﻿Mechanism 
  of 
  the 
  Male 
  GentUd 
  Tube 
  in 
  Coleoplcra. 
  409 
  

  

  being 
  connected 
  to 
  the 
  base 
  of 
  the 
  median 
  lobe. 
  Tliese 
  

   muscles 
  do 
  not 
  touch 
  the 
  ejaculatory 
  duct 
  or 
  the 
  sac 
  except 
  

   where 
  the 
  former 
  passes 
  throu<i;h 
  from 
  the 
  body 
  cavity. 
  

   When 
  retracted 
  the 
  apex 
  of 
  the 
  sac 
  and 
  a 
  length 
  of 
  slack 
  

   ejaculatory 
  duct 
  lie 
  loose 
  within 
  this 
  muscular 
  bulb. 
  That 
  

   these 
  muscles 
  do 
  not 
  act 
  as 
  constrictors 
  of 
  the 
  duct 
  or 
  sac 
  

   is 
  perfectly 
  evident, 
  and 
  it 
  is 
  very 
  highly 
  probable 
  that 
  

   they 
  act 
  as 
  a 
  bulb 
  for 
  the 
  evagi 
  nation 
  of 
  the 
  sac. 
  The 
  

   retractors 
  of 
  the 
  sac 
  are 
  shown, 
  in 
  Straus-Durckheim's 
  work 
  

   arising 
  from 
  different 
  parts 
  of 
  the 
  sac 
  and 
  proceeding 
  to 
  a 
  

   point 
  apparently 
  on 
  the 
  wall 
  of 
  the 
  muscular 
  bulb. 
  It 
  

   would 
  at 
  first 
  appear 
  as 
  if 
  these 
  retractor 
  muscles 
  had 
  no 
  

   connection 
  with 
  the 
  median 
  lobe, 
  but 
  this 
  is 
  not 
  the 
  case, 
  

   for 
  the 
  dorsal 
  strut 
  of 
  the 
  median 
  lobe 
  proceeds 
  as 
  a 
  mem- 
  

   brane 
  to 
  this 
  point 
  and 
  the 
  muscles 
  are 
  attached 
  to 
  its 
  

   apex. 
  Geoiru/pes 
  ,sylvaiicu6 
  has 
  a 
  very 
  small 
  unspecialised 
  

   sac, 
  a 
  very 
  small 
  median 
  strut 
  and 
  no 
  muscular 
  bulb, 
  and 
  

   is 
  a 
  very 
  much 
  simpler 
  structure. 
  

  

  Dr. 
  Sharp 
  called 
  my 
  attention 
  to 
  some 
  peculiarities 
  of 
  

   the 
  sac 
  of 
  Anoplor/nalhus. 
  Upon 
  examination 
  I 
  find 
  that 
  

   there 
  are 
  three 
  ducts 
  opening 
  on 
  the 
  sac 
  at 
  three 
  distinct 
  

   spots. 
  Two 
  of 
  these 
  are 
  of 
  a 
  similar 
  nature 
  and 
  the 
  third 
  

   apparently 
  of 
  a 
  glandular 
  Jiature 
  ; 
  there 
  is 
  also 
  a 
  short 
  

   diverticulum 
  which 
  also 
  appears 
  to 
  be 
  of 
  a 
  glandular 
  nature. 
  

   Whether 
  the 
  two 
  similar 
  ducts 
  proceed 
  separately 
  to 
  the 
  

   testes 
  I 
  am 
  unable 
  to 
  say 
  from 
  examining 
  only 
  dried 
  

   specimens. 
  There 
  is 
  also 
  a 
  strange 
  arrangement 
  of 
  the 
  

   female 
  uterus. 
  

  

  Musculature. 
  

  

  As 
  two 
  representatives 
  of 
  the 
  Fhytophagoidea 
  type 
  I 
  have 
  

   selected 
  Rhyncho'phorus 
  ferrugincus 
  and 
  Sirangalia 
  armata. 
  

   The 
  S'phenophori 
  differ 
  from 
  the 
  other 
  llhynchophora 
  in 
  

   possessing 
  a 
  pseudotegmen 
  formed 
  by 
  the 
  chitinisation 
  of 
  

   part 
  of 
  the 
  membrane 
  connectijig 
  the 
  tegmeji 
  with 
  the 
  

   body 
  wall, 
  and 
  by 
  the 
  eighth 
  abdominal 
  segment 
  being 
  

   invaginated 
  within 
  the 
  seventh, 
  the 
  pygidium 
  being 
  formed 
  

   by 
  the 
  seventh 
  tergite. 
  In 
  Strangalia 
  armala 
  not 
  only 
  are 
  

   the 
  eighth 
  tergite 
  and 
  sternite 
  well 
  developed, 
  but 
  there 
  is 
  a 
  

   well-developed 
  ninth 
  segment, 
  a 
  condition 
  not 
  found 
  in 
  any 
  

   of 
  the 
  Rliyjichophora. 
  I 
  do 
  not 
  know 
  if 
  this 
  distinction 
  

   holds 
  throughout 
  the 
  Longicornia, 
  but 
  should 
  it 
  do 
  so 
  it 
  

   will 
  be 
  of 
  great 
  importance. 
  

  

  