﻿2. 
  Carabidoid 
  stage. 
  

  

  ORIGIN 
  OF 
  THE 
  COLEOPTERA, 
  ETC. 
  303 
  

  

  form 
  of 
  the 
  body 
  and 
  its 
  appendages, 
  both 
  explain 
  the 
  metamorphosis 
  of 
  

   insects 
  in 
  general 
  and 
  also 
  the 
  differences 
  between 
  the 
  larval 
  forms 
  of 
  

   the 
  different 
  orders. 
  

  

  The 
  following 
  view 
  will 
  convey 
  an 
  idea 
  of 
  the 
  larvae 
  of 
  the 
  Coleo- 
  

   pterous 
  families 
  which 
  in 
  a 
  general 
  way 
  correspond 
  to 
  the 
  different 
  larval 
  

   stages 
  of 
  the 
  Meloidse; 
  it 
  being 
  understood 
  that 
  the 
  resemblances 
  are 
  

   suggestive 
  and 
  general, 
  and 
  not 
  to 
  be 
  accepted 
  in 
  a 
  too 
  literal 
  sense. 
  

  

  r 
  In 
  Meloe 
  more 
  like 
  Campodea 
  than 
  

  

  1. 
  Primitive 
  triungulin 
  stage. 
  ^ 
  MeSf'"'*''' 
  

  

  ( 
  Stylopidae. 
  

  

  C 
  Oicindelidge. 
  

   Carabidae, 
  Dytiscidse, 
  Hydrophilidie. 
  

   SilphidsB, 
  Mtidularise, 
  Dermestidae, 
  

  

  Ooccinellidse, 
  etc. 
  

   Elateridse, 
  Lampyridse, 
  Telephoridte, 
  

  

  Oleridae, 
  Pyrochroidse. 
  

  

  ( 
  HisteridsB. 
  

  

  3. 
  Scarabseidoid 
  stage. 
  . 
  < 
  Scarabaeidse. 
  

  

  ( 
  Ptinidae. 
  

  

  f 
  Cerambycidae. 
  

   . 
  r^ 
  ,\ 
  . 
  1 
  Tenebrionidae. 
  

  

  4. 
  Coarctate 
  stage, 
  more 
  or 
  less 
  ! 
  Mordellidse. 
  

  

  cylindrical 
  and 
  apodous. 
  ) 
  Ourculiouidfe. 
  

  

  / 
  Scolytidae. 
  

  

  From 
  the 
  facts 
  and 
  considerations 
  which 
  have 
  been 
  presented, 
  we 
  

   are 
  disposed 
  to 
  believe, 
  subject, 
  of 
  course, 
  to 
  future 
  correction, 
  that 
  the 
  

   primitive 
  Ooleoptera 
  were 
  carnivorous 
  forms, 
  and 
  that 
  Jhe 
  scavenger 
  

   and 
  phytophagous 
  forms 
  have 
  been 
  derived 
  from 
  them, 
  and 
  are 
  there- 
  

   fore 
  secondary 
  products, 
  and 
  as 
  a 
  whole 
  of 
  more 
  recent 
  origin. 
  

  

  The 
  primitive 
  form 
  of 
  beetle 
  was 
  probably 
  a 
  Staphylinus-like 
  form, 
  

   with 
  a 
  long, 
  narrow 
  body 
  and 
  rudimentary 
  elytra, 
  and 
  carnivorous 
  in 
  

   habits. 
  This 
  has 
  been 
  suggested 
  by 
  Brauer,^^ 
  though 
  it 
  occurred 
  to 
  us 
  

   before 
  meeting 
  with 
  his 
  views. 
  

  

  Though 
  the 
  earliest 
  beetle 
  known 
  is 
  a 
  Carboniferous 
  weevil-like 
  form, 
  

   yet 
  we 
  imagine 
  the 
  Coleopterous 
  type 
  became 
  established 
  in 
  Devonian 
  

   or 
  Silurian 
  times, 
  when 
  there 
  may 
  have 
  existed 
  the 
  prototypes 
  of 
  the 
  ear- 
  

   wigs 
  and 
  beetles; 
  for 
  the 
  two 
  types 
  may 
  have 
  branched 
  off 
  from 
  some 
  

   Thysanuran 
  form. 
  On 
  the 
  other 
  hand, 
  the 
  primitive 
  Coleopterous 
  larva 
  

   may 
  have 
  sprung 
  from 
  some 
  metabolous 
  l^Teuropterous 
  form. 
  The 
  larva 
  

   of 
  Gyrinus 
  has 
  a 
  striking 
  resemblance 
  to 
  that 
  of 
  Corydalus 
  and 
  other 
  

   SSialidae, 
  so 
  much 
  so 
  that 
  a 
  terrestrial 
  Carabidous 
  form 
  most 
  probably 
  

   was 
  of 
  Neuropterous 
  origin, 
  as 
  indicated 
  in 
  our 
  diagram. 
  

  

  Origin 
  of 
  the 
  Diptera^ 
  Lepidoptera^ 
  and 
  Hymenoptera. 
  — 
  The 
  Euglossata 
  

   probably 
  had 
  a 
  common 
  origin 
  in 
  the 
  first 
  i^lace 
  from 
  the 
  metabolic 
  

  

  •^ 
  So 
  wirdunsder 
  staph 
  ylinusalseinederaltestenKaferfoi-nien 
  gelten, 
  etc. 
  Betra 
  htungeniiberdi© 
  

   "Verwandlung 
  der 
  Insekten 
  im 
  Sinne 
  der 
  Descendenz-Theorie, 
  von 
  F, 
  Braner, 
  Verb. 
  k. 
  k. 
  zool.-bot. 
  

   Gee., 
  Wien, 
  1869, 
  p.' 
  313. 
  

  

  