Firefly is a term popularly used for certain tropical American click-beetles (Pyrophorus), due to their power of emitting light.
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The cucujo or Cuban firefly (Pyrophorus noctilucus) gives out so strong a light that a few of them serve effectively as a lantern.
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The genus Pyrophorus contains about ninety species, and is entirely confined to America and the West Indies, ranging from the southern United States to Argentina and Chile.