110 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 6 



In nature 300 bites are impossible as are 200, 100, or even 50. Twenty 

 seem improbable to me, while any number up to 10 is quite possible. 

 Stomoxj'S seems very fond of feeding around the ankles, and I have 

 seen two feeding on a child who was so intent on something or other 

 that he did not notice the flies at all. In the case of heart-water, a 

 disease of sheep, goats and cattle, which resembles Pohomyelitis in 

 many ways, it has been found that one can be reasonably sure of 

 getting the disease from the bites of three infected- ticks. If such 

 could be shown to be the case with Stomoxys in Infantile Paralysis,, 

 I think it would be a very important addition to the knowledge of 

 the subject. 



Mr. C. T. Brues : Just a word in regard to the fact that it actually 

 takes a large amount of blood to transfer the disease from one animal 

 to another by inoculation in this way. I do not think that a large 

 number of flies would be necessary to transfer it in this way, much 

 less that a single bite would produce disease in a merely mechanical 

 way. I very much doubt if any of these monkeys could have been 

 bitten by many infected flies. 



Mr. Brain : In connection with the inference that there is a cycle, 

 part of which occurs in the body of the fly, from the fact that it requires, 

 a large amount of blood to cause the disease, it seems to me that I 

 have heard of a similar case where a very small, or a very large amount, 

 of blood was necessary. I do not think the case is quite understood. 

 That there is anything like a ten days' incubation period in the body 

 of the fly seems to be disproved by the experiments of Anderson and 

 Frost, for they inoculated the first monkey with the virus on October 

 3d, and the second on October 5th. Fhes were fed a few hours after 

 inoculation, and by October 13th they had two monkeys down from 

 the inoculation and two from fly transmission. 



Mr. E. p. Felt: We have with us Dr. C. F. Hodge of Clark 

 University, Worcester, Mass., who has developed a very successful 

 flytrap and I think it would be very interesting if we could hear from 

 him at this time. 



President W. D. Hunter: If there is no objection we will allow 

 Dr. Hodge five minutes in which to discuss his flytrap. 



A NEW FLY TRAP 



By C. F. Hodge, Clark University, Worcester, Mass. 



In our present war on the flies the quick, easy and effective method 

 is to catch the breeders, or let them catch themselves. One pair put 

 out of business in the spring may mean bushels less through the summer 

 and fall. 



