A TEXT-BOOK 



AGEICULTURAL ZOOLOGY 



FEED. V. THEOBALD, M.A. (Cantab.), F.E.S. 



Professor of Agricultural Zoology. London University; Viet -Principal and Zoologist of the 



S.-E. Agricultural College; Grand Medallist and Hon. Member of the So(Mt6 



Nationale d'Acclimatation de France; Hon. Member Soci6t6 de Pathologle 



Exotique, Paris, the Association of Economic Entomologists of 



America, the Royal Horticultural Society; Fellow of 



the Society of Tropical Medicine ; Imperial 



Ottoman Order of the Osmanieh, &c. 



SECOND AND REVISED EDITION 



WILLIAM BLACKWOOD AWD SONS 



EDINBQRGH AND LONDON 



1913 



