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on the night upon which they appear, but may 

 have come on board when the ship was in port or 

 even have been bred on board. In certain villages 

 in India studied by us, Mym. culicifacies, Nyss. 

 stephensi, and Nyss. juliginosus were always present 

 in abundance, if there were extensive breeding- 

 grounds within quarter-of-a-mile. Where villages 

 were distant half- a- mile from extensive breeding- 

 grounds, they contained few or no Anophelines. The 

 only exceptions to this rule were when breeding- 

 places had only recently dried up. In the case of 

 the above species they undoubtedly fly fairly 

 readily quarter-of-a-mile, but half-a-mile appears 

 to be beyond the normal distance of flight.. 



Relation to Colour, Odour of Objects 

 Etc 



Anyone who, in the tropics, has left his ward- 

 robe open at sunrise and then closed it, and again 

 examined it some time later, will have often 

 observed the well-known fact that, on his white 

 clothes, few or no mosquitoes are resting, but that 

 on his blue serge clothes there may be dozens. 

 He will have noted, too, that outside his mosquito 

 net it is on the shady side that the mosquitoes 

 remain longest, until from here also they fly away 

 as the fierce sun rises. 



Hewillhave noted, too, that ^4. wo/; /leZ/wes aswell 

 as CuUcines have a predilection for certain smells. 

 Old boots and blacking attract them strongly, 

 and the leather of a saddle room is their favourite 

 haunt. Anophelines, too, much preferthe odoriferous 

 skin of the native to that of the European, as 

 experiments made by us in Sierra Leone clearly 

 shewed. 



