Fig. 20. 8th and 9th segment of Culex sp. for comparison with those of Mansonia. 
Unvariably sinks to the bottom over which it serpentizes in its 
idle and sluggish mannér, until it has got hold of a plant. 
At the first moment we are unable to understand what may 
be the use of the large tail. As we know that the tail of the 
Sabetini from the water-spaces in the leaves of Bromeliaceæ und- 
