262 JOURNAL OF ECONOMIC ENTOMOLOGY [Vgl. 7 



The lower course of the Hackensack River is bordered in many 

 places by vast cat-tail areas. In such of these as do not show a rise 

 and fall of the water and expose at no time areas of muddy bottom, 

 the salt marsh mosquito does not breed, probably because no suitable 

 place for egg deposition can be found. Cat-tail areas in which the 

 muddy bottom is exposed for considerable periods breed mosquitoes 

 in enormous numbers. The marshes along the Hackensack River 

 breed more salt marsh mosquitoes at the present time than any other 

 part of the North Jersey salt marsh. 



That section of salt marsh which lies along the lower part of Newark 

 Bay and the Arthur Kill is less shut in and therefore less difficult to 

 prevent from breeding. From the Arthur Kill southward along 

 Raritan Bay, and Shrewsbury River, the meadows are narrower 

 and more easily drained. 



The meadows of Barnegat Bay are great breeders because the tide 

 fall is small (about 12 inches) and the opportunities for the distribution 

 of "killifish" correspondingly poor. 



The marshes between the Mullica and Great Egg Harbor Rivers 

 are frequently swept by tides and only those parts of the meadow 

 that join the highland and the sand strip breed. 



The marshes of the Atlantic coast from the Tuckahoe River to 

 the end of Cape May are like the preceding. 



Much of the marsh of the bay shore is shut in behind a low sand 

 strip and the natural drainage greatly obstructed, causing it to breed 

 mosquitoes in enormous numbers. , 



The marshes of the valleys of the Mullica, Great Egg Harbor and 

 the Tuckahoe Rivers are broad and apparently great breeders of 

 mosquitoes. The marshes along the rivers and creeks opening into 

 Delaware Bay have experienced a considerable amount of agricultural 

 development and" breed correspondingly fewer mosquitoes. 



Mosquito control on the salt marsh was, accorchng to Doctor Smith, 

 a matter of doing away with mosquito-breeding pools and standing 

 water generally. Ditches 10 inches wide by 30 inches deep with per- 

 fectly straight, smooth sides and proper outlets are cut through 

 the meadows at distances such as will carry off the surface water. 

 If the pools are not drained by this means they are tapped by spurs. 

 Small pools are usually filled with sods taken from the ditches, and 

 in a few years become smooth meadow. Occasionally areas of meadows 

 are found so located that ordinary ditching is impracticable. In 

 such cases the meadow is, trenched with ditches as described and 

 perhaps if the trenches cannot contain all the water an artificial lake 

 is cut in the lowest part. Trenches and artificial pool are connected 

 and the system stocked with "killifish " which are usually able to main- 



