Coleoptera - Beetles - margygreen
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predaceous diving beetle, Thermonectus nigrofasciatus (Dytiscidae) with subelytral air chamber bubble. Mendoza Canyon, King Anvil Ranch, Pima Co., Arizona USA

predaceous diving beetle, Thermonectus nigrofasciatus (Dytiscidae) with subelytral air chamber bubble. Mendoza Canyon, King Anvil Ranch, Pima Co., Arizona USA