imoDrcnox to the first edition. 



Though all four of the insects considered iu this Bulletin have oeen 

 studied iu years gone by and have been treated of in various publica- 

 tions, yet some facts of interest are recorded here for the first time. 

 The article oil the Elm Leaf-beetle is reproduced from Bulletin Xo. 6, 

 which has been for some time out of print. Those on the Bag-worm 

 and on the Tussock-moth are condensed from our First Report as State 

 Entomologist of Missouri, published in 1868, and from later writings, 

 and that on the Fall Web-worm is made up from the Third Report of 

 that series for 1870, but contains much' that is new and especially ap- 

 plicable to the District of Columbia, the quoted portions being taken 

 in advance from oar forthcoming report to the Department. The Bul- 

 letin concludes with some facts and suggestions which are also of local 

 interest and have been elicited by the exceptional concern shown by 

 the people of Washington in the caterpillar nuisance. Some portions 

 of this part of the Bulletin have been given for publication to the 

 Washington Evening Star. 



In treating of the means of preventing the injury aud of preserving 

 the foliage of our trees we have gone into details as to the most impor- 

 tant means in considering the first species, or the Elm Leaf-beetle, so as 

 to avoid repetition, and later, in connection with the fourth species or 

 Fall Web-worm, referred briefly to other methods. 



C. V. R. 



