140 



DIPTERA OF MINNESOTA. 



L___ 



Fig. 139. Dead House Fly with niitcs 

 attached. Lugger. 



I'ig. 1-10. House I'ly killed by fungus 

 disease. Lugger. 



means taken to destroy or cover with earth or ashes fsecal matter as 

 soon as deposited. A large number of Diptera breed in human excre- 

 ment. Dr. Howard says that out of seventy-seven species of Diptera 



Fig. 141. Details of fungus which kills house flies, as seen under the microscope. A. fly 

 on pane of glass, surrounded by characteristic halo; B, C, D, E, and F. different 

 stages in the growth of the fungus. The fractions by each capital letter show 

 the amount of enlargment of each figure. After Brefeld. 



