against the eggs and larvae of the insects, for the destruction of these 

 materially assist in reducing the number of mosquitoes. To accomplish 

 effective results, a general map should be prepared, on which the principal 

 breeding places and places infested with mosquitoes should be clearly 

 shown, such as old mill ponds, swamps, all large water pools, sluggish 

 streams, and salt-marsh areas. Once this map is available, a comprehensive 

 plan of campaign can be laid out. 



The cooperative work recommended comprises the drainage of marshes 

 by ditching and connections with some nearby water channels ; the drain- 

 age of unhealthy swamps, the improvement of gutters on public roadsides 

 and the filling in of all low places and of unsightly and unwholesome 

 puddles of water. The work should also extend to looking after cesspools 

 and rain-water cisterns, and any sewer catchbasins, as well as public road- 

 side watering troughs or fountains should not be forgotten. In many 

 cases the application of kerosene or phinotas oil will bring some improve- 

 ment. The guiding principle should be to do whatever is done in a 

 thorough manner. The active work might profitably be supplemented with 

 instructive lectures on the subject, and with the distribution of pamphlets 

 and circulars like the "Mosquito Brief," issued some years ago by the 

 American Mosquito Extermination Society. 



BIBLIOGRAPHY. 



A partial Bibliography on "Flies and Mosquitoes as Carriers of Dis- 

 ease," compiled by the author, may be found in the February and May, 

 1909, numbers of the Entomological News of Philadelphia, Pa. 





