﻿50 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  - 
  

  

  In 
  this 
  connectiou 
  we 
  may 
  add 
  that 
  Diodorus 
  Siculus 
  says 
  "the 
  west, 
  

   north, 
  northwest, 
  and 
  east 
  winds 
  blow 
  in 
  Ethiopia 
  as 
  in 
  other 
  parts 
  of 
  

   the 
  world; 
  but 
  the 
  south 
  winds 
  never 
  blow, 
  nor 
  are 
  ever 
  known 
  in 
  

   Ethiopia" 
  117 
  . 
  

  

  The 
  visitation 
  of 
  Algiers 
  by 
  these 
  pests 
  in 
  1866 
  was 
  so 
  severe 
  that 
  it 
  

   drew 
  a 
  special 
  official 
  circular 
  from 
  Marshal 
  Canrobert. 
  They 
  first 
  ap- 
  

   peared 
  during 
  the 
  month 
  of 
  April, 
  coming 
  from 
  the 
  gorges 
  of 
  the 
  moun- 
  

   tains 
  and 
  the 
  fertile 
  valleys 
  of 
  the 
  Littoral. 
  They 
  descended 
  first 
  on 
  

   the 
  plains 
  of 
  Mitidja 
  and 
  the 
  Sahel 
  of 
  Algiers. 
  Their 
  mass 
  at 
  certain 
  

   points 
  intercepted 
  the 
  light 
  of 
  the 
  sun, 
  and 
  produced 
  an 
  effect 
  similar 
  

   to 
  that 
  of 
  the 
  snow-storms 
  which 
  in 
  the 
  winter 
  season 
  fall 
  in 
  Europe 
  and 
  

   blot 
  out 
  even 
  the 
  nearest 
  objects 
  from 
  the 
  sight. 
  They 
  deposited 
  eggs 
  

   which 
  soon 
  gave 
  life 
  to 
  innumerable 
  larva3, 
  so 
  that 
  the 
  first 
  swarms 
  were 
  

   soon 
  replaced 
  and 
  centupled 
  by 
  new 
  generations. 
  They 
  not 
  only 
  de- 
  

   stroyed 
  all 
  vegetation, 
  but 
  filled 
  up 
  the 
  water-courses, 
  the 
  canals, 
  and 
  

   the 
  rivulets, 
  so 
  that 
  the 
  troops 
  had 
  the 
  greatest 
  difficulty 
  in 
  preserving 
  

   the 
  water 
  from 
  infection. 
  Almost 
  at 
  the 
  same 
  time 
  the 
  provinces 
  of 
  

   Oran 
  and 
  Oonstantine 
  were 
  invaded 
  at 
  Heman, 
  where 
  no 
  locusts 
  had 
  

   appeared 
  within 
  the 
  memory 
  of 
  the 
  oldest 
  inhabitants. 
  At 
  Sidi-bel- 
  

   Abbis, 
  at 
  Sidi-Brahim, 
  and 
  at 
  Mostaganen 
  they 
  attacked 
  not 
  only 
  the 
  

   tobacco 
  plantations, 
  the 
  vines, 
  and 
  the 
  fig 
  trees, 
  but 
  also 
  the 
  olive 
  trees, 
  

   notwithstanding 
  the 
  bitterness 
  of 
  their 
  leaves. 
  At 
  Eelizabe 
  and 
  at 
  

   Harba 
  they 
  invaded 
  the 
  cotton 
  grounds. 
  In 
  the 
  province 
  of 
  Oonstantine 
  

   the 
  locusts 
  appeared 
  simultaneously 
  from 
  the 
  Sahara 
  to 
  the 
  sea, 
  and 
  from 
  

   Bongie 
  to 
  Calle 
  118 
  . 
  

  

  M. 
  Girard 
  119 
  gives 
  a 
  very 
  interesting 
  account 
  of 
  this 
  invasion, 
  in 
  which 
  

   he 
  says 
  the 
  opinion 
  most 
  generally 
  accredited 
  in 
  reference 
  to 
  Acridians 
  

   (locusts) 
  of 
  Algiers 
  is 
  that 
  they 
  come 
  from 
  the 
  equatorial 
  regions 
  of 
  

   Africa, 
  from 
  Soudan. 
  That 
  the 
  swarms 
  hatching 
  in 
  the 
  sands 
  of 
  these 
  

   regions 
  — 
  a 
  part 
  of 
  which 
  move 
  to 
  the 
  south, 
  the 
  others 
  to 
  the 
  north 
  — 
  

   those 
  moving 
  northward 
  arrive 
  by 
  steps 
  in 
  the 
  Tell 
  of 
  Algiers. 
  The 
  

   specimens 
  of 
  this 
  swarm 
  which 
  were 
  sent 
  to 
  the 
  society, 
  in 
  all 
  stages 
  

   of 
  growth, 
  when 
  examined 
  proved 
  to 
  be 
  A. 
  perigrinum. 
  

  

  Reference 
  to 
  the 
  species 
  which 
  is 
  found 
  migratory 
  in 
  Algiers 
  and 
  

   other 
  parts 
  of 
  Africa, 
  and 
  its 
  specific 
  characteristics, 
  will 
  be 
  found 
  in 
  

   various 
  works. 
  120 
  

  

  The 
  most 
  complete 
  account 
  of 
  the 
  natural 
  history 
  and 
  ravages 
  of 
  this 
  

   species 
  in 
  Algiers 
  is 
  by 
  M. 
  G. 
  Lallemant. 
  121 
  He 
  says 
  the 
  two 
  great 
  in- 
  

   vasions, 
  that 
  of 
  1864 
  and 
  of 
  1866, 
  arrived 
  in 
  the 
  month 
  of 
  April. 
  That 
  

   these 
  insects 
  inhabit 
  all 
  the 
  North 
  of 
  Africa, 
  and 
  a 
  part 
  of 
  Asia; 
  that 
  

  

  "'Booth's 
  Trans., 
  i, 
  189. 
  

  

  «8 
  Trans. 
  Ent. 
  Soc, 
  Lond., 
  1866, 
  vol. 
  v, 
  Proc, 
  xxiii. 
  

  

  ii» 
  In 
  Ann. 
  Soc. 
  Ent. 
  Franco, 
  4th 
  Ser., 
  1864, 
  vii, 
  Bull., 
  x-xiii. 
  

  

  ™Oliveer, 
  " 
  Voyage 
  dans 
  Temp., 
  Othom."ii., 
  p. 
  424.— 
  ServilU, 
  "Orthop." 
  666.— 
  Shaw, 
  " 
  Travels 
  in 
  Bar- 
  

   bary 
  and 
  the 
  Levant."— 
  Poiret, 
  Voyage 
  en 
  Barbarie, 
  i, 
  306. 
  — 
  Compte-Eendu, 
  Acad, 
  des 
  Sci., 
  1845, 
  pp. 
  1041 
  

   and 
  1499.— 
  Lucas, 
  "Explor. 
  Scient. 
  Alg.," 
  in 
  Scien. 
  Phys. 
  Anim., 
  art. 
  iii, 
  29, 
  and 
  Bull. 
  Soc. 
  Ent. 
  France, 
  

   1845, 
  xxxii. 
  

  

  "»In 
  Ann. 
  Soc. 
  Ent. 
  Big., 
  voL 
  9. 
  

  

  