﻿Mr. 
  J. 
  W. 
  Slioebotliam's 
  Notes 
  on 
  Collemhola. 
  65 
  

  

  as 
  the 
  body, 
  filiform; 
  fork 
  developed." 
  Succeeditig' 
  authors 
  

   liave 
  accepted 
  this 
  genus, 
  and 
  most*, 
  including 
  TuUberg 
  

   (1872), 
  p. 
  42, 
  Lubbock 
  (1873), 
  p. 
  129, 
  Borner 
  (1901), 
  p. 
  63, 
  

   Carpenter 
  (1906), 
  p. 
  41, 
  and 
  Liniianiemi 
  (1912), 
  p. 
  232, 
  

   give 
  as 
  one 
  of 
  the 
  characters 
  the 
  presence 
  of 
  six 
  eyes 
  on 
  each 
  

   side 
  of 
  the 
  head. 
  I 
  have 
  examined 
  three 
  species 
  of 
  Orchesella^ 
  

   and 
  have 
  been 
  able 
  to 
  find 
  eight 
  in 
  each 
  of 
  them. 
  It 
  is 
  true 
  

   that 
  two 
  of 
  them 
  are 
  much 
  smaller 
  than 
  the 
  rest; 
  but 
  if 
  the 
  

   insects 
  are 
  treated 
  with 
  caustic 
  potash 
  and 
  examined, 
  the 
  full 
  

   number 
  will 
  be 
  observed. 
  I 
  give 
  illustrations 
  (PI. 
  IIT. 
  

   figs. 
  6-8) 
  of 
  the 
  eyes 
  in 
  the 
  three 
  species 
  I 
  have 
  had 
  the 
  

   opportunity 
  of 
  examining, 
  viz. 
  0. 
  cincta, 
  0. 
  villosa, 
  and 
  

   O. 
  Jlav-escens. 
  In 
  a 
  paper 
  on 
  Hertfordshire 
  Apterygota, 
  

   Mr. 
  Collinge 
  and 
  myself 
  (1910), 
  pp. 
  118, 
  119, 
  gave 
  as 
  

   diameters 
  of 
  0. 
  cincta 
  and 
  0. 
  villosa 
  : 
  " 
  Eyes, 
  8 
  on 
  each 
  side 
  

   of 
  the 
  head." 
  

  

  Orchesella 
  anomala 
  (Carp.), 
  mihi. 
  

   Entomohrya 
  anomala, 
  Carpenter, 
  (1906) 
  pp. 
  40-42, 
  pi, 
  ii. 
  figs. 
  8-15. 
  

  

  In 
  June 
  1905 
  Prof. 
  Carpenter 
  collected 
  some 
  spring-tails 
  

   from 
  Fair 
  Head, 
  Co. 
  Antrim, 
  and 
  in 
  1906 
  described 
  them 
  as 
  

   a 
  new 
  species 
  of 
  Entomohrya 
  of 
  somewhat 
  aberrant 
  type, 
  

   because 
  of 
  the 
  relatively 
  short 
  fourth 
  abdominal 
  segment 
  and 
  

   the 
  presence 
  of 
  six 
  distinct 
  segments 
  in 
  the 
  feeler, 
  these 
  being 
  

   characteristic 
  of 
  the 
  genus 
  Orchesella. 
  Prof. 
  Carpenter 
  was 
  

   under 
  the 
  impression 
  that 
  Orchesella 
  possessed 
  only 
  six 
  eyes, 
  

   and 
  regarded 
  the 
  extreme 
  reduction 
  of 
  the 
  two 
  hinder 
  median 
  

   ocelli 
  (Guthrie's 
  G 
  and 
  H) 
  in 
  E. 
  anomala 
  as 
  being 
  an 
  

   approach 
  towards 
  Orchesella. 
  Having 
  shown 
  above 
  that 
  

   eight 
  is 
  the 
  normal 
  number 
  of 
  eyes, 
  1 
  include 
  Carpenter's 
  

   anomala 
  in 
  Orchesella. 
  

  

  Another 
  character 
  by 
  which 
  the 
  two 
  genera 
  may 
  be 
  sepa- 
  

   rated 
  is 
  by 
  the 
  end-knob 
  of 
  the 
  antenna, 
  this 
  being 
  present 
  in 
  

   Entomohrya, 
  but 
  absent 
  in 
  Orchesella 
  (see 
  figs. 
  2, 
  3). 
  

  

  The 
  presence 
  of 
  (so-called) 
  6-scgmented 
  antennas 
  has 
  been 
  

   given 
  as 
  a 
  feature 
  of 
  the 
  genus 
  Orchesella. 
  This 
  is 
  only 
  

   partially 
  correct, 
  for 
  young 
  specimens 
  have 
  4-jointed 
  antennae, 
  

   but 
  as 
  they 
  grow 
  older 
  the 
  first 
  two 
  joints 
  each 
  divide 
  into 
  

  

  * 
  Since 
  writing 
  the 
  above, 
  I 
  have 
  obtained 
  a 
  copy 
  of 
  a 
  paper 
  by 
  

   Guthrie 
  (1906) 
  on 
  the 
  Collembolai] 
  eye, 
  in 
  which 
  (p. 
  240) 
  he 
  gives 
  the 
  

   correct 
  number 
  of 
  eyes. 
  He 
  also 
  suggests 
  that 
  the 
  individual 
  ocelli 
  are 
  

   probably 
  homologous 
  in 
  all 
  the 
  different 
  species, 
  and 
  that 
  they 
  are 
  

   arranged 
  more 
  or 
  less 
  in 
  a 
  certain 
  pattern, 
  somewhat 
  in 
  the 
  shape 
  of 
  the 
  

   letter 
  S- 
  He 
  has 
  assigned 
  letters 
  A-H 
  to 
  the 
  eight 
  eyes, 
  and 
  1 
  have 
  

   lettered 
  them 
  in 
  the 
  same 
  order 
  in 
  my 
  illustration 
  of 
  the 
  eye-spot 
  of 
  

   Orchesella 
  villosa. 
  

  

  Ann. 
  & 
  Mag. 
  N. 
  Hist. 
  Ser. 
  8. 
  Vol. 
  xiii. 
  5 
  

  

  