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

Discussion of 2018 gathering

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington


Species Calosoma externum - Narrow Searcher

Narrow Searcher - Calosoma externum Calosoma externum - male 9015863 Calosoma - Calosoma externum Calosoma externum (Say) - Calosoma externum Pretty Caterpillar Hunter - Calosoma externum Calosoma externum (Narrow Searcher) - 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