﻿THE 
  GEAPE-BEEEY 
  MOTH. 
  

  

  33 
  

  

  Table 
  IV. 
  

  

  -Length 
  of 
  incubation 
  of 
  first 
  brood 
  of 
  eggs 
  of 
  the 
  grape-berry 
  moth 
  at 
  North 
  

   East, 
  Pa., 
  in 
  1909. 
  

  

  No. 
  of 
  obser- 
  

   vation. 
  

  

  Date- 
  

  

  Days 
  of 
  

   incu- 
  

   bation. 
  

  

  No. 
  of 
  obser- 
  

   vation. 
  

  

  Date- 
  

  

  Days 
  of 
  

   incu- 
  

   bation. 
  

  

  Laid. 
  

  

  Hatched. 
  

  

  Laid. 
  

  

  Hatched. 
  

  

  1 
  

  

  2. 
  

  

  June 
  25 
  

   June 
  26 
  

   June 
  27 
  

   June 
  28 
  

  

  ...do.... 
  

   June 
  29 
  

  

  ...do.... 
  

   June 
  30 
  

   July 
  1 
  

   July 
  2 
  

  

  . 
  . 
  .do. 
  . 
  . 
  . 
  

  

  June 
  29 
  

   July 
  1 
  

   July 
  2 
  

   July 
  4 
  

   July 
  5 
  

   ...do.... 
  

   July 
  6 
  

   July 
  7 
  

   July 
  8 
  

   July 
  9 
  

   July 
  10 
  

  

  4 
  

   5 
  

   5 
  

   6 
  

  

  7 
  

   6 
  

   7 
  

   7 
  

  

  7 
  

   7 
  

   8 
  

  

  12. 
  

  

  July 
  3 
  

   ...do 
  

  

  July 
  10 
  

   July 
  11 
  

  

  ...do 
  

  

  July 
  12 
  

  

  ...do 
  

  

  July 
  13 
  

  

  ...do 
  

  

  July 
  16 
  

   July 
  17 
  

   July 
  18 
  

  

  7 
  

   8 
  

   6 
  

   6 
  

   5 
  

   5 
  

   4 
  

   6 
  

   5 
  

   6 
  

  

  13 
  

  

  3 
  

  

  4 
  

  

  5 
  

  

  6 
  

  

  14 
  

  

  July 
  5 
  

   July 
  6 
  

   July 
  7 
  

   July 
  8 
  

   July 
  9 
  

   July 
  10 
  

   July 
  12 
  

   ...do 
  

  

  15 
  

  

  16. 
  

  

  17... 
  

  

  7 
  

  

  8. 
  ... 
  

  

  18 
  

  

  19 
  

  

  9 
  

  

  20. 
  

  

  10 
  

  

  21... 
  

  

  11 
  

  

  

  

  

  

  Days 
  of 
  incubation: 
  

  

  Average 
  

  

  Maximum 
  

  

  Minimum 
  

  

  Length 
  oj 
  jeeding 
  period 
  oj 
  first-brood 
  larvse. 
  — 
  The 
  records 
  for 
  the 
  

   length 
  of 
  the 
  feeding 
  period 
  of 
  the 
  first-brood 
  larvae 
  are 
  given 
  in 
  

   Table 
  XI 
  (p. 
  37), 
  which 
  shows 
  a 
  range 
  from 
  19 
  to 
  33 
  days 
  and 
  an 
  

   average 
  of 
  23.2 
  days. 
  The 
  small 
  number 
  of 
  observations 
  made 
  

   was 
  due 
  to 
  the 
  difficulty 
  of 
  securing 
  the 
  deposition 
  of 
  a 
  larger 
  num- 
  

   ber 
  of 
  eggs 
  from 
  the 
  moths 
  in 
  captivity. 
  

  

  Length 
  oj 
  pupal 
  stage 
  oj 
  first 
  brood. 
  — 
  Table 
  V 
  gives 
  the 
  time 
  of 
  leav- 
  

   ing 
  the 
  fruit 
  of 
  285 
  first-brood 
  larvae 
  and 
  the 
  date 
  of 
  emergence 
  of 
  the 
  

   moths. 
  The 
  average 
  time 
  for 
  making 
  the 
  cocoon 
  was 
  approximately 
  

   2 
  days. 
  The 
  minimum 
  time 
  covered 
  from 
  leaving 
  of 
  fruit 
  to 
  emer- 
  

   gence 
  of 
  moths 
  was 
  10 
  days, 
  the 
  average 
  15.2 
  days, 
  and 
  the 
  maxi- 
  

   mum 
  25 
  days. 
  Therefore, 
  deducting 
  2 
  days 
  spent 
  by 
  the 
  larva 
  in 
  

   making 
  the 
  cocoon 
  the 
  minimum 
  pupal 
  period 
  was 
  8 
  days, 
  the 
  average 
  

   13.2 
  days, 
  and 
  the 
  maximum 
  23 
  days. 
  

   60141°— 
  Bull. 
  116, 
  pt 
  2—12 
  4 
  

  

  