bathrooms ; and old pits and wells. They may occur also 

 in ditches, even in ditches which contain slowly running 

 water. 



For practical purposes it is always most important to 

 remember that when a large number of Culex exist in a 

 given house, they are, in the large majority of cases, being 

 bred just outside the windows. Thus we often find more 

 Culex mosquitoes in one room than in another ; and in 

 such cases their larvae can generally be discovered in a 

 water-butt or flower-pot under the window of the infested 

 room. A few insects may come from the backyards of our 

 next-door neighbours, and still fewer from a little further 

 away ; but as a rule the Culex mosquito is a home-bred 

 article. It is generally easy to prove this by destroying 

 our own larvae ; after which a marked diminution of the 

 winged insects in the house is almost certain to occur, even 

 within twenty-four hours or so. And we must remember 

 that it is these insects which carry yellow fever, elephantia- 

 sis, and perhaps other diseases, besides causing intense 

 annoyance by night and day. 



To those who really know about mosquitoes, it is always 

 somewhat amusing to hear less well-instructed people 

 complaining of the number of these pests which surround 

 them, and which they often imagine are blown across seas 

 and rivers by tornadoes, or are bred in countless myriads 

 in neighbouring forests and marshes the truth generally 

 being that they are bred in their own backyards ! 



5. Breeding Places of Anopheles. The habits of 

 Anopheles, the malaria-bearing variety of mosquito, are 

 somewhat different. These insects breed mostly, not in 

 vessels of water, but in puddles on the ground. But they 



