﻿LOCUST 
  RAVAGES 
  IN 
  CALIFORNIA. 
  243 
  

  

  try, 
  is 
  divided 
  into 
  three 
  groups, 
  Truxalini, 
  Acridini, 
  and 
  (Edipodini^ 
  

   the 
  migratory 
  species 
  being 
  confined 
  to 
  the 
  second 
  and 
  third, 
  which 
  are 
  

   distinguished 
  from 
  each 
  other 
  "by 
  the 
  presence 
  or 
  absence 
  of 
  a 
  prosternal 
  

   spine 
  or 
  tubercle, 
  thus 
  : 
  

  

  a 
  Prosternum 
  or 
  front 
  breast 
  armed 
  with 
  a 
  spine 
  or 
  tuberclo 
  Aeridini. 
  

  

  aa 
  Presternum 
  unarmed 
  CEdipodini. 
  

  

  To 
  the 
  former 
  group 
  belong 
  most 
  of 
  the 
  migratory 
  species, 
  to 
  wit 
  : 
  

   Acridium 
  peregrinum, 
  A. 
  paranense, 
  A. 
  americanum 
  (if 
  this 
  is 
  the 
  Central 
  

   American 
  locust, 
  which 
  is 
  doubtful), 
  Caloptenus 
  italicus, 
  and 
  C. 
  spretus. 
  

  

  To 
  the 
  latter 
  belong 
  Paehytylus 
  migratorius 
  and 
  Camnula 
  pellucida. 
  

   The 
  former 
  of 
  these 
  two 
  species, 
  which 
  is 
  large, 
  measuring 
  about 
  two 
  

   inches 
  in 
  length, 
  is 
  found 
  only 
  on 
  the 
  Eastern 
  Continent 
  ; 
  the 
  latter, 
  

   which 
  is 
  comparatively 
  small, 
  is 
  found 
  only 
  in 
  North 
  America. 
  

  

  The 
  genus 
  Camnula^ 
  which 
  w 
  r 
  as 
  established 
  by 
  Stal, 
  is, 
  according 
  to 
  

   that 
  author, 
  distinguished 
  from 
  other 
  genera 
  of 
  the 
  same 
  group 
  by 
  the 
  

   following 
  characteristics 
  : 
  

  

  The 
  fastigium 
  of 
  the 
  vertex 
  slightly 
  deflexed, 
  rather 
  narrow.; 
  seen 
  from 
  the 
  side 
  it 
  

   forms 
  an 
  obtuse 
  angle 
  with 
  the 
  frontal 
  costa, 
  concave, 
  not 
  carinated 
  (that 
  is, 
  without 
  

   a 
  median 
  carina), 
  nor 
  terminated 
  posteriorly 
  by 
  a 
  carina, 
  but 
  in 
  fact 
  by 
  a 
  slender 
  

   transverse 
  impression 
  ; 
  frontal 
  costa 
  slightly 
  sulcatc, 
  distinctly 
  narrowed 
  below 
  the 
  

   ocellus 
  ; 
  the 
  pronotum 
  with 
  the 
  lateral 
  margins 
  distinctly 
  carinated 
  ; 
  the 
  (posterior) 
  

   sulcus 
  divides 
  the 
  median 
  carina, 
  but 
  is 
  usually 
  interrupted 
  by 
  the 
  lateral 
  carinas 
  

   which 
  are 
  usually 
  severed 
  by 
  the 
  middle 
  or 
  anterior 
  sulcus 
  ; 
  the 
  posterior 
  lobe 
  is 
  dis- 
  

   tinctly 
  longer 
  than 
  the 
  anterior 
  surface, 
  not 
  granulated 
  or 
  rugose. 
  

  

  CAMNULA 
  PELLUCIDA. 
  

  

  <Edipoda 
  pellucida 
  Scudd., 
  Bost. 
  Jour. 
  Nat. 
  Hist. 
  VII, 
  1862. 
  

  

  atrox 
  Scudd., 
  Hayden's 
  Geol. 
  Surv. 
  Neb., 
  253. 
  

   Camnula 
  tricarinata 
  Stal, 
  Recens. 
  Orthop., 
  1873. 
  

  

  In 
  order 
  that 
  the 
  reader 
  may 
  judge 
  for 
  himself 
  in 
  reference 
  to 
  the 
  

   identity 
  of 
  the 
  species, 
  we 
  give 
  here 
  the 
  three 
  original 
  descriptions. 
  

  

  (E. 
  pellucida 
  Scudd. 
  

  

  Ash-brown 
  ; 
  face 
  reddish 
  brown 
  ; 
  antennae 
  yellowish 
  at 
  base, 
  dark 
  brown 
  toward 
  

   tip 
  ; 
  a 
  triangular 
  black 
  spot 
  behind 
  the 
  eye, 
  the 
  apex 
  touching 
  it 
  ; 
  a 
  quadrate 
  trans- 
  

   verse 
  black 
  spot 
  on 
  the 
  anterior 
  upper 
  portion 
  of 
  the 
  sides 
  of 
  pronotum 
  ; 
  pronotum 
  

   above, 
  sometimes 
  with 
  a 
  dark 
  band 
  down 
  the 
  middle 
  ; 
  wing 
  covers 
  with 
  the 
  basal 
  half 
  

   dark 
  brown, 
  with 
  small 
  yellowish 
  spots 
  and 
  transverse 
  streaks, 
  especially 
  on 
  front 
  

   border 
  ; 
  apical 
  half 
  clear, 
  with 
  dark 
  brown 
  rounded 
  spots, 
  prevalent 
  along 
  the 
  middle, 
  

   decreasing 
  in 
  size 
  toward 
  the 
  tip 
  ; 
  when 
  closed 
  the 
  upper 
  surface 
  is 
  dark 
  brown, 
  with 
  

   a 
  rather 
  broad 
  yellowish 
  vitta 
  along 
  each 
  angle 
  on 
  the 
  upper 
  surface 
  ; 
  wings 
  pellucid, 
  

   with 
  black 
  nervules; 
  legs 
  dark 
  brown, 
  the 
  hind 
  femora 
  yellowish 
  or 
  reddish 
  brown, 
  

   with 
  two 
  or 
  three 
  rather 
  broad 
  diagonal 
  dark 
  brown 
  streaks, 
  dark 
  at 
  the 
  apex 
  ; 
  hind 
  

   tibiae 
  yellowish 
  brown, 
  reddish 
  toward 
  the 
  tip, 
  with 
  a 
  very 
  narrow, 
  generally 
  faint, 
  

   annulation 
  of 
  dark 
  brown 
  at 
  the 
  base 
  ; 
  spines 
  tipped 
  with 
  black. 
  

  

  Length 
  of 
  body 
  : 
  male 
  .65 
  inch, 
  female 
  1 
  inch 
  ; 
  spread 
  of 
  wings 
  : 
  male 
  1.3 
  inches, 
  fe- 
  

   male 
  1.6 
  inches 
  ; 
  depth 
  of 
  wings 
  : 
  male 
  .33 
  iuch 
  ; 
  female 
  .4 
  inch. 
  

  

  (E. 
  atrox 
  Scudd. 
  

  

  Head 
  uniform, 
  pale 
  brownish 
  yellow 
  ; 
  the 
  raised 
  edge 
  of 
  the 
  vertex 
  dotted 
  with 
  fus- 
  

   cous; 
  a 
  dark 
  fuscous 
  spot 
  behind 
  the 
  eye, 
  broadening 
  posteriorly, 
  but 
  not 
  extending 
  

  

  