01174cam a22002891 4500 agr23000556 DLC 20260227110943.0 791112s1922 ohuaf b 000 0 eng c agr23000556 (OCoLC)5685367 U.S. Dept. of Agr. Library ViU DLC premarc AS36 .L592 no. 22 396.8L77 no.22 Murphy, Helen Elizabeth, 1892- Notes on the biology of some of our North American species of May-flies. [By] Helen E. Murphy. [Cincinnati, 1922] 46 p. illus., plates. 27 cm. Bulletin of the Lloyd Library of Botany, Natural History, Pharmacy and Materia Medica, no. 22. Entomological series, no. 2 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. I. The metamorphosis of May-fly mouth parts.--II. Notes on the biology of May-flies of the genus Baetis. Mayflies. 8842 8842