Notes on the biology of some of our North American species of May-flies. - Murphy, Helen Elizabeth, 1892- ([Cincinnati, 1922)
I. The metamorphosis of May-fly mouth parts.--II. Notes on the biology of May-flies of the genus Baetis.
Descriptive letterpress on versos facing the plates.
Contribution from the Limnological Laboratory, Cornell University.
Also issued as thesis (PH. D.) Cornell University, 1920.
Bibliography: p. 23-26.
Keywords: Mayflies