troll (121)
Half-dragon Moon Elf (121)
Half-fiend (119)
Half-Ilithid (122)
Hellhound, Nessian Warhound (119)
Hobgoblin (122)
Ironmaw (123)
Kaorti (118)
Kenku (120)
Lich (123)
Locust Swarm (120)
Malgoth (119)
Manticore (121, 123)
Marut (123)
Mohrg (119)
Monitor Lizard (122)
Monstrous Centipede (123)
Monstrous Spider (123)
Mummy (123)
Needlefolk (122)
Nightwalkers (122)
Ogre (119, 120)
Ogre Mage (120)
Orc (118, 122)
Purple Worms (122)
Rat Swarm (121)
Roper (118, 119)
Sea Cat (120)
Shadow (121)
Shambling Mound (120, 123)
Sharks (120)
Skeleton (119)
Skeletal Dragon (119)
Skeleton, Wolf (121)
Skum (121)
Slad, Gray (118)
Snake, Constrictor (119)
Spawn of Tharizdun (121)
Spectre (119)
Spiders, Monstrous (119)
Spider Swarm (119, 123)
Sporebats (123)
Stirge (121)
Sword Spider (121)
Thri-kreen (120)
Treant (122)
Troglodytes (120, 122)
Troll (119, 121, 122)
Tyrannosaurus (122, 123)
Umber Hulks (119, 122)
Uvuudaum (123)
Vampire (119, 122, 123)
Vampire Spawn (122)
Velociraptors (123)
Water Elemental (122)
Wereboar (118)
Werejackal (120)
Wight (119)
Will-o-wisp (119)
Worg (122)
Yugoloth, Canoloth (119)
Yugoloth, Mezzoloth (119)
Zombie (120)
Zombie, Orc (123)