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Animalia+%7C+Arthropoda+%7C+Insecta+%7C+Diptera+%7C+Athericidae and Atrichops+hesperius and Naturalists--Colorado by Cockerell%25252C%2BTheodore%2BD.%2BA.%2B%252528Theodore%2BDru%2BAlison%252529%25252C%2B1866-1948%25252C%2Bauthor and Cockerell%25252C%2BTheodore%2BD.%2BA.%2B%252528Theodore%2BDru%2BAlison%252529%25252C%2B1866-1948%25252C%2Bauthor
- UC Boulder