Source: The Great Interpretation of Dreams (Ibn Sirin)
A beetle in a dream is an ugly, slandering woman. It may indicate a filthy enemy.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A beetle indicates a man of bad character. Killing it indicates triumph over an enemy.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A beetle is interpreted as worry. Whoever sees himself killing it, his worry will vanish.