﻿178 
  

  

  CONTAGIOUS 
  DISEASES 
  OF 
  THE 
  CHINCH-BUG. 
  

  

  lines 
  into 
  three 
  parts, 
  using 
  the 
  meridians 
  of 
  96° 
  40' 
  west 
  and 
  99° 
  west 
  

   as 
  dividing 
  lines, 
  it 
  will 
  be 
  observed 
  (see 
  map 
  of 
  Kansas, 
  p. 
  172) 
  that 
  the 
  

   "chinch-bug 
  region" 
  of 
  the 
  State 
  is 
  included 
  in 
  the 
  eastern 
  and 
  central 
  divi- 
  

   sions. 
  In 
  each 
  of 
  these 
  divisions 
  I 
  have 
  selected 
  five 
  meteorological 
  stations. 
  

   These 
  stations 
  are 
  located 
  so 
  as 
  to 
  represent 
  with 
  some 
  degree 
  of 
  equality 
  the 
  

   east 
  and 
  west 
  extent 
  of 
  this 
  chinch-bug 
  region, 
  and 
  less 
  equally 
  the 
  south 
  

   and 
  north 
  extent 
  of 
  it. 
  I 
  think 
  that 
  the 
  tables 
  compiled 
  from 
  the 
  reports 
  of 
  

   these 
  stations 
  may 
  be 
  considered 
  as 
  pretty 
  fairly 
  representing 
  the 
  meteoro- 
  

   logical 
  conditions 
  of 
  the 
  chinch-bug-infested 
  region 
  of 
  the 
  State 
  for 
  the 
  years 
  

   referred 
  to. 
  In 
  order 
  to 
  present 
  testimony 
  touching 
  Doctor 
  Thomas's 
  asser- 
  

   tion 
  that 
  " 
  two 
  successive 
  dry 
  years 
  are 
  necessary 
  to 
  the 
  development 
  of 
  these 
  

   insects 
  [chinch-bugs] 
  in 
  injurious 
  numbers," 
  I 
  include 
  1882 
  and 
  1883 
  in 
  the 
  ta- 
  

   bles, 
  my 
  first 
  definite 
  data 
  concerning 
  the 
  chinch-bugs 
  being 
  for 
  the 
  year 
  1884. 
  

   To 
  exhibit 
  the 
  influence 
  of 
  winter 
  temperature 
  and 
  precipitation, 
  (see 
  p. 
  174, 
  

   Doctor 
  Riley's 
  statement 
  that 
  moist 
  or 
  open 
  winters 
  are 
  prejudicial,) 
  tem- 
  

   perature 
  and 
  precipitation 
  records 
  for 
  the 
  winter 
  months 
  are 
  given. 
  The 
  tem- 
  

   perature 
  of 
  the 
  four 
  months, 
  April, 
  May, 
  June, 
  and 
  July 
  (grouped), 
  which 
  

   include 
  the 
  period 
  of 
  egg-laying 
  and 
  growth 
  from 
  larva 
  to 
  adult, 
  and 
  the 
  total 
  

   annual 
  rainfall, 
  and 
  the 
  total 
  rainfall 
  for 
  April, 
  May, 
  June 
  and 
  July 
  are 
  also 
  

   given. 
  The 
  immediate 
  influence 
  of 
  rain 
  at 
  the 
  time 
  of 
  the 
  chinch-bugs' 
  

   growth, 
  as 
  well 
  as 
  the 
  general 
  influence 
  of 
  wet 
  and 
  dry 
  years, 
  can 
  thus 
  be 
  de- 
  

   termined. 
  As 
  a 
  matter 
  of 
  interest, 
  I 
  present 
  also 
  a 
  table 
  showing 
  the 
  distri- 
  

   bution 
  of 
  rain 
  through 
  the 
  months 
  of 
  the 
  year 
  at 
  Lawrence, 
  made 
  up 
  from 
  

   my 
  own 
  observations 
  for 
  24 
  years. 
  

  

  * 
  TABLE 
  I. 
  1882. 
  

  

  Central 
  Division 
  : 
  

  

  Cunningrlkm 
  

  

  Concordia 
  

  

  Salina 
  

  

  Wellington 
  

  

  Fort 
  Riley 
  

  

  Eastern 
  Division 
  : 
  

  

  Manhattan 
  

  

  Topeka 
  

  

  Independence 
  

  

  Lawrence 
  

  

  Leavenworth 
  

  

  Means 
  for 
  the 
  State, 
  as 
  shown 
  by 
  the 
  rec- 
  

   ords 
  of 
  these 
  stations 
  

  

  Rainfall 
  (inches.) 
  

  

  36.10 
  

   •21.44 
  

  

  •28 
  . 
  35 
  

   •2. 
  r 
  ..2'2 
  

   34.00 
  

   27.60 
  

   •25.97 
  

  

  28 
  . 
  38 
  

  

  Total 
  for 
  

   April, 
  May, 
  

   June 
  and 
  

  

  July. 
  

  

  19 
  . 
  20 
  

  

  17.27 
  

  

  19.71 
  

   15.92 
  

   15.25 
  

   15.48 
  

   15.18 
  

  

  16.86 
  

  

  Total 
  for 
  

   Dec. 
  1881, 
  

   Jan. 
  and 
  

   Feb. 
  '82. 
  

  

  2.90 
  

  

  .78 
  

  

  1.37 
  

   1.59 
  

   3.44 
  

   2.26 
  

   3.18 
  

  

  •2.22 
  

  

  Temperature 
  ( 
  deg. 
  ) 
  

  

  Mean 
  of 
  , 
  Mean 
  of 
  

  

  April, 
  May, 
  Dec. 
  WSZ, 
  

  

  June 
  and 
  Jan. 
  and 
  

  

  July. 
  Feb. 
  '82. 
  

  

  66.62 
  

   64.88 
  

  

  65.27 
  

   64.72 
  

   68.22 
  

   65.82 
  

   65.15 
  

  

  65.81 
  

  

  36.83 
  

   36.66 
  

  

  36.80 
  

   36.70 
  

   41.30 
  

  

  38.14 
  

   38.20 
  

  

  37.80 
  

  

  