﻿EXPLANATION 
  OF 
  PLATE 
  XXIII. 
  

  

  Larva 
  of 
  Orthopodomyia 
  arboricollis, 
  d'Emm. 
  

  

  Fig. 
  1 
  . 
  End 
  of 
  abdomen 
  in 
  fourth 
  instar. 
  

  

  2. 
  Head, 
  showing 
  extreme 
  of 
  variation, 
  with 
  dense 
  plumes 
  and 
  long 
  curved 
  

   antennae. 
  

   ,, 
  3. 
  Head, 
  showing 
  opposite 
  extreme 
  of 
  variation, 
  with 
  weakly 
  developed 
  plumes 
  

  

  and 
  short, 
  straight 
  antennae. 
  

   ,, 
  4. 
  Larva 
  in 
  fourth 
  instar, 
  showing 
  complete 
  development 
  of 
  the 
  chitinous 
  

   plates 
  and 
  head 
  plumes. 
  

  

  