﻿164 
  

  

  BRUCE 
  F. 
  CUMMINGS. 
  

  

  to 
  be 
  inserted 
  into 
  the 
  rounded 
  anterior 
  corner, 
  just 
  above 
  the 
  angle 
  made 
  by 
  the 
  

   transverse 
  band 
  where 
  it 
  enters 
  the 
  longitudinal 
  band 
  on 
  each 
  side. 
  The.upperendof 
  

   each 
  clavicle 
  is 
  a 
  little 
  swollen 
  and 
  shows 
  as 
  a 
  minute 
  colourless 
  circle 
  upon 
  the 
  dorsal 
  

   integument, 
  suggesting 
  that 
  this 
  may 
  be 
  an 
  atrophied 
  spiracle 
  and 
  the 
  clavicle 
  itself 
  

   a 
  tracheal 
  tube 
  metamorphosed 
  into 
  a 
  chitinous 
  support. 
  Legs 
  : 
  First 
  pair 
  : 
  the 
  

   coxae 
  lie 
  longitudinally 
  and 
  are 
  in 
  shape 
  something 
  like 
  a 
  propeller-blade 
  ; 
  posterior 
  

   margin 
  of 
  the 
  femur 
  very 
  convex. 
  Second 
  pair 
  : 
  coxa 
  in 
  the 
  form 
  of 
  a 
  truncated 
  

   cone 
  ; 
  femur 
  less 
  powerful. 
  In 
  all 
  three 
  pairs 
  of 
  legs 
  at 
  the 
  distal 
  extremity 
  of 
  the 
  

  

  8 
  

  

  Fig. 
  4. 
  Colpocephalum\'mj6bergi, 
  sp. 
  nov., 
  <$. 
  

  

  (a) 
  Mandibles. 
  — 
  {b) 
  Mouth 
  -parts, 
  with 
  the 
  mandibles 
  removed: 
  BP, 
  basal 
  piece; 
  CC, 
  

   chitinous 
  chords; 
  Mx.L, 
  maxillary 
  lobe; 
  OS, 
  oesophageal 
  sclerite; 
  P, 
  labial 
  palpus; 
  

   PI., 
  fringed 
  plate; 
  T, 
  tentorium 
  ; 
  TB, 
  transverse 
  bar, 
  with 
  muscle 
  strands 
  attached. 
  

  

  tarsus, 
  projecting 
  between 
  the 
  two 
  claws, 
  in 
  the 
  position 
  usually 
  occupied 
  by 
  the 
  

   pulvillus 
  in 
  Diptera, 
  are 
  two 
  minute 
  delicate 
  organs 
  (fig.5, 
  Pv.). 
  Only 
  one 
  on 
  each 
  tarsus 
  

   is 
  shown 
  in 
  the 
  illustration. 
  These 
  small 
  pulvillus-like 
  structures 
  occur 
  in 
  Menopon 
  

   and 
  other 
  genera 
  and 
  are 
  perhaps 
  of 
  general 
  occurrence 
  in 
  the 
  Mallophaga. 
  Kellogg 
  

   and 
  Nakayama 
  (9) 
  have 
  recently 
  described 
  them 
  in 
  their 
  new 
  genus 
  Philandesia. 
  

   If 
  they 
  really 
  prove 
  to 
  be 
  homologous 
  with 
  the 
  pulvillus, 
  the 
  Mallophagan 
  onychium 
  

   must 
  be 
  something 
  sui 
  generis. 
  Abdomen 
  : 
  The 
  figure 
  (fig. 
  4) 
  gives 
  an 
  excellent 
  

   idea 
  of 
  the 
  shape. 
  

  

  