﻿336 
  

  

  JAMES 
  WATERSTON. 
  

   Proportions 
  of 
  Tarsal 
  Joints. 
  

  

  1 
  

  

  1 
  

  

  ii. 
  

  

  iii. 
  

  

  iv. 
  

  

  Fore 
  

  

  15 
  

  

  20 
  

  

  20 
  

  

  40 
  

  

  Mid 
  

  

  20 
  

  

  28 
  

  

  24 
  

  

  36 
  

  

  Hind 
  

  

  20 
  

  

  30 
  

  

  20 
  

  

  40 
  

  

  Abdomen 
  with 
  all 
  segments 
  subequal 
  ; 
  2 
  and 
  3 
  shorter, 
  4 
  to 
  7 
  a 
  little 
  longer. 
  

   The 
  middle 
  of 
  the 
  dorsum 
  smooth, 
  while 
  the 
  tergites 
  are 
  reticulate 
  on 
  the 
  overlapping 
  

   flaps. 
  Spiracle 
  small 
  and 
  round. 
  The 
  eighth 
  tergite 
  is 
  very 
  bristly 
  ; 
  the 
  stylet 
  short, 
  

   conical, 
  with 
  five 
  bristles 
  (one 
  long). 
  Free 
  portion 
  of 
  sheath, 
  which 
  is 
  broad, 
  oval, 
  

   pointed, 
  with 
  about 
  20 
  shorter 
  bristles, 
  one-fifth 
  of 
  the 
  base. 
  The 
  saw 
  is 
  pale, 
  with 
  

   a 
  black 
  apex 
  and 
  seven 
  distinct 
  teeth 
  ; 
  three 
  are 
  at 
  the 
  apex, 
  then 
  after 
  a 
  deep 
  notch 
  

   follow 
  three 
  more, 
  with 
  a 
  seventh, 
  rather 
  fainter. 
  

  

  Length, 
  over 
  1£ 
  mm. 
  ; 
  alar 
  expanse, 
  about 
  3 
  mm. 
  

  

  Host 
  : 
  a 
  microlepidopterous 
  leaf-miner 
  (Acrocercops 
  ordinatella, 
  Meyr.) 
  of 
  the 
  

   camphor 
  plant. 
  

  

  Described 
  from 
  1 
  <£ 
  and 
  4 
  $ 
  £. 
  

  

  Holotype 
  — 
  a 
  $ 
  

  

  Genus 
  Syntomosphyrum, 
  Forster. 
  

  

  Perhaps 
  the 
  most 
  interesting 
  of 
  Mr. 
  Kutherford's 
  captures 
  is 
  a 
  Tetrastichine 
  

   species 
  represented 
  by 
  three 
  $ 
  $ 
  assignable 
  apparently 
  to 
  the 
  above 
  genus. 
  All 
  

   three 
  examples 
  were 
  bred 
  from 
  a 
  Coccinellid 
  pupa, 
  two 
  being 
  robust 
  and 
  of 
  equal 
  

   size, 
  while 
  the 
  third 
  is 
  considerably 
  smaller. 
  

  

  I 
  have 
  elsewhere 
  (p. 
  364) 
  given 
  my 
  reasons 
  for 
  restricting 
  the 
  name 
  Syntomo- 
  

   sphyrum 
  to 
  Tetrastichines 
  with 
  an 
  unlined 
  mid 
  lobe 
  on 
  the 
  mesothorax, 
  while 
  the 
  

   scutellum 
  is 
  furrowed 
  only 
  between 
  the 
  dorsal 
  and 
  lateral 
  aspects. 
  In 
  the 
  present 
  

   case 
  the 
  apex 
  of 
  the 
  mid 
  lobe 
  shews 
  a 
  minute 
  median 
  excision 
  at 
  the 
  suture, 
  the 
  

   mid 
  line 
  of 
  the 
  lobe 
  being, 
  if 
  anything, 
  paler, 
  and 
  apparently 
  a 
  little 
  depressed 
  

   posteriorly, 
  though 
  no 
  real 
  impressed 
  line 
  or 
  furrow 
  can 
  be 
  traced. 
  After 
  potash, 
  the 
  

   scutellum 
  exhibits 
  two 
  extremely 
  fine 
  and 
  incomplete 
  parallel 
  longitudinal 
  lines 
  

   inside 
  the 
  lateral 
  sulci. 
  In 
  thoracic 
  characters, 
  then, 
  S. 
  taprobanes 
  occupies 
  a 
  trans- 
  

   itional 
  position 
  between 
  Syntomosphyrum, 
  Tetrastichodes 
  and 
  Tetrastichus. 
  The 
  

   concomitant 
  antennal 
  characters 
  are 
  also 
  somewhat 
  variable, 
  e.g., 
  the 
  ring 
  joints 
  

   and 
  the 
  number 
  of 
  funicular 
  joints. 
  Therefore 
  without 
  questioning 
  their 
  practical 
  

   utility, 
  I 
  think 
  it 
  likely 
  that 
  the 
  above 
  genera 
  constitute 
  a 
  graded 
  series 
  with 
  no 
  very- 
  

   natural 
  division. 
  I 
  have 
  placed 
  the 
  Ceylon 
  ese 
  form 
  in 
  Syntomosphyrum 
  mainly 
  

   because 
  of 
  its 
  evident 
  affinity 
  with 
  the 
  species 
  Silvestri 
  has 
  described 
  under 
  the 
  name 
  

   S. 
  indicum 
  (Boll. 
  Lab. 
  Zool. 
  Agr. 
  Portici, 
  iv, 
  p. 
  232-344, 
  fig. 
  iii-viii, 
  1910). 
  The 
  

   two 
  indeed 
  come 
  close, 
  but 
  there 
  are 
  minute 
  differences 
  all 
  over, 
  which 
  induce 
  me 
  to 
  

   treat 
  them 
  separately 
  at 
  present. 
  Of 
  these 
  differences, 
  some 
  of 
  which 
  are 
  tabulated 
  

   below, 
  the 
  most 
  easily 
  recognised 
  lie 
  in 
  the 
  antennae 
  and 
  hind 
  tarsi. 
  The 
  species 
  

  

  