Calosoma scrutator, also known as the fiery searcher and caterpillar hunter,[1] is a species of ground beetle belonging to the genus Calosoma, subgenus Acalosoma. This beetle can be as large as 35 millimetres (1.4 in) long.[2] The distribution of this species is relatively widespread, but it is nonetheless common in North America.[3] The adult beetle is known to excrete a foul-smelling oil when it is handled. The oil has been described as smelling similar to rotten milk or rancid olive oil.[4]

Calosoma scrutator
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Carabidae
Genus: Calosoma
C. scrutator
Binomial name
Calosoma scrutator
(Fabricius, 1775)


  1. ^ "Fiery searcher, caterpillar hunter". University of Florida. Retrieved 2020-04-18.
  2. ^ "Le forum des insectes - Le coin de l'entomologie". Forum Actif. Retrieved 2020-04-18.
  3. ^ Infos on the "Encyclopædia Britannica Online"
  4. ^ C. scrutator on