Which of the following is NOT an identifying feature of a bed bug?

The identifying features of a bed bug include its small size (typically ranging from 1/6 to 1/4 inch), its reddish-brown color, and the presence of small blood stains on sheets, which are evidence of their feeding habits. These characteristics help in recognizing a bed bug infestation.

The violin-shaped marking is actually a feature associated with another pest, the brown recluse spider. This misidentification results in confusion, as bed bugs do not possess any violin-shaped markings. Therefore, this characteristic does not apply to bed bugs, making it the correct choice for the question regarding what is NOT an identifying feature of them. Understanding these distinctions is crucial for effective pest identification and management.