The Mosquitoes of New Jersey 229 



work should not exceed ^ of a cent per foot, which would make the 

 •cost about $62,000.00 annnually. To this must be added the cost 

 of blockage removal for the rest of these systems, which experience 

 has shown to amount to about $800.00 per million feet, which would 

 amount to $48,800.00 annually. Thus the annual cost of keeping 

 the ditching systems in repair should amount to about $110,800.00, 

 or about 37.4 cents per acre. 



Of course, when dealing with salt marshes in close proximity to 

 average populations a higher degree of protection will be demanded, 

 and the cost of maintenance will be much higher. 



References 



(i) Howard, L. O., Dyar, H. G., and Knab, F. 1912. The Mosquitoes of 

 North and Central America and the West Indies, 3 vol., Carnegie 

 Inst. Wash., Washington, D. C. 



(2) Le Prince, J. A., and Orenstein, A. J. 1916. Mosquito Control in 



Pamana. Putnam, New York. 



(3) New Jersey Mosquito Extermination Association, Proceedings of the 



Annual Meetings for 1914 to 1919. 



(4) Smith, John B. 1904. Report of the New Jersey Agricultural Experi- 



ment Station upon the Mosquitoes occurring within the State, Their 

 Habits, Life History, etc. New Brunswick, N. J. 



(5) Smith, John B. 1909. Report of the Insects of New Jersey. In Ann. 



Rpt. N. J. State Museum (1909). 



(6) Theobald, F. V. 1901. A Monograph of the Culicidae of the World. 



Brit. Mus. Nat. Hist., London. 



