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Animalia+%7C+Arthropoda+%7C+Insecta+%7C+Diptera+%7C+Athericidae and Paleontology--Colorado--Teller+County and Naturalists--Colorado and Atrichops+hesperius and Animalia+%7C+Arthropoda+%7C+Insecta+%7C+Diptera+%7C+Athericidae and Animalia+%7C+Arthropoda+%7C+Insecta+%7C+Diptera+%7C+Athericidae by Cockerell%252C+Theodore+D.+A.+%2528Theodore+Dru+Alison%2529%252C+1866-1948%252C+author and Cockerell%252C+Theodore+D.+A.+%2528Theodore+Dru+Alison%2529%252C+1866-1948%252C+author
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