354 JOURNAL OF ECONOMIC ENTOMOLOGY ' [Vol. 9 



6. HixDLE, E. (1914). "The Flight of the House-Fly." Proc. Cambridge Phil. 



Soc, vol. XVII, pt. 4, pp. 310-313. 



7. Zetek, J. (1914). "Dispersal of Musca domesiica Linn." Ann. Ent. Soc. Am., 



vol. VII, No. 1, pp. 70-72. 



8. Parker, R. R. (1914). See "First Biennial Report," Montana State Board of 



Entomology, pp. 39 and 40. 



9. MuNSON, E. (1901). "The Theory and Practice of Medical Hygiene." 



10. Cox, G. L., Lewis, F. C. and Glynn, E. E. (1912). "The Numbers and Varie- 



ties of Bacteria carried by the Common House-Fly in Sanitary and Insanitary 

 City Areas." Journ. of Hygiene, vol. XII, pp. 290-319. 



11. Hutchinson, R. H. (1915). "A Maggot Trap in Practical Use, An Experiment 



in House-Fly Control." U. S.'D. A., Bur. of Entomology, Bulletin 200. 



Explanation of Plates 24 — 26 



Fig. 1. Showing approximate location of Sales Yards release point (x). Miles 



City beyond trees in background. 

 Looking toward Miles City from Sales Yards release point. 

 Looking toward ^I'Aes City from vicinity of release point on prairie one 



mile west of city. 

 City Park which is between the river bed of Figure 2 and Miles City. 

 Character of the country between Laboratory and State Industrial 



School (x). 

 Release point — City Dump. 

 Part of the Miles City horse sales yards. 

 Privy (x) and manure pile (o) near Station 216. 

 Privy with open vault near door to Station 216. 

 Laboratory (x) and city in background. 

 Trap used at Sales Yards (Station 168). 



SOME OBSERVATIONS ON THE BREEDING HABITS OF THE 

 COMMON HOUSE-FLY (MUSCA DOMESTICA LINN.S:US) 



By Arthur T. Evans 



During the past summer a number of experiments were conducted 

 by the writer relative to the breeding habits of the common house-fly, 

 Musca domestica. It is a somewhat popular belief that the house-fly 

 is able to and does breed abundantly in garbage, manure and any other 

 rubbish which may be accessible. As definite records on the breeding 

 places of this fly were somewhat limited it was decided that a thorough 

 search should be made of numbers of garbage cans, manure piles and 

 any rubbish heaps that were found available to see if the larvae could 

 actually be found in these various conditions. The garbage cans 

 examined contained many kinds of garbage in various stages of decay. 

 With a single exception no larvse of the house-fly were found in the 

 cans examined. The larvse as well as the adults of the small fruit-fly, 

 Drosophila sp., appeared abundant in almost every can examined. 

 Upon opening a garbage pail the adults of this insect usually fly out 

 in numbers. It may be due to this fact that it is so generally believed 



