﻿Part 
  II 
  — 
  Systematic 
  List. 
  

  

  Order 
  THYSANURA. 
  

  

  This 
  order 
  contains 
  the 
  "spring-tails" 
  and 
  "bristle-tails," 
  which 
  are 
  

   small 
  or 
  minute, 
  soft-bodied 
  creatures 
  without 
  wings 
  and 
  no 
  obvious 
  

   transformations. 
  The 
  mouth 
  parts 
  are 
  feebly 
  developed, 
  without 
  obvious 
  

   mandibles, 
  and 
  they 
  are, 
  as 
  a 
  rule, 
  feeders 
  upon 
  the 
  products 
  of 
  decay, 
  

   though 
  some 
  of 
  the 
  larger 
  forms 
  are 
  able 
  to 
  attack 
  dry 
  and 
  hard 
  sub- 
  

   stances 
  by 
  scraping 
  lue 
  surface. 
  They 
  are 
  

   among 
  the 
  most 
  primitive 
  of 
  existing 
  insects, 
  

   a 
  few 
  of 
  them 
  closely 
  resembling 
  the 
  early 
  

   stages 
  of 
  "Myriapods," 
  while 
  in 
  others 
  the 
  

   tracheal 
  system 
  is 
  so 
  feebly 
  developed 
  that 
  

   respiration 
  seems 
  a 
  function 
  of 
  the 
  entire 
  

   skin 
  surface. 
  Such 
  insects 
  can 
  live 
  in 
  moist 
  

   places 
  only, 
  and 
  die 
  as 
  soon 
  as 
  they 
  are 
  ex- 
  

   posed 
  to 
  drying 
  out. 
  

  

  In 
  this 
  order 
  Mr. 
  R. 
  P. 
  Dow 
  has 
  kindly 
  fur- 
  

   nished 
  the 
  list, 
  including 
  such 
  species 
  as 
  are 
  

   so 
  generally 
  distributed 
  that 
  their 
  occur- 
  

   rence 
  in 
  New 
  Jersey 
  is 
  practically 
  certain. 
  

   There 
  have 
  been 
  no 
  actual 
  collections. 
  

  

  Sub=order 
  CINURA. 
  

  

  The 
  long 
  anal 
  appendages 
  which 
  give 
  

   these 
  insects 
  the 
  name 
  "bristle 
  tails" 
  are 
  

   many-jointed 
  and 
  extend 
  straight 
  out. 
  

   None 
  of 
  the 
  species 
  are 
  jumpers. 
  

  

  LEPISMA 
  Linn. 
  

  

  L. 
  saccharina 
  Linn. 
  Occurs 
  in 
  households 
  

   all 
  over 
  the 
  world 
  and 
  generally 
  in 
  eel 
  

   lars 
  or 
  damp 
  places. 
  Is 
  fond 
  of 
  moist 
  

   sugar, 
  and 
  will 
  feed 
  also 
  on 
  starchy 
  

   materials. 
  

  

  L. 
  quadriseriata 
  Pack. 
  Similar 
  in 
  habit 
  to 
  

   the 
  preceding, 
  but 
  a 
  native 
  insect, 
  more 
  

   common 
  southwardly. 
  

  

  -Silver-fish, 
  Lepisma 
  sp. 
  

   very 
  much 
  enlarged. 
  

  

  3 
  IN 
  

  

  (33) 
  

  

  