The Mosquitoes of New Jersey 



105 



seasonal variation. Starting with a spell of very wet weather in 1916 

 it became the dominant species in all counties with non-sandy soil 

 where mosquito-control work was going on and remained so 

 throughout 1917. In 1918 it returned to its former status as a mam 

 constituent of the mosquito fauna but in 1919 it seemed in the way 

 of resuming the prominent position which it held in 1916 and 1917. 

 The cause of this variation is unknown. 



Fig. 64. 



Adult of the Swamp Mosquito. (After John B. Smith). 



I, female adult; 2, anterior; 3, middle and 4, posterior claws of the male 



(all much enlarged). 



In 191 7 it bred during the month of June in enormous numbers 

 over the flooded areas of the upper Passaic Valley, and on emerging 

 made its way eastward and south-eastward through the gaps of the 

 movmtains in some cases for a distance of 10 miles. 



