February, '16] ENTOMOLOGISTS' DISCUSSIONS 147 



President Glenn W. Herrick: The next paper on the program 

 is by R. R. Parker of Montana. As the author is not present the paper 

 will be read by J. R. Parker. 



DISPERSAL OF MUSCA DOMESTICA LINN^US UNDER 

 CITY CONDITIONS 



By Ralph R. Parker, Bozenian, Mont. 

 (Not received in time for publication in this issue) 



President Glenn W. Herrick: Is there any remark or discus- 

 sion? 



Mr. Max Kislink, Jr. : I have been working on dispersion of the 

 house-fly for the Bureau of Entomology. At the Animal Industry 

 Farm at Bethesda, Md., we liberated from the 30th of June to Septem- 

 ber 10, 200 colored flies. All were liberated from about the same point 

 on this farm. We bred these in cages from a lot of maggots taken from 

 pig manure. 



The method of coloring was with colored chalk and marking freshly 

 emerged flies, not more than a day old. First we put traps within 500 

 yards from the point we liberated the flies and caught a good many in 

 that way. Then we increased the distance. We also made rounds 

 among the residents and whenever they saw a colored fly they would 

 swat it. Some people who were not notified of it thought the flies 

 were carriers of a certain kind of spotted fever. The results of the 

 summer showed that the flight spread out over an area of one and a 

 quarter miles. In the experiment I noted that the flies did not go in 

 any particular direction with the wind. In fact I have often noticed 

 the flies going against the wind. 



President Glenn W. Herrick: Did you put the chalk on their 

 wings or on their bodies? 



Mr. Max Kislink, Jr. : As soon as the flies emerged we let them 

 out of the breeding cages into a trap. Then we put the flies into paper 

 bags heavily chalked, shook them up and when they were let loose 

 there was quite a cloud of color. 



President Glenn W. Herrick: For the past three years I have 

 been spending a part of the summer on Cranberrj' Lake in the Adiron- 

 dacks, one and one-eighth miles from the village of Cranberry Lake. 

 There are no animals on that side of the lake but toward the latter 

 part of the summer we are troubled with house-flies. There are no 

 breeding places for them and they must come from the village one and 

 one-eighth miles across the lake in a diagonal direction. I see no 



