Flight and Attraction of Mosquitoes 95 



flight of Anopheles in a northerly direction, or 

 against the wind, and this was reported by Le 

 Prince at the International Congress of Hygiene, 

 1912. 



Anopheles propagation areas occur near Ancon 

 and the city of Panama, and the wind blows from 

 those places toward the houses: if the flight of 

 Anopheles was assisted by gentle winds the houses 

 should contain many.' As a matter of fact, 

 there are few at Ancon as compared with other 

 settlements, and the production area there has been 

 under observation for nine years. 



Panama touches the Pacific Ocean. Beginning 

 at the base of the hill on which Ancon, its suburb, 

 is located, a swampy area extends for about two 

 miles northwards, and the village of Corozal is 

 three miles north of Panama. Three miles north 

 of Corozal is the village of Miraflores, and a 

 prolific Anopheles-hreeding area lies between the 

 two villages, extending over the larger part of 

 the intervening distance. The southern end of this 

 area is nearer Corozal than any part of the Ancon- 

 Corozal swamp. 



In 191 1, work was concentrated on the southern 

 portion of the Corozal-Miraflores swamp, in order 

 to reduce the Anopheles arriving at Corozal. The 



" See map opposite p. 95. 



