﻿506 
  Mr. 
  G. 
  F. 
  Mathew 
  on 
  the 
  effect 
  of 
  change 
  of 
  

  

  From 
  the 
  foregoing 
  table 
  it 
  will 
  be 
  seen 
  that 
  (1), 
  Eupi- 
  

   thecia 
  ahsinthiata 
  was 
  the 
  first 
  to 
  make 
  its 
  appearance, 
  

   the 
  first 
  specimen 
  emerging 
  on 
  the 
  22nd 
  January, 
  our 
  

   fourth 
  day 
  in 
  the 
  Red 
  Sea, 
  and 
  twenty-first 
  from 
  

   England, 
  the 
  average 
  temperature 
  on 
  that 
  day 
  being 
  

   77°. 
  This 
  species 
  was 
  peculiarly 
  affected, 
  the 
  greater 
  

   number 
  of 
  them 
  emerging 
  in 
  the 
  hottest 
  weather, 
  be- 
  

   tween 
  the 
  10th 
  and 
  30th 
  March, 
  after 
  which 
  they 
  con- 
  

   tinued 
  to 
  appear 
  at 
  intervals 
  up 
  to 
  the 
  26th 
  April, 
  by 
  

   which 
  time 
  the 
  ship 
  had 
  reached 
  Gibraltar 
  on 
  her 
  way 
  

   home. 
  But, 
  strange 
  to 
  say, 
  between 
  the 
  7th 
  and 
  13th 
  

   May, 
  while 
  we 
  were 
  at 
  Chatham, 
  fourteen 
  more 
  appeared. 
  

   The 
  weather 
  was 
  then 
  bright 
  and 
  warm. 
  

  

  (2). 
  Hadena 
  chenopodii 
  appeared 
  on 
  the 
  27th 
  January, 
  

   and 
  from 
  that 
  day 
  until 
  the 
  21st 
  March 
  they 
  continued 
  

   to 
  emerge 
  nearly 
  every 
  day, 
  the 
  greater 
  number, 
  how- 
  

   ever, 
  appearing 
  between 
  the 
  2nd 
  February 
  and 
  the 
  11th 
  

   March, 
  the 
  increasing 
  temperature 
  seeming 
  to 
  affect 
  

   them 
  more 
  rapidly 
  than 
  any 
  of 
  the 
  other 
  species, 
  

   although 
  one 
  remained 
  over, 
  and 
  did 
  not 
  hatch 
  until 
  

   the 
  7th 
  May, 
  at 
  Chatham. 
  

  

  (3). 
  Tceniocampa 
  stahilis. 
  Strange 
  to 
  say 
  this 
  species, 
  

   which 
  one 
  would 
  naturally 
  expect 
  to 
  be 
  the 
  first 
  to 
  feel 
  

   the 
  effects 
  of 
  an 
  increased 
  temperature, 
  did 
  not 
  put 
  in 
  

   an 
  appearance 
  until 
  the 
  7th 
  February, 
  the 
  day 
  after 
  the 
  

   ship 
  left 
  Colombo, 
  when 
  the 
  average 
  temperature 
  was 
  

   80°, 
  and 
  after 
  the 
  ship 
  had 
  been 
  nearly 
  three 
  weeks 
  in 
  

   tropical 
  weather. 
  

  

  (4). 
  Hadena 
  oleracea 
  was 
  not 
  so 
  quickly 
  affected 
  as 
  

   chenopodii, 
  the 
  first 
  emerging 
  on 
  the 
  7th 
  February, 
  and 
  

   the 
  second 
  on 
  the 
  13th, 
  from 
  which 
  time 
  they 
  came 
  out 
  

   daily 
  until 
  the 
  16th 
  March, 
  after 
  which 
  date 
  no 
  more 
  

   appeared. 
  

  

  (5). 
  Tcsniocampa 
  cruda 
  was 
  still 
  more 
  remarkable 
  than 
  

   stahilis, 
  as 
  the 
  only 
  specimen 
  bred 
  did 
  not 
  appear 
  until 
  

   the 
  14th 
  February. 
  

  

  (6). 
  Eupithecia 
  centaureata. 
  A 
  single 
  example 
  only 
  

   appeared 
  on 
  9th 
  March. 
  

  

  (7). 
  Eujnthecia 
  sitbnotata 
  -was 
  not 
  affected 
  by 
  the 
  in- 
  

   crease 
  of 
  temperature 
  until 
  the 
  13th 
  March, 
  the 
  day 
  

   before 
  we 
  arrived 
  at 
  Singapore 
  on 
  our 
  way 
  home, 
  when 
  

   the 
  first 
  specimen 
  appeared. 
  From 
  this 
  date 
  they 
  

   emerged 
  almost 
  daily 
  until 
  we 
  reached 
  Gibraltar 
  on 
  the 
  

   25th 
  April, 
  and 
  one 
  remained 
  over 
  and 
  came 
  out 
  at 
  

   Chatham 
  on 
  the 
  21st 
  Mav- 
  

  

  