GROWTH AND TRANSFORMATION 185 



imago we noticed (pp. 177-8) that there is a type of larva 

 with cuticle predominantly firm so that the body is well 

 armoured and provided with relatively long feelers and legs. 

 When such a larva is slender in build and furnished with a 



Fig. 52.— a, Nymph of Mayfly {Chloeopsis dipterd) , w, wing rudi- 

 ments ; g, abdominal gills . X 8 . After Vayssiere and Eaton . B , Bristle- 

 tail (Petrobius maritimus) y female (ventral view), a5, abdominal stylets ; 

 0^, ovipositor, x 5. In part after J. T. Oudemans. 



pair of tail appendages (cerci), as in the familiar mayfly 

 nymph (Fig. 52, A), it presents, as F. Brauer (1869) pointed 

 out, rather strong likeness to a bristle-tail (Thysanuran) 

 such as a Machihd (Fig. 52, B) or Campodea, hence it is 



