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Calosoma sayi
Large black Ground Beetle with a metallic green sheen. The elytra are striated with orange metallic spots. About 3 cm long. Family Carabidae.
Came to the lights of a store, Axtla de Terrazas near Xilitla, San Luis Potosí, Mexico.
http://www.calosomas.com/Castrida/cal_sa... http://bugguide.net/node/view/25153 http://bugguide.net/node/view/1089062/bg...