9 



father's garden they were quite destructive to Lettuce in the early 

 part of the present season. As the Editor mentioned above named 

 these larvae Celery Worms in one of his editorials, I have thought 

 it best to accept his name. 



The various kinds of Canker-worms were very scarce the present 

 season in orchards where they appeared in large numbers in past 

 years. 



The Apple Plant-louse {Aphis mall, Fabricius) was very abundant 

 early in the season, but the rains which came on later in the season 

 greatly lessened their numbers. I have frequently destroyed whole 

 colonies of these insects by drenching them occasionally with pure 

 cold water. 



Several other insects, many of which have not been reported as 

 occurring in destructive numbers, appeared in considerable num- 

 bers, sometimes committing extensive ravages ; but as these are 

 mostly treated of in the following pages an account of them here 

 would be superfluous. 



As several entomologists, in determining the insects treated of in 

 their reports, have made mistakes in their determinations, I have 

 made it a rule to have my insects determined by some person who 

 makes a certain group of insects his special study, except in cases 

 where the insect differs widely from any other, and has been de- 

 scribed at some length in some work on entomology to which I have 

 access. And in this connection I desire to express my thanks to 

 the following gentlemen for favors received by way of determining 

 insects: Prof. C. H. Fernald, A. B. Grote, E. F. Cresson, Dr. A. 

 S. Packard, Jr. ; H. A. Hagan, P. E. Uhler, and Dr. Geo. H. Horn. 



And above all I am indebted to you for a great many favors re- 

 ceived, and for which I fear I shall never be able to make anything 

 like an adequate return. 



Very respectfully, 



D. W. COQUILLETT. 



Woodstock, III., Dec. 28, 1881. 



