MOSQUITOES IK GENERAL 25 



cases need an individual or a community be deterred 

 even for a moment from attempting remedial work 

 against mosqnitoes by the idea that the mosquito supply 

 is likely frequently to be renewed by flights from long 

 distances or even from distances of much more than a 

 single mile. A far more serious source of re-establish- 

 ment of the mosquito supply will be considered in the 

 following section. 



Carriage of Mc^squitoes by Eailway Trains and other 

 Conveyances. 



That mosquitoes are carried by railway trains must be 

 a matter of common observation to everyone who traAxls. 

 That this method of distribution is and has been a very 

 important one, has, however, been rather generally over- 

 looked. It is said that mosquitoes were unknown in 

 Hawaii until brought over in sailing vessels from the 

 United States. On these sailing vessels they had proba- 

 bly bred more or less continuously in the water-liarrels, 

 and when once introduced into the islands they bred with 

 great facility in the swamps and freshwater ponds, and 

 to-day these insects are said to be very abundant there. 



Beyond the statement which occurs in Nuttall's mono- 

 graph (1899), where the probable influence of winds, rail- 

 ways, and ships in the dissemination of mos(piitoes is 

 briefly mentioned, the subject had received ]U'aeti('ally no 

 consideration until it was l)rought out in the bulletin en- 

 titled, " Notes on Mosquitoes," prepared by the author 

 and published by the United States Department of Agri- 



