The adult Ferruginous bee-grabber grows up to 8–13 millimetres (0.31–0.51 in) long. The body is mainly reddish-brown or yellow-brown. The head is yellow, quite large and inflated-looking, with a kind of bubble at the front and narrow cheeks. The short antennae are brown, their second segment has the same length or it is longer than the third. The large eyes are reddish. The legs and also the last abdomen segments are often darkened. The abdomen is long, round in cross-section, the seventh segment is oblong and conical. When in resting position the abdomen is usually folded forward. In the females theca is hardly distinguishable. The wings are transparent, but reddish-yellow colored at the base.
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