202 For'iy-FjFth Report on the State Museum. 



else that had been used — perhaps twenty different insecticides — had 

 entirely failed. The sludge-oil soap was the only material that would 

 conquer these insects, in the experience of Professor Smith. Col. 

 Pearson, of Vineland, who has so long and faithfully been experiment- 

 ing with methods for controlling the rose-bug, also had most grati- 

 fying success in the use of this valuable insecticide. It therefore 

 appears, that in the use of kerosene emulsion and sludge-oil soap, we 

 have two reliable insecticides with which we are able to control tJie 

 ravages of this pes-t of the horticulturist and fruit-grower, whenever it 

 does not appear in overwhelming numbers. In New Jersey, a success- 

 ful fight against it can only be made in the discovery and breaking up 

 of its breeding grounds. 



In Insect Life, ii, Marcli, 1890, pp. 295-302, Dr. Riley has given a 

 quite full account and excellent figures of this insect. The figure 

 illustrating the beetle is given herewith: the details of structure will 

 be readily understood without special reference to them. 



Professor Smith has also given in Bulletin 82, July 3, 1891, of tlie 

 New Jerse}^ Agricultural Station (40 pages, 10 figures), and in the 

 Annual Report of the Station for 1891, an excellent account of ''The 

 Rose Chafer or Rose Bug," containing many new observations, and 

 detailing, in 22 pages, the numerous experiments made by him for its 

 destruction or prevention of its ravages. 



The Maple-tree Borer, Glycobius speciosus (Say). 

 From Mr. Henr}'^ Herrick, of Amsterdam, N. Y., the following 

 inquiry was received, dated Sept. 23d, 1891: 



Grubs or Avorms are destroying my maple shade trees. They either 

 work around the trunk under the bark, or in an upward direction for a 

 yard or more and then go into the wood to the depth of four or five 

 inches. I have had a man to cut out the dead bark and trace them to 

 the hole, where I can insert a stick in many cases for five inches. I 

 would like to know what I can put in the hole to kill the grub without 

 harm to the tree. A stick or a wire may fail to reach him in the bur- 

 row from its not being straight. Can I throw something in M'ith a 

 syringe that will do the work ? 



Mr. Herrick was answered: It will not be worth your while to 

 attempt to kill the grubs in your maples by injecting an insecticide. 

 The long burrows contain no grubs, they all having emerged from the 

 trees through holes in the bark in July. At the present time all of the 

 grubs are within easy reach of your knife. Their location in the tree, 

 if you will go carefully over the bark, may be discovered, as Dr. Pack- 

 ard has told us, by "a rusty, irregular discoloration of the bark of 

 about the size of a cent, and especially by the frass or castings, which, 



