﻿Ixxiv 
  

  

  one 
  at 
  the 
  back. 
  When 
  full 
  grown 
  it 
  is 
  about 
  1 
  1 
  cm. 
  long 
  and 
  

   If 
  cm. 
  thick. 
  Its 
  colouring 
  is 
  like 
  the 
  bark 
  of 
  the 
  tree. 
  The 
  

   puj^a 
  is 
  very 
  like 
  that 
  of 
  Basilona 
  imperialis, 
  but 
  smaller 
  

   and 
  jet 
  black. 
  They 
  go 
  to 
  earth 
  to 
  pupate. 
  The 
  food-plant 
  

   is 
  thorny, 
  and 
  the 
  leaves 
  have 
  three 
  spikes 
  and 
  are 
  very 
  thick. 
  

   The 
  caterpillar 
  when 
  first 
  emerging 
  from 
  the 
  egg 
  has 
  the 
  

   characteristic 
  spikes 
  on 
  the 
  Horns, 
  but 
  as 
  it 
  changes 
  its 
  skin 
  

   this 
  disappears, 
  till 
  the 
  horn 
  of 
  the 
  full-grown 
  caterpillar 
  

   developes 
  only 
  rows 
  of 
  papillae. 
  — 
  F. 
  Lindeman, 
  Cordoba, 
  

   Argentina." 
  

  

  Seasonal 
  Forms 
  op 
  Teracolus 
  rogersi. 
  — 
  Dr. 
  F. 
  A. 
  

   DixEY 
  exhibited 
  specimens 
  of 
  Teracolus 
  rogersi, 
  and 
  remarked 
  

   on 
  them 
  as 
  follows 
  : 
  — 
  

  

  " 
  Some 
  years 
  since, 
  the 
  Rev. 
  K. 
  St. 
  A. 
  Rogers, 
  who 
  has 
  done 
  

   such 
  excellent 
  work 
  on 
  the 
  Rhopalocera 
  of 
  British 
  East 
  Africa, 
  

   sent 
  home 
  specimens 
  of 
  a 
  new 
  form 
  of 
  Teracolus, 
  belonging 
  

   to 
  the 
  ackine 
  group, 
  which 
  had 
  been 
  captured 
  and 
  bred 
  by 
  him 
  

   at 
  Taveta 
  in 
  the 
  months 
  of 
  July 
  and 
  August, 
  1905 
  and 
  1910. 
  

   These 
  were 
  figured 
  and 
  described 
  in 
  our 
  ' 
  Transactions 
  ' 
  for 
  

   1915 
  as 
  Teracolus 
  rogersi.* 
  They 
  were 
  all 
  of 
  the 
  dry-season 
  

   form, 
  the 
  wet-season 
  phase 
  being 
  then, 
  and 
  for 
  a 
  long 
  time 
  

   after, 
  unknown. 
  Specimens 
  have, 
  however, 
  now 
  been 
  received 
  

   from 
  Mr. 
  Rogers 
  which 
  there 
  is 
  no 
  difficulty 
  in 
  recognising 
  as 
  

   the 
  wet-season 
  forms 
  corresponding 
  to 
  the 
  dry-season 
  types. 
  

  

  " 
  I 
  exhibit 
  a 
  male 
  and 
  female 
  of 
  this 
  latter 
  phase, 
  both 
  cap- 
  

   tured 
  at 
  Kiboriani 
  on 
  March 
  23, 
  1918. 
  They 
  are, 
  as 
  might 
  be 
  

   expected, 
  more 
  heavily 
  marked 
  than 
  the 
  dry-season 
  types; 
  

   and 
  show 
  beneath 
  a 
  well-marked 
  dark 
  veining, 
  and 
  a 
  pale 
  

   ground-colour 
  with 
  yellowish 
  bands 
  in 
  place 
  of 
  the 
  dusky 
  

   reddish-ochreous 
  of 
  the 
  types. 
  

  

  " 
  The 
  form 
  is 
  nearly 
  related 
  to 
  T. 
  halyaUes, 
  Butl., 
  the 
  type 
  

   of 
  which 
  came 
  from 
  Natal. 
  It 
  may 
  no 
  doubt 
  be 
  considered 
  as 
  

   the 
  representative 
  of 
  that 
  species 
  in 
  British 
  and 
  ' 
  German 
  ' 
  

   East 
  Africa." 
  

  

  Lord 
  Rothschild 
  asked 
  whether 
  the 
  small 
  size 
  of 
  the 
  dry- 
  

   season 
  form, 
  the 
  opposite 
  of 
  what 
  occurs 
  in 
  Precis, 
  was 
  charac- 
  

   teristic 
  in 
  Teracolus, 
  to 
  which 
  Dr. 
  Dixey 
  replied 
  that 
  it 
  is 
  usual 
  

   but 
  not 
  perhaps 
  universal; 
  Dr. 
  Marshall 
  said 
  that 
  the 
  

   * 
  Trans. 
  Ent. 
  Soc. 
  Lond., 
  1915, 
  p. 
  1, 
  PI. 
  I, 
  figs. 
  1-4. 
  

  

  