﻿320 
  JOURNAL 
  OF 
  THE 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  VOL. 
  12, 
  NO. 
  13 
  

  

  blood, 
  and 
  whose 
  outer 
  ends 
  are 
  attached 
  to 
  the 
  spongy, 
  inner 
  layer 
  of 
  the 
  

   integument 
  which 
  serves 
  as 
  a 
  reservoir. 
  The 
  gland 
  cells 
  extract 
  a 
  substance 
  

   from 
  the 
  blood 
  and 
  store 
  it 
  in 
  the 
  reservoir, 
  from 
  which 
  it 
  passes 
  to 
  the 
  

   exterior 
  through 
  many 
  tiny 
  pores 
  lying 
  in 
  the 
  outer 
  layer 
  of 
  the 
  integument. 
  

   Once 
  on 
  the 
  integument, 
  the 
  secretion 
  evidently 
  spreads 
  out 
  in 
  a 
  film 
  over 
  

   the 
  entire 
  surface 
  of 
  the 
  appendages 
  and 
  abdomen. 
  

  

  This 
  paper 
  was 
  illustrated 
  by 
  two 
  anatomical 
  charts 
  which 
  were 
  explained 
  

   in 
  detail. 
  

  

  Notes 
  and 
  exhibition 
  of 
  specimens 
  

  

  A. 
  N. 
  CaudelIv 
  exhibited 
  a 
  specimen 
  of 
  a 
  remarkable 
  katydid, 
  the 
  re- 
  

   cently 
  described 
  Insctidderia 
  taxodii 
  Caudell, 
  which 
  feeds 
  only 
  on 
  cypress 
  in 
  

   the 
  southeastern 
  United 
  States. 
  

  

  Prof. 
  Carl 
  J. 
  Drake 
  spoke 
  of 
  collecting 
  on 
  cypress 
  in 
  Mississippi 
  and 
  

   Louisiana, 
  stating 
  that 
  certain 
  jassids 
  and 
  tingids 
  confine 
  their 
  attack 
  to 
  

   this 
  tree. 
  

  

  Mr. 
  RoHWER 
  stated 
  that 
  one 
  of 
  two 
  species 
  of 
  horntails 
  seem 
  to 
  breed 
  

   only 
  on 
  cypress, 
  and 
  that 
  certain 
  parasites 
  of 
  wood-boring 
  Coleoptera 
  also 
  

   seem 
  to 
  confine 
  themselves 
  to 
  this 
  tree 
  but 
  are 
  not 
  particular 
  as 
  to 
  the 
  sys- 
  

   tematic 
  position 
  of 
  their 
  insect 
  hosts. 
  

  

  Wm. 
  Middleton 
  stated 
  that 
  he 
  had 
  on 
  October 
  6, 
  1921, 
  liberated 
  20,000 
  

   adults 
  of 
  Schedius 
  kuvanae 
  Howard 
  in 
  Washington, 
  D. 
  C. 
  This 
  insect 
  is 
  a 
  

   chalcid 
  egg 
  parasite 
  of 
  the 
  gypsy 
  moth. 
  The 
  liberation 
  was 
  made 
  on 
  some 
  

   trees 
  along 
  B 
  St., 
  on 
  the 
  north 
  side 
  of 
  the 
  Museum, 
  which 
  had 
  a 
  large 
  number 
  

   of 
  egg 
  masses 
  of 
  the 
  white-marked 
  tussock 
  moth. 
  The 
  parasite 
  has 
  been 
  

   found 
  to 
  attack 
  the 
  egg 
  of 
  this 
  moth 
  under 
  laboratory 
  conditions 
  and 
  it 
  is 
  

   hoped 
  that 
  it 
  will 
  be 
  useful 
  in 
  aiding 
  in 
  controlling 
  it 
  here. 
  This 
  experiment 
  is 
  

   a 
  part 
  of 
  Dr. 
  Howard's 
  plan 
  for 
  getting 
  the 
  utmost 
  possible 
  good 
  from 
  such 
  

   parasitic 
  insects 
  as 
  are 
  introduced 
  into 
  this 
  country. 
  

  

  S. 
  A. 
  RoHWER 
  said 
  he 
  was 
  glad 
  this 
  liberation 
  of 
  parasites 
  was 
  recorded 
  

   and 
  hoped 
  that 
  all 
  such 
  liberations 
  would 
  be 
  made 
  matters 
  of 
  record 
  and 
  placed 
  

   available 
  to 
  all 
  specialists. 
  Unless 
  this 
  is 
  done, 
  the 
  specialist 
  is 
  often 
  puzzled 
  

   when 
  dealing 
  with 
  distribution 
  of 
  species 
  and 
  often 
  has 
  trouble 
  in 
  making 
  

   identifications. 
  

  

  As 
  an 
  illustration 
  of 
  the 
  phenomenon 
  of 
  predaceous 
  and 
  parasitic 
  insects 
  

   confining 
  their 
  attacks 
  to 
  those 
  insects 
  which 
  infest 
  a 
  given 
  plant 
  rather 
  

   than 
  to 
  a 
  given 
  host 
  species 
  or 
  genus, 
  J. 
  A. 
  Hyslop 
  discussed 
  the 
  two 
  common 
  

   species 
  of 
  the 
  genus 
  Alatis, 
  A. 
  oculaius 
  and 
  A. 
  myops. 
  The 
  larvae 
  of 
  both 
  

   of 
  these 
  beetles 
  are 
  exclusively 
  predaceous, 
  feeding 
  on 
  several 
  species 
  of 
  

   wood-boring 
  larvae, 
  but, 
  despite 
  the 
  fact 
  that 
  they 
  are 
  not 
  wood 
  feeders, 
  

   A. 
  octdatiis 
  is 
  always 
  found 
  in 
  deciduous 
  trees 
  and 
  A. 
  myops 
  invariably 
  in 
  

   conifers. 
  

  

  Dr. 
  A. 
  C. 
  Baker 
  reported 
  the 
  results 
  of 
  some 
  rearing 
  experiments 
  with 
  

   the 
  apple-grain 
  aphis 
  (the 
  Aphis 
  avenae 
  of 
  some 
  American 
  authors). 
  He 
  

   pointed 
  out 
  that 
  the 
  theory 
  of 
  evolution 
  based 
  on 
  natural 
  selection 
  as 
  pro- 
  

   pounded 
  by 
  Darwin 
  has 
  been 
  discarded 
  by 
  most 
  of 
  the 
  experimental 
  workers 
  

   in 
  zoology. 
  Darwin 
  based 
  his 
  theory 
  on 
  small 
  continuous 
  variations 
  while 
  

   most 
  of 
  these 
  recent 
  workers 
  pin 
  their 
  faith 
  to 
  discontinuous 
  variations. 
  

   In 
  the 
  mean 
  time 
  Johannsen 
  established 
  his 
  pure 
  line 
  theory 
  which 
  claims 
  

   that 
  self-fertilized 
  forms 
  or 
  forms 
  reproducing 
  as 
  in 
  parthenogenesis 
  will 
  

   remain 
  true 
  showing 
  only 
  fluctuations. 
  Finally 
  Lotsy 
  has 
  recently 
  dispensed 
  

   altogether 
  with 
  variations. 
  "The 
  cause 
  of 
  evolution 
  lies 
  in 
  the 
  interaction 
  

  

  