The common scorpionfly has a black and yellow body, with a reddish head and tail. In the male has a pair of claspers at the end of its tail (for holding the female during mating), giving it a scorpion-like appearance, although there is no stinger. It has a wingspan of about 35mm. The head is drawn into a prominent, downward pointing beak, with the mouthparts at the tip. The eyes are large. The wings are mostly clear, but have many dark spots or patches.
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