21 



None of trees treated show any indications of injury from the paint ; 

 in fact, from the simple nature of the materials we do not believe it pos- 

 sible that any injury can result. 



The details of this experiment were carried out by Mr. E. P. Felt of the Freshman 

 class. 



Conclusion. 



By the addition of Paris green to such compositions as the above, pro- 

 vided they prove upon further trial to be harmless to the trees, we feel 

 certain some of them will prove an effectual preventive against depre- 

 dations by mice, and will be free from danger except where poultry or 

 small animals may be allowed to remain in the orchard. 



Further reports will be made upon this subject before the close of the 

 season, so that anything discovered in this line may be made use of or 

 thoroughly tested the coming winter. 



Division of Entomology. 



C. H. FERNALD. 



THE GRAPE-VINE LEAF-HOPPERS. 



These insects belong to the order Hemiptera or true bugs, and to the 

 suborder Homoptera. They are of small size, averaging only about one- 

 tenth of an inch in length, and are exceedingly variable. They were first 

 mentioned by Harris in his article " Locust " in the Encyclopsedia Amer- 

 icana, published in 1831, where he gave the name of Tettigonia vitis to 

 one of the species. He also refers to it in his "Insects Injurious to Veg- 

 etation," and states that it does much damage to the grape leaves in this 

 country. 



In 1856 Dr. Fitch, in his "Third Report on the Noxious Insects" in 

 New York, described three species and established for them the genus 

 Erythroneura. His species are vidnerata, tricincta and vitifex. Say 

 had previously described a species under the name of Jei^fp^o/^m hasilaris 

 which has been found on the leaves of the grape at this place. All these 

 species have been referred to the genus Erythroneura by Prof. Uhler, our 

 highest authority on the Hemiptera, but it is more than probable that 

 some of them are only varieties of others. Vine growers generally call 

 hem thrips, vine-hoppers, leaf-hoppers, etc. They all have similar 

 habits, and the same remedies may be used for each. 



These insects are believed to pass the winter in the perfect or adult 

 stage, under bark or leaves, and in the spring deposit their eggs on the 



