Contribution to a monograph of the North American Syrphidae
By: by S.W. Williston.
Contributors: American Philosophical Society.
Series: CIHM/ICMH Microfiche series -- no. 28151
Publisher: s.n.
Published: 1983
Place of publication: [S.l
Language: eng
Format: Microform
Number of pages: 22
Subjects: Syrphidae.; Diptera -- North America.
Notes: "Read before the American Philosophical Society, May 19, 1882."

From: Proceedings of the American Philosophical Society, XX, 112.

Filmed from a copy of the original publication held by the Entomology Research Library, Agriculture Canada. Ottawa : Canadian Institute for Historical Microreproductions, 1983.