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Species Calleida decora

Dark metallic green - Calleida decora Calleida decora Calleida decora (Fabricius) - Calleida decora A decorous Mississippi beetle - Calleida decora Calleida decora TX 8mm Green, Orange & Black Beetle - Calleida decora Ground Beetle - Calleida decora Beetle - Calleida decora - male - female
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 Harpalinae
Supertribe Harpalitae
Tribe Lebiini
Subtribe Calleidina
Genus Calleida
No Taxon (subgenus Calleida)
Species decora (Calleida decora)
Explanation of Names
Calleida decora (Fabricius 1801)
Identification
Adult head black, pronotum orange, elytra green with punctate striations; head and pronotum narrower than body; antennae filiform, twice as long as head, basal third pale - distal portion black, short hairs at base of each segment; "knee joints" blackish and remainder of femur and tibia yellowish-orange on all legs

The key below [slightly modified from(1) by Peter W. Messer 5.vii.2010] is for separating the similarly colored C. punctata and C. decora which usually cannot be distinguished without microscopic examination. See background discussion of the need for accurate species identification.
Head densely punctate with short pubescence. Eyes small and flat, horizontal diameter not exceeding length of temples (head behind eyes). Elytra very shiny, microsculpture obsolete. Tarsi convex dorsally, not furrowed. Internal sac of penis without flagellum. Colored as C. decora. Range: eastern half of North America but questionably into southern coastal states. 7.0–8.5 mm. ==> C. punctata LeConte
Head glabrous (except for normal supra-orbital setae). Eyes large and prominent, their diameter much longer than temples. Elytra luster dull from strong, regularly isodiametric microsculpture. Tarsi dorsally flattish with longitudinal furrow. Penis with long flagellum coiled into the basal bulb when in repose. Colored as C. punctata. Range: securely in the southeastern States, questionably into the midwestern States. 7–9 mm. ==> C. decora (Fabricius)
Range
US (VA-FL to SD-AZ) to Nicaragua; Bahamas(2)
Print References
McWhorter RE, Grant JF, Shepard M. (1984) Life history of a predator, Calleida decora, and the influence of temperature on development. J. Agric. Entomol. 1: 68-77.
Works Cited
1.The ground-beetles (Carabidae, excl. Cicindelinae) of Canada and Alaska, parts 1—6
C.H. Lindroth. 1961. Opuscula Entomologica Supplementa XX, XXIV, XXIX, XXXIII, XXXIV, XXXV.
2.Catalogue of Geadephaga (Coleoptera, Adephaga) of America, north of Mexico
Bousquet Y. 2012. ZooKeys 245: 1–1722.