﻿( 
  vii 
  ) 
  

  

  Mr. 
  E. 
  Adkiu 
  exhibited 
  a 
  long 
  and 
  interesting 
  series 
  of 
  

   TriphcBfia 
  comes 
  [orhona), 
  from 
  various 
  parts 
  of 
  the 
  South 
  of 
  

   England, 
  Yorkshire, 
  Forres, 
  the 
  Isle 
  of 
  Man, 
  the 
  Isle 
  of 
  Lewis, 
  

   and 
  the 
  North 
  of 
  Ireland. 
  

  

  Mr. 
  G. 
  F. 
  Hampson 
  exhibited 
  a 
  series 
  of 
  varieties 
  of 
  

   Plotheia 
  frontalis, 
  Walk., 
  which 
  was 
  the 
  only 
  species 
  in 
  the 
  

   genus, 
  and 
  confined 
  to 
  Ceylon. 
  He 
  said 
  that 
  the 
  varied 
  forms 
  

   of 
  this 
  species 
  had 
  been 
  described 
  under 
  twenty-one 
  different 
  

   names 
  by 
  Walker, 
  Felder, 
  and 
  Moore. 
  

  

  Mr. 
  F. 
  Merrifield 
  exhibited 
  a 
  number 
  of 
  specimens 
  showing 
  

   that 
  the 
  colouring 
  of 
  the 
  spring 
  emergence 
  of 
  Selenia 
  illustraria, 
  

   as 
  well 
  as 
  that 
  of 
  the 
  summer 
  emergence, 
  was 
  materially 
  

   affected 
  by 
  the 
  temperature 
  to 
  which 
  the 
  pupa 
  was 
  exposed 
  

   in 
  its 
  later 
  stages. 
  Three 
  separate 
  broods 
  had 
  each 
  been 
  

   divided 
  into 
  two 
  parts, 
  the 
  pupee 
  of 
  one 
  division 
  being 
  exposed 
  

   to 
  a 
  temperature 
  of 
  80° 
  Fahr., 
  those 
  of 
  the 
  other 
  division 
  to 
  

   60°. 
  The 
  whole 
  of 
  those 
  so 
  treated, 
  so 
  far 
  as 
  they 
  had 
  yet 
  

   appeared, 
  were 
  exhibited. 
  Those 
  of 
  the 
  former 
  division 
  were 
  

   on 
  the 
  upper 
  surface 
  of 
  a 
  rather 
  uniform 
  light 
  chestnut 
  orange, 
  

   and 
  contrasted 
  with 
  the 
  greater 
  richness 
  and 
  darkness 
  and 
  

   variety 
  of 
  colour 
  in 
  the 
  latter, 
  the 
  lightest 
  specimen 
  of 
  which 
  

   was, 
  in 
  each 
  of 
  the 
  three 
  broods, 
  darker 
  than 
  the 
  darkest 
  of 
  the 
  

   other 
  division. 
  On 
  the 
  undersides 
  the 
  differences 
  were 
  equally 
  

   marked. 
  He 
  also 
  exhibited 
  samples 
  of 
  two 
  summer 
  broods 
  

   of 
  S. 
  illustraria 
  not 
  exhibited 
  before, 
  where 
  there 
  were 
  similar 
  

   differences 
  ; 
  in 
  this 
  case 
  the 
  cooler 
  division 
  had 
  been 
  at 
  about 
  

   60° 
  to 
  65°, 
  the 
  other 
  division 
  at 
  80° 
  ; 
  also 
  a 
  series 
  of 
  about 
  fifty 
  

   Ennomos 
  autumnaria 
  not 
  before 
  shown, 
  rather 
  more 
  than 
  half 
  

   having 
  been 
  during 
  the 
  later 
  pupal 
  stages 
  at 
  a 
  temperature 
  of 
  

   80°, 
  and 
  the 
  rest 
  of 
  them 
  during 
  these 
  stages 
  at 
  the 
  ordinary 
  

   temperature 
  of 
  a 
  room 
  in 
  July, 
  ranging 
  from 
  about 
  65° 
  to 
  70°, 
  

   the 
  general 
  colouring 
  of 
  the 
  latter 
  being 
  much 
  the 
  darker. 
  

   There 
  could 
  be 
  no 
  other 
  rational 
  explanation 
  of 
  these 
  differences 
  

   than 
  that 
  they 
  were 
  caused 
  by 
  temperature 
  ; 
  darkness, 
  richness 
  

   and 
  variety 
  of 
  colouring 
  being 
  in 
  the 
  case 
  of 
  these 
  insects 
  

   promoted 
  by 
  the 
  lower 
  temperature. 
  It 
  need 
  scarcely 
  be 
  

   added 
  that 
  a 
  temperature 
  influence, 
  which 
  thus 
  extended 
  to 
  

   the 
  colouring 
  of 
  the 
  individuals 
  belonging 
  to 
  both 
  the 
  spring 
  

   and 
  the 
  summer 
  forms 
  of 
  a 
  double 
  brooded 
  species 
  showing 
  

  

  