Defense
C. maxillosus has abdominal defensive glands used to secrete a mixture of substances that act as an irritant to predators. These glands are located beneath the abdominal tergites. When threatened or disturbed, the beetle revolves its abdomen and touches abdominal tip to offender to wipe the glands. Ants (Formica exsectoides) are a common offender and have portrayed that this defense takes place. The ants are shown to be repelled by the four major components of secretion (isoamyl acetate, iridodial, E-8-oxocitronellyl acetate, and dihydroneptalactone). Dihydroneptalactone is the main principal ingredient of chemical defense.
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