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Genus Tetracha - Metallic Tiger Beetles

Megacephala carolina - Tetracha carolina Tetracha impressa (Chevrolat) - Tetracha impressa - female Tetracha virginica - female Green metallic beetle - Tetracha virginica Tetracha carolina - male Tetracha virginica - male - female Tetracha floridana Tetracha carolina
Classification
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 Cicindelinae (Tiger Beetles)
Tribe Megacephalini (Big-headed Tiger Beetles)
Genus Tetracha (Metallic Tiger Beetles)
Synonyms and other taxonomic changes
revised by Naviaux (2007)
Formerly treated as subgenus of Megacephala Latreille 1802 (see discussion)
Explanation of Names
Tetracha Hope 1838
name refers to four apical teeth of the mandibles
Numbers
4 spp. in our area, ~100 total(1)
Identification
Large, nocturnal tiger beetles with overall oily-green coloration. North American species are likely flightless. Tetracha virginica is easy to recognize, as its elytra are entirely green, lacking the apical tan marks of the other three species.

Tetracha carolina is widespread in Southeastern United States:

Other species (floridana, impressa) are similar in appearance to carolina, but more restricted in distribution:


Larvae of Tetracha are distinctive in several technical characters, but one apparently consistent field mark is that "lateral and caudal margins of pronotum (are) pearly white" (2). This can be difficult to see due to caked-on dirt, but it is usually visible:
Range
so. US to Argentina
Life Cycle
nocturnal/crepuscular(3), come to lights(3)
Print References
Naviaux R. (2007) Tetracha (Coleoptera, Cicindelidae, Megacephalina); Révision du genre et descriptions de nouveaux taxons. Mém. Soc. ent. Fr. 7: 1-197.
Works Cited
1.Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico
Bousquet Y. 2012. ZooKeys 245: 1–1722.
2.Studies on the morphology, taxonomy, and ecology of the larvae of Holarctic tiger-beetles (family Cicindelidae)
Hamilton, Clyde Carney . 1925. Proc. U.S. National Mus. 65: 1-87.
3.American Beetles, Volume I: Archostemata, Myxophaga, Adephaga, Polyphaga: Staphyliniformia
Arnett, R.H., Jr., and M. C. Thomas. (eds.). 2000. CRC Press LLC, Boca Raton, FL.