11 



and the caterpillars of Vanessa milherti^ but entirely without effect. 

 These experiments were repeated by using the liquid diluted to \ of 

 the full strength, but without success. 



I had no opportunity to try this substance on cut-worms, but I do 

 not understand how it could kill them beneath the ground if it is 

 simply sprinkled on the ground, when it did no injury to the larvae 

 of the Colorado potato beetle even when they were immersed in it. 



THE HORN FLY. 



{Baematobia serrata, R.-Desv.) 



The Horn Fly has now become so abundant in many parts of Mas- 

 sachusetts and is giving so much trouble that at the winter meeting 

 of the Board of Agricultuie, held at Great Barrington in December, 

 1893, it was voted to request the entomologist of the Hatch Experi- 

 ment Station to prepare a bulletin giving information concerning this 

 insect, with illustrations and remedies. 



The Horn Fly was first described by Robineau-Desvoidy in 1830, 

 from southern Europe, and at the present time is not uncommon on 

 cattle in England, but is believed to be harmless as stated by Mr. G. 

 H. Verrall, in the Entomologist's Monthly Magazine, Vol. 29, p. 

 291, 1893. 



The first report of its occurrence in this country, so far as I am 

 able to learn, was by Dr. S. W. Williston in the Entomologica Amer- 

 icana, Vol. 5, p. 181, 1889, where he states that the first specimens 

 of this remarkable fly were sent to him by Prof. Cope, through Prof. 

 Comstock, nearly two years previous, or in 1887. In 1888, it was 

 reported in New Jersey, Pennsylvania, Delaware, Maryland and 

 West Virginia ; in 1891, in Massachusetts, Mississippi and Kentucky ; 

 in 1892, in Michigan, Canada, Louisiana and Iowa, and it is now 

 pretty well distributed over the United States. 



