The Mosquitoes of New Jersey 



91. 



Evaluating the Effect of the Work in Terms of Density of Mosqui- 

 toes on the Wing 



Some method of estimating the results^ in terms of mosquitoes 

 found must be devised, and it is probable that regular weekly or 

 semi-weekly night collections will serve the purpose. Depending 

 upon the citizens' reports is very unsatisfactory, because they are us- 

 ually widely divergent and in many cases diametrically opposed. 

 The method of making and interpreting night collections is set forth 

 in the following statements. 



Fig. 54. An unusual breeding place of the house mosquito ; sewage beds 



when water-logged become prolific breeders of mosquitoes. (Photo by 



Monmouth County Mosquito Extermination Commission). 



There is no occasion to begin making evening collections until the 

 breeding conditions indicate that mosquitoes are beginning to get on 

 the wing or some adults are discovered incidentally. In the spring 

 when we have the salt-marsh, the woodland-pool, and the fresh- 

 water swamp species to deal with, daylight collections will be satis- 

 factory, provided they are made in the same manner, at the same 

 time and in similar (preferably weedy or shrubby) places. When, 

 however, as in early summer the house mosquitoes must be taken in- 



