THE LIFE CYCLE 



349 



in, 



o 



FIG. 201. Metamorphosis in the iris weevil (Mononychus vulpeculus) m, the 

 larva at the beginning of transformation; /, leg buds and w, wing buds, 

 showing through the' translucent skin. 



n, longitudinal section of a leg bud of the larva, showing three principal 

 divisions: /, the remains of fat cells; /, leucocytes. 



o, vertical section through the wing bud of the larva; w, the point of the wing 

 that is to be, with a shelf of epidermis projecting below it; c, the loosened 

 cuticle; /. fat; m, muscle; t, air tube (trachea). 



a, Cross section of a larva just before its final transformation to a pupa: 

 w, wing and /, leg are now exserted, and the latter .shows differentiation into 

 femur, tibia and tarsus; k, stomach; e, digestive epithelium; n, doublenerve 

 cord; dv, dorsal blood vessel; /, whole fat and o, o, o, dissolving fat; m, new 

 muscle fibres forming. 



