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Tribe Megacephalini - Big-headed Tiger Beetles

Shiny - Tetracha virginica Tiger Beetle - Tetracha virginica Tetracha at black light, dorsal view - Tetracha carolina Tetracha virginica - male Green metallic beetle - Tetracha virginica Tetracha carolina Tetracha virginica - male - female Tetracha Carolina, Carolina Metallic Tiger Beetle - 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)
Synonyms and other taxonomic changes
Megacephalini Laporte, 1834

*Includes Omini (used in (1))
Numbers
Three genera with 14 species in our area.

Genera:
Identification
Key to genera: [constructed using (2) & (1)]

1a. Dorsum more or less metallic, with pale antennae and legs; hind coxae contiguous; eyes large ..... Tetracha
1a. Dorsum dark brown or black, with dark antennae and legs; hind coxae separated; eyes small ...... 2

2a. 20 mm or larger; scrobe with several long setae; found in southwest and central U.S.A ..... Amblycheila
2b. Usually less than 20 mm; scrobe without setae; found from British Columbia to central California ..... Omus
Range
Omus and Amblycheila are only found in the Western Hemisphere; Tetracha and Megacephala are found in Americas/Palaearctic/Australian/Afrotropical areas. (1)
Remarks
Omus and Amblycheila are flightless. All three genera are crepuscular or nocturnal, in contrast to most tiger beetles with are diurnal. (1)
Tetracha used to be included in the genus Megacephala..
Internet References
Works Cited
1.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.
2.A Field Guide To The Tiger Beetles Of The United States And Canada
David Pearson, C. Barry Knisley, Charles J. Kazilek, David L. Pearson, Barry C. Knisley. 2005. Oxford University Press.