The Mosquitoes of New Jersey 



215 



of draining and filling completed and, as nearly as possible, all residual breed- 

 ing destroyed. 



Perhaps the quickest and surest way to set forth the facts regarding the 

 progress in control of salt-marsh mosquitoes is to examine the map of New 

 Jersey (fig. 128). The bordering salt marshes of the ocean and bay coasts 

 are either completely black or cross-barred with black. The former repre- 

 sents Ontouched salt marsh and the latter the more or less completely drained 

 portions. The original area of upland formerly covered by flights of the 

 salt-marsh mosquitoes is outlined by the dotted lines. That portion of this 

 area which is still infested is shown by dot-shading and the depth of the 

 shading is intended to correspond to the density of infestation. 



The occurrence of infested areas in the region of the salt marsh which is 

 marked drained, is due to incompleteness of the drainage systems established. 

 Anything like complete control throughout this large area involves the in- 

 stallation of more complete drainage systems than now exist in more than a 

 very few places. For the purpose of showing the stage of completeness in the 

 drainage systems, the following table of estimates prepared about October 31, 

 1919, is presented : 



Table 3 

 Status of Salt-Marsh Drainage, October 31, 1919 



County 



Acreage of 

 tidal marsh 



Estimated percent- 

 age of the marsh 

 that is drained or 

 does not need 

 drainage 



Hudson . . 

 Bergen . . . 

 Essex 



Union .... 

 Middlesex 

 Monmouth 

 Ocean .... 

 Burlington 

 Atlantic •. . . 

 Cape May 

 Cumberland 

 Salem .... 



acres 



11,486 



8,378 



4,631 



4,413 



8,199 



3,378 



40,400 



9.943 



53,325 



53.638 



52,661 



31.780 



per cent 

 64 

 70 

 100 

 93 

 56 

 97 

 71 



65 

 39 



4 



In Bergen, the lower end of Ocean, Atlantic and Cape May, in certain lim- 

 ited areas in other counties, the ground which was covered was sufficiently 

 drained and the percentage marked as undrained represents areas that are 

 practically untouched. In the other counties, however, with the limited areas 

 excepted, the shortage is due to lack of completeness within areas already 

 covered by drainage systems. 



The progress in salt-marsh ditching from the beginning is given in table 4. 



