Murphy, Helen Elizabeth,  1892- <br/><br/>
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 .
<br/><br/> Descriptive letterpress on versos facing the plates.  Contribution from the Limnological Laboratory, Cornell University.  Also issued as thesis (PH. D.) Cornell University, 1920. 
<br/><br/>Bibliography: p. 23-26. 
<br/><br/>I. The metamorphosis of May-fly mouth parts.--II. Notes on the biology of May-flies of the genus Baetis. 
<br/><br/><label>LCCN: </label>agr23000556  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mayflies.
<br/><br/><label>LC Class. No.: </label>AS36  / .L592 no. 22 
<br/><br/><label>Dewey Class. No.: </label>396.8L77 no.22