Photo of Bug Bluff by Gerlinde Rode of Reich der Spiele. Used with kind permission.
From Board Game Geek:
Players try to give as many cards as possible to other players. First player to get a set of four cards depicting the same bug loses the game. Players give cards to each other face down. The receiving player can believe or doubt, and if they're correct, the giver takes the card, otherwise they take it. They can also pass the card to third player, who is then faced with the same judgment. First player who gets a four-of-a-kind or uses up all cards in hand loses the game.