MOSQUITOES 



251 



ties of water if they have it for a few days, and especially 

 those that are more common about towns depend on small 

 pools, tanks, and rain barrels rather than larger bodies of 

 water. More breed in small pools than large, because there 

 are usually no fishes in the small pools. They fly for a few 

 rods ])ut for no extreme distance — one-half mile or a mile. 



Fig. 195. — Culex taniorhynchus: female showing the short palpi which 

 distinguish Culex from Anopheles; toothed front tarsal claw at right — 

 enlarged. (From Howard, Div. Ent., U. S. Dept. Ag.) 



They may be transported, but most annoyance comes from 

 those bred close at hand. The connection between mosqui- 

 toes and malaria has been fully established. The parasite 

 seems to be dependent upon two distinct hosts. Unless 

 there is a case of malaria in the near vicinity they cannot 

 communicate it to another. The relation of mosquitoes to 

 yellow fever has also been worked out very carefully. One 



