The rust-red flour beetle

Latin: Tribolium castaneum (synonym: T. navale).

This beetle differs from the confused flour beetle by the three external antennae joints being much thicker than the ones of said beetle. The antennae joints of the confused flour beetle are gradually thicker toward the tip. Both in terms of biology, harmfulness and extermination the rust-red flour beetle is closely related to the previous mentioned species. Temperature-wise, it prefers a few degrees more and is accordingly to this the more common of the two species in tropical regions. In the temperate parts of the world it is not as common as the confused flour beetle. With a monthly multiplication rate at about 70, it holds the record of the insects in this book.

Rust-red flour beetle

( Latin: Tribolium castaneum)

This is very like the preceding species, but is a little smaller and darker. It has similar habits, but requires even more warmth, and in an unheated warehouse will probably die during the winter in northern Europe.