THE SNOW-WHITE LINDEN MOTH 63 



been, then why may we not legitimately expect a great deal of our native 

 birds in this respect ? Undoubtedly one of the most efficient and feasible 

 means for the control of this insect in our forests will be the better 

 protection of our native birds. 



METHODS OF CONTROL 



In the control of this pest in shade-trees, spraying with arsenate of 

 lead, 3 pounds to 50 gallons of water, would probably be very effective. 

 If it ever becomes injurious to apple trees in this State, the same method 

 of control would have to be followed. The trees should be sprayed 

 early while the caterpillars are small, as the poison will be much more 

 effective then. 



As we have already noted, the caterpillars have the habit of sud- 

 denly dropping to the ground in great numbers when the trees are jarred. 

 On small trees, hundreds of the caterpillars may be jarred on to sheets 

 and then destroyed. Unfortunately, the young larvae are not so sus- 

 ceptible to this kind of treatment, and if one waits until they become 

 large much of the damage will already have been done. 



Tho masses of eggs are very conspicuous objects and could easily 

 be found on the branches and scraped off. In the case of small trees 

 much good could be accomplished in this manner. On large trees it 

 would be more difficult to collect the eggs. 



In forests there seems no practicable way of controlling this pest. In 

 case of the particular forest area mentioned at Cooks Falls, the wood 

 is being grown for the manufacture of certain wood chemicals. In this 

 instance it may be best to cut off the present growth of timber and 

 use it for the distillation products before it dies as a result of the annual 

 defoliation to which it has been subject for the past two years. 



BIBLIOGRAPHY 



1806. Hiibner, J. Samml. Exot. Schmett., ii. Taf. 429. (Lists Eudalimia 



subsignaria.) 



1855. Harris, T. W. Mag. of Hort. (Hovey). Vol. 21, pp. 418-423. 

 1857. Guenee. Lepidopteres nocturnes. Vol. IX, p. 181. (Description of 



moth and larva.) 

 1860. Morris, J. G. Cat. of the Descr. Lep. of N. A., J>. 56. 



1860. Walker, F. List of the Lepidopterous Insects in the British Museum, 



Vol. 20, p. 209. 



1861. Jones, J. B. Proc. Ent. Soc. Phil., i, p. 31. (Report on the measure 



worm.) 



1861. Glover, Townend. U. S. Dept. Agri. Rpt., p. 554. (Mentioned.) 



1862. Graef and Weibe. Rpt. Brooklyn Hort. Soc., 1862. (Report on the 



measure worm.) 

 1868. Packard, A. S. Amer. Nat. II, p. 333. 



1869. Guide to the Study of Insects, p. 321. 



1872. Lintner, J. A. Ent. Contrib., i, p. 77' (Listed.) 

 1874. Leconte, J. L. Pop. Sc. Month., 1874, p. 381. 



