Synopsis of the North American Syrphidae
By: by Samuel W. Williston.
Series: CIHM/ICMH Microfiche series -- no. 28166
Publisher: G.P.O.
Published: 1982
Place of publication: Washington
Language: eng
Format: Microform
Number of pages: 209
Subjects: Syrphidae.; Diptera -- North America.
Other titles: Bulletin of the United States National Museum.
Notes: Added t.p.: Bulletin of the United States National Museum, no. 31.

Includes index.

Filmed from a copy of the original publication held by the Library, National Museums of Canada. Ottawa : Canadian Institute for Historical Microreproductions, 1982.