These two beetles are often grouped together due to
the similarity in their appearance, biology, and behavior. The
confused flour beetle was named because of the confusion
over its identity. The red flour beetle is named after its rust-
red color. The two can be easily separated based on anten-
nal characteristics. The antennae of the red flour beetle is
distinctly club-like, with a three-segmented club. The club of
the confused flour beetle antennae is four segmented and
forms the club gradually. Another slight difference is in the
shape of the thorax. The sides of the red flour beetle are
curved, whereas the thorax of the confused flour beetle is
straight. Both species are cosmopolitan in their distribution.
Adult beetles are approximately 3.5 mm (1/7”).
Larvae of both species are nearly indistinguishable. They
are a light honey color and about 6 mm (1/4”) long. The head
and a distinctive forked process at the tip of the abdomen are
slightly darkened.