""The Hypopygium of the Dolichopodidae"" is a scientific book written by Robert Evans Snodgrass and published in 1904. It is a detailed study of the hypopygium, which is the external reproductive organ found in male insects of the Dolichopodidae family. The book provides a comprehensive description of the hypopygium's anatomy, including its various parts, their functions, and their relationships with other parts of the insect's body. The author also...