STRUCTURE OP PUPiE. 



305 



nature of gills ; for the larva lives 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 opaqiiein the pupa 

 state. 



The appendages which are thrown off by the larva 



a, Chirononms p/iimosus. b, larva of tlie same, called the b/ood worm, 

 d, pupae of the same, magnified to sliow their plumed spiracles. 



VOL. VI. 26* 



