STRUCTURE OF PUP^. 



305 



the tail, which appear to be breathing-tubes, of the 

 nature of gills ; for the larva lies under water in 

 streams and ditches, enclosed for the most part in a 

 tube of earth. It is of a fine crimson colour, the 

 origin of its popular name ; but it becomes more 

 dark and opaque in the pupa state. 



n, Chmmomus plumnsua. h, larva of the s;»me, called the 

 hliiod worm, c, d, \n\y.3a of the same, maguified to show theiv 

 plumed spiracles. 



