Keys to the parasites of the Hessian fly based on remains left in the host puparium
By: by C. C. Hill and J. S. Pinckney.
Contributors: Pinckney, J. S. 1901-1940.; United States. Dept. of Agriculture.
Series: Technical bulletin / United States Department of Agriculture -- no. 715; Technical bulletin (United States. Dept. of Agriculture) -- no. 715.
Publisher: U.S. Dept. of Agriculture
Published: 1940
Place of publication: Washington, D.C
Language: eng
Number of pages: 24
Subjects: Hessian flies -- Parasites -- United States; Host-parasite relationships; Parasitic insects -- United States -- Classification; Parasites -- United States
Genres: Classification.
Notes: Caption title.

"January, 1940."