PREFACE. 
V 
whom I am indebted for much information, and in some 
instances for a great deal of trouble ungrudgingly taken both 
in observation and reporting results. But I should especially 
acknowledge the valuable aid given by Dr. Ch. Lindeman, 
Professor at the School of Agriculture, Moscow, in identifying 
specimens of our British parasites of the Hessian Fly, and in 
presenting me with type specimens of Russian species for 
British service. Likewise I am much indebted to Prof. Riley, 
Entomologist of the Department of Agriculture, U.S.A., not 
only for his valuable help with regard to the Hessian Fly 
parasites, but also for much serviceable information on Hop 
Aphis, and other points communicated both by letter and 
personally during his stay in England. 
To Dr. J. G. de Man, of Middleburg, and to Dr. J. Ritzema 
Bos, Professor of Zoology at the Royal Agricultural College, 
Wageningen, Netherlands, I am under great obligations for 
their skilled assistance, most kindly given in successive exami¬ 
nations during several months relatively to infestation of crops 
by Tylenclms devastatrix; and I cannot omit acknowledgment 
of communication and also of aid whenever sought from my 
valued friends, Mr. J. Fletcher, Entomologist to the Dominion, 
and Prof. W. Saunders, Director of the Government Experi¬ 
mental Farm Stations, Canada, and Mr. Frazer S. Crawford, 
Inspector under the Vine; &c., Protection Act at Adelaide, South 
Australia, and also the long labours of my sister, Miss G. E. 
Ormerod, in translation of German and Spanish Entomological 
papers, whereby she saved me much loss of time in reference. 
I must also acknowledge, with many thanks, the aid given to 
the subject of prevention of injurious insects by the Press, and 
especially by the Editors of our leading Agricultural Journals. 
The illustrations in the present Report are in some instances 
from my own drawings, in some from other sources acknow¬ 
ledged together with the figure, and for others (as before) I am 
indebted to the courtesy of Messrs. Blackie and Son, Glasgow. 
The crop attacks and those to animals are placed in two 
divisions, not classed together alphabetically. In the coming 
season I shall be glad to receive any information bearing on 
serviceable methods of prevention of farm pests, and to reply to 
any inquiries to the best of my power, and I desire to draw the 
