A Revision of the Flies of the Genus Rivellia (Otitidae, Diptera) of America North of Mexico.
Washington, D. C.: Smithsonian Institution, 1956. 6 x 9 3/4". 60 pp. Some pages still stuck together at top. B&w illustrations. Cover scuffed , very small stain on front. Natural history of insects. Very Good Pamphlet (Item ID: 20434)