OF WASHINGTON, VOLUME XI, 1909. 145 



A REPORT ON MOSQUITOES AT DUBLIN, NEW HAMP- 

 SHIRE, PARTICULARLY ON THE OCCURRENCE OF 

 MANSONIA PERTURBANS WALKER. 



[Diptera, Culicidae.] 

 BY HARRISON G. DYAR. 



The town of Dublin, New Hampshire, is a small collection of 

 houses in the hilly country near the base of Mount Monadnock, 

 to the east. The adjacent land was in use for farming pur- 

 poses half a century ago, but has lately been allowed to grow up 

 to a second growth of deciduous trees and conifers. Alost of 

 the farms are now occupied as summer places by people resi- 

 dent in the larger cities, Boston, Baltimore, Chicago, etc. The 

 places are consequently not used for farming, but are covered 

 with young forest close up to the houses, which are situated re- 

 motely from each other. In the valleys between the hills run 

 small streams, none of any size, but at numerous points are 

 situated small to rather large lakes. The climate is cool, the 

 fauna sub-boreal, The altitude of Monadnock Lake, the larg- 

 est lake in the region described, is 1500 feet. 



Considerable trouble has been experienced by the summer 

 residents with mosquitoes. These people, coming to the region 

 solely for summer vacation, are not disposed to put up with 

 the annoyance of these insects, but in many cases would seek 

 some other place. As the town of Dublin, in common with 

 many other places in New England, depends largely for its 

 prosperity on its popularity with the summer visitors, the mos- 

 quitoes prove a serious economic problem. There is here no 

 question of danger to health from diseases transmitted through 

 their bites. The locality is far out of the range of tropical 

 disease carriers, and though two species of Anopheles are 

 present, and not uncommon in suitable places, they are not 

 generally diffused enough, nor even sufficiently locally abundant 

 to constitute a serious menace. It is probable that under 

 special conditions malaria could be acquired in Dublin; but in 

 the houses occupied by the summer residents I think there is 

 no danger whatever. The question then resolves itself into a 

 study of the annoying species, particularly those prone to enter 



houses. 



I'nder these conditions we naturally look first to the house 

 mosquito, Culc.v pif>icns Linn., and allies. Cnlc.r pipicns does 

 not occur in the region. It is an imported European species, 

 frequenting the larger centers of civilization, and in my exper- 

 ience has nowhere penetrated into the country. The only 



