Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Calosoma externum - Narrow Searcher

Calosoma externum - Narrow Searcher - Calosoma externum Calosoma externum - male 9015863 Calosoma - Calosoma externum Calosoma externum? - Calosoma externum - female Calosoma externum? - Calosoma externum Calosoma (Callitropa) externum (Say, 1825) Male ? - Calosoma externum - male Calosoma externum (Say) - Calosoma externum
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Adephaga (Ground and Water Beetles)
Family Carabidae (Ground Beetles)
Subfamily Carabinae
Tribe Carabini
Genus Calosoma (Caterpillar Hunters)
No Taxon (Subgenus Callitropa)
Species externum (Narrow Searcher)
Explanation of Names
Calosoma externum (Say 1825)
24-35 mm
Very large, black with margins of elytra and pronotum brilliant blue. Elytra with evenly-spaced rows of punctured grooves (striae) and a few large punctures (foveae). Pronotum rounded, not flared out on the apical (head) end.
Resembles Carabus sylvosus, which is smaller, and has a differently-shaped pronotum--more flared on the apical end.
e. US (VT-GA to NE-TX); strays into southernmost ON(1)
Woodlands and adjacent open country
May & Jul-Aug in NC; May & Sep-Oct in SC; May-Oct in IN(2)
Adults predatory, climb trees in search of prey, esp. caterpillars.
Life Cycle
Adults hibernate
See Also