﻿198 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  ency 
  to 
  gather 
  themselves 
  into 
  bundles, 
  which, 
  though 
  they 
  run 
  in 
  va- 
  

   rious 
  directions, 
  have 
  a 
  common 
  trend 
  parallel 
  to 
  the 
  ovarian 
  tubes. 
  

   The 
  interspaces 
  of 
  the 
  network 
  are, 
  for 
  the 
  most 
  part, 
  of 
  an 
  elongated, 
  

   rounded 
  form, 
  their 
  long 
  axes 
  being 
  parallel 
  with 
  the 
  general 
  trend 
  of 
  

   the 
  fibres. 
  The 
  majority 
  of 
  the 
  nuclei 
  are 
  irregularly 
  oval 
  in 
  shape, 
  and 
  

   contain 
  numerous 
  granules, 
  which 
  are 
  darkly 
  stained 
  by 
  ha3matoxiline. 
  

   Whether 
  these 
  nuclei 
  belong 
  to 
  the 
  fibrous 
  tissue 
  itself 
  or 
  to 
  an 
  endothe- 
  

   lium 
  covering 
  it, 
  I 
  cannot 
  say. 
  The 
  latter 
  view 
  seems 
  to 
  me 
  more 
  prob- 
  

   able. 
  

  

  A 
  very 
  singular 
  modification 
  of 
  this 
  tissue 
  may 
  be 
  found 
  in 
  the 
  tunica 
  

   propria 
  of 
  the 
  Malpighian 
  vessels 
  of 
  Anabrus. 
  Spiral 
  bands 
  wind 
  round 
  

   the 
  tubes. 
  These 
  bands 
  are 
  composed 
  of 
  a 
  network 
  of 
  fine 
  fibres, 
  with 
  

   small 
  meshes 
  and 
  occasional 
  granular 
  oval 
  nuclei, 
  each 
  of 
  which 
  is 
  sur. 
  

   rounded 
  by 
  a 
  little 
  court 
  { 
  u 
  hof 
  n 
  ) 
  of 
  protoplasm. 
  At 
  first 
  sight 
  these 
  

   bands 
  might 
  be 
  taken 
  for 
  a 
  nervous 
  plexus, 
  but 
  closer 
  examination 
  re- 
  

   veals 
  their 
  true 
  character. 
  In 
  the 
  locusts, 
  as 
  will 
  be 
  described 
  shortly, 
  

   there 
  is 
  a 
  trachea 
  which 
  winds 
  round 
  each 
  Malpighian 
  tube 
  in 
  a 
  spiral. 
  

   It 
  is 
  possible 
  that 
  a 
  similar 
  disposition 
  exists 
  in 
  Anabrus, 
  though 
  I 
  have 
  

   not 
  observed 
  it. 
  In 
  that 
  case 
  the 
  spiral 
  bands 
  of 
  connective 
  tissue 
  in 
  

   the 
  latter 
  insect 
  may 
  be 
  the 
  means 
  of 
  fastening 
  the 
  trachea 
  to 
  the 
  walls 
  

   of 
  the 
  Malpighian 
  tube. 
  

  

  The 
  trabecular 
  or 
  retiform 
  modification 
  of 
  the 
  connective 
  tissue 
  is 
  

   probably 
  very 
  generally, 
  if 
  not 
  always, 
  to 
  be 
  found 
  in 
  all 
  invertebrates 
  

   above 
  the 
  Godenterata. 
  It 
  does 
  not 
  seem 
  to 
  me 
  necessary 
  to 
  give 
  ex- 
  

   tended 
  references. 
  I 
  will, 
  however, 
  mention 
  Grobben's 
  figure. 
  266 
  

  

  The 
  nervous 
  chain 
  of 
  Lepidoptera 
  is 
  covered 
  in 
  the 
  abdomen, 
  but 
  not 
  

   in 
  the 
  thorax, 
  by 
  a 
  cord 
  of 
  connective 
  tissue, 
  originally 
  described 
  by 
  

   Treviranus 
  as 
  a 
  ventral 
  vessel, 
  " 
  Bauchgefass." 
  Its 
  true 
  nature 
  was 
  

   first 
  recognized 
  by 
  Leydig 
  in 
  1862, 
  and 
  more 
  recently 
  it 
  has 
  been 
  the 
  

   object 
  of 
  a 
  special 
  study 
  by 
  Dionys 
  Burger, 
  267 
  who 
  proposes 
  for 
  it 
  the 
  

   name 
  of 
  chorda 
  supraspinous. 
  It 
  is 
  to 
  be 
  hoped 
  that 
  subsequent 
  inves- 
  

   tigators 
  will 
  search 
  for 
  this 
  organ 
  in 
  the 
  Orthoi>tera 
  and 
  other 
  insects 
  in 
  

   which 
  we 
  may 
  reasonably 
  expect 
  to 
  find 
  it. 
  

  

  SEXUAL 
  ORGANS. 
  

  

  I. 
  — 
  Female 
  organs. 
  

  

  Ovary. 
  — 
  The 
  ovary 
  is 
  composed 
  of 
  a 
  number 
  of 
  separate 
  tubes, 
  each 
  

   of 
  which 
  is 
  more 
  or 
  less 
  independent. 
  They 
  all 
  have 
  essentially 
  the 
  

   same 
  structure 
  histologically, 
  the 
  differences 
  I 
  have 
  observed 
  relating 
  

   merely 
  to 
  the 
  proportions 
  of 
  the 
  parts 
  to 
  one 
  another. 
  Every 
  ovarian 
  

   tube 
  begins 
  in 
  the 
  thorax 
  with 
  a 
  small 
  cord 
  (Fig. 
  G4 
  ch.) 
  of 
  connective 
  

   tissue, 
  which 
  is 
  said 
  to 
  be 
  attached 
  to 
  the 
  heart. 
  268 
  Graber 
  states 
  that 
  in 
  

  

  206 
  Qrobben 
  : 
  Die 
  Geschlcchtorgano 
  von 
  Squilla 
  mantis. 
  Sitzber. 
  Wien 
  Akad., 
  Bd. 
  lxxiv 
  1. 
  Abth., 
  

   p. 
  389. 
  (Fig. 
  8 
  of 
  plate.) 
  

  

  207 
  Burger, 
  Dionys 
  : 
  Uber 
  das 
  sogenannte 
  Bauchgefass, 
  etc. 
  Nicderl. 
  Archiv. 
  fax 
  Zoo!., 
  iii 
  ( 
  187G), 
  p. 
  97. 
  

   268 
  Leydig, 
  Burmeister, 
  Waldoyor, 
  Lubbock, 
  and 
  others. 
  

  

  