[37 



1913, and in Camden in 1914. At this point the writer wishes 

 to acknowledge the aid rendered in starting' the work in Bergen 

 by Essex, Hudson and Passaic. It now seems likely that Cape 

 May will start in 191 6. . 



In the course of this work it has developed that there exists 

 so wide a difference between the problem of mosquito control 

 in counties within easy reach of salt-marsh mosquito flights and 

 m those out of its range, that while county-wide effort wins 

 support and encouragement in the former it meets strong opposi- 

 tion and discouragement in the latter. The writer has been forced 

 to conclude that the mosquito problem, in county-wide areas 

 beyond the range of the salt-marsh mosquito is not sufficiently 

 severe and general to render county-wide work of the character 

 of that carried on in the coastal counties practicable. Perhaps 

 further education of the public will render it so but the local 

 character assumed by the mosquito pest in such areas does not 

 lend much support to that view. 



The next problem which engaged the writer's attention was 

 one of adult mosquito distribution and its investigation quickly 

 brought out a whole series of problems intimately connected with 

 the success of the practical work. 



Early in July, 191 3, Mr. Dobbins called the writer by telephone 

 and informed him that a brood of A. cantatar had appeared in 

 Essex County, particularly in the eastern and northern sections, 

 strongly intimating that they come from, extra territorial 

 sources. It seemed obvious from Dr. Smith's records that it 

 should be perfectly possible to trace the origin of a salt-marsh 

 brood where the work began in time. Accordingly, it was sug- 

 gested by the writer that Mr. Dobbins and he undertake by use 

 of an automobile to trace this particular brood. The process 

 used was simple. Starting at a given point collections were made 

 at intervals of a mile or less, running north until mosquitoes 

 could no longer be found. Similarly collection lines were run 

 south, west and east. It was assumed the direction which ex- 

 hibited decided increase in density pointed toward the source. 

 The density was determined by collecting in as nearly similar 



