The Association of Economic Biologists 



President 



Professor NEWSTEAD, F.R.S. 



Vice-Presidents 



Professor CARPENTER, M.R.I.A. 

 Professor STANLEY GARDINER, F.R.S. 

 Professor HICKSON, F.R.S. 

 R. STEWART MacDOUGALL, D.So. 



Council 



Prof. B. T. P. BARKER A. D. IMMS, D.Sc. 



S. E. CHANDLER, D.So. Prof. W. MAXWELL LEFROY 



F. J. CHITTENDEN G. A. K. MARSHALL, D.Sc. 



A. D. COTTON Prof. W. J. PLIMMER 



E. E. GREEN A. G. L. ROGERS 

 Prof. P. GROOM, D.Sc. 



Hon. Treasurer 



J. C. F. FRYER, Esq., 



Craven House, 



Northumberland Avenue 



Hon. Secretary 



S. A. NEAVE, Esq., 



89, Queen's Gate, S.W. 7 



CONTENTS OF Vol. IV, Nos. 1 and 2 



FAQB 



1. Frit Fly {Oscinus Frit) attacking Winter Wheat. By F. R. Pether- 



BRIDGE . 1 



2. Some Farm Insects observed in the Aberystwyth Area, 1913-1916. 



By C. L. Walton, M.Sc 4 



3. A Note on Agricultural Oecology in Mid-Wales. By C. L. Wal- 



ton, M.Sc 15 



4. On a Disease of the Beech caused by Bulgaria Polymorpha Wett. By 



R. J. Tabor, B.Sc, and Kate Barratt, M.Sc. (With Plate I.) 20 

 6. The Life History and Economy of the Cheese Mites. By Nellie B. 



Eales, B.Sc. (Lond.). 28 



6. Investigation of Bulb Rot of Narcissus. Part I. The Nature of the 



Disease. By E. J. Welsford, F.L.S. (With Five Text-Figures.) 36 



7. Notes on a Plague of Psocids in a Factory. By R. A. Harper 



Gray, M.A., B.Sc. (Agi-ic), M.Sc 47 



8. A Bacterial Blight of Pear Blossoms occurring in South Africa. By 



Ethel M. Doidge, M.A., D.Sc, F.L.S. (With 7 Text-Figures.) 50 



9. A List of the Coccidae affecting various Genera of Plants. By 



E. Ernest Green 75 



10. Note on the Immunity of Chalcid Parasites to Hydrocyanic Acid Gas. 

 By E. Ernest Green 



90 



