15 



Tliey also recommend spraying the animals with kerosene emulsion 

 to kill the flies. Mr. H. A. Morgan, entomologist of the Louisiana 

 Experiment Station, who experimented on the Horn Fly in 1892, 

 after spraying the animals with six different preparations, one of 

 which was kerosene emulsion, says he obtained the best results with 

 an emulsion made the same as the kerosene emulsion, but in which 

 he substituted fish-oil for kerosene and in the same quantity. He 

 states that he had equally good results with a weaker emulsion of 

 fish-oil, made as follows : "Dissolve one-half pound of common hard 

 soap in one gallon of boiling water, and while still hot add two 

 gallons of fish-oil, which is thoroughly mixed with the water by 

 churning the whole solution together for four or five minutes. It 

 may be thoroughly mixed by forcing the liquid through a large 

 syringe or force pump for the same length of time. After being 

 thoroughly agitated so as to have the appearance of milk, dilute, 

 using 15 to 20 parts of water to every one part of the solution." 



NATURAL ENEMIES. 



Mr. W. H. Ashmead, in the Proceedings of the P^ntomological 

 Society of Washington has published the description of a new species 

 of Spalangia which belongs to one of the parasitic groups of the 

 Hymenoptera, under the name of Spalangia haematohiae, and states 

 that it was described from a single specimen reared by Dr. Riley, 

 Sept. 13, 1889, from the Horn Fly larva. This little parasite is 

 only about -^^ inch long, but many of the most useful parasites on 

 other insects are equally small. It is highly desirable that this para- 

 site should multiply and distribute itself over the country to such an 

 extent as to hold this European invader, the Horn Fly, in check, and 

 reduce them to comparatively harmless numbers. 



In August, 1892, Prof. J. B. Smith stated that the Horn Fly was 

 not more abundant in New Jersey than the ordinary cattle fly 

 {Stomoxys calcitrans) . It is possible that the parasites are at work 

 in that state on the Horn Fly. 



