Household Pests and Their Treatment. 



67 



partly in the pupa stage. Flies which have passed the winter 

 hidden away about dwellings place eggs in manure in May, and 

 a succession of generations develops during the summer months. 

 These simple facts are very well known to many people now, 



FIG. 1. The common house-fly 

 (Musca domestica) adult. Orig- 

 inal 



FIG. 2. The common house-fly 

 A, pupa; B, larva. After How- 

 ard. 



FIG. 3. The stable-fly (Stomoxys calcitrans). A stinging species some- 

 times entering houses. Adult. Original. 



and explain why boards of health insist on frequent cleansing 

 and disinfecting of stables about cities. This is, in fact, the 

 most important precaution to be taken in dealing with the 



