﻿34 
  REPORT 
  OF 
  NEW 
  JERSEY 
  STATE 
  MUSEUM. 
  

  

  THERMOBIA 
  Bergr. 
  

  

  T. 
  domestica 
  Pack. 
  The 
  common 
  "silver-fish" 
  or 
  "fish 
  moth" 
  f6und 
  every- 
  

   where 
  in 
  houses, 
  and 
  usually 
  in 
  dry 
  places 
  around 
  kitchen 
  stoves, 
  in 
  

   pantries, 
  and 
  even 
  in 
  dusty 
  drawers. 
  Feeds 
  on 
  starchy 
  material, 
  

   and 
  sometimes 
  gnaws 
  the 
  bindings 
  of 
  books. 
  All 
  these 
  species 
  are 
  

   economically 
  harmless. 
  

  

  SCOLOPENDRELLA 
  Gerv. 
  

  

  S. 
  gratiae 
  Ryder. 
  In 
  damp 
  places, 
  under 
  leaves 
  and 
  mold; 
  resembles 
  

   a 
  minute 
  larval 
  centipede. 
  

  

  C. 
  americana 
  Pack. 
  

  

  leaves. 
  

  

  CAMPODEA 
  Westw. 
  

  

  Common 
  everywhere 
  in 
  woods, 
  under 
  stones 
  and 
  

  

  MACHILIS 
  Latr. 
  

   M. 
  variabilis 
  Say. 
  Generally 
  distributed 
  in 
  the 
  Atlantic 
  States. 
  

  

  Sub^order 
  COLLEMBOLA. 
  

  

  Much 
  more 
  abundant 
  in 
  species 
  and 
  specimens, 
  and 
  all 
  small 
  or 
  very 
  

   small. 
  They 
  are 
  distinguished 
  by 
  a 
  pair 
  of 
  short 
  anal 
  spines 
  or 
  "furcula," 
  

   which 
  are 
  turned 
  under 
  the 
  body 
  and 
  form 
  a 
  spring 
  or 
  leaping 
  organ, 
  

   which 
  gives 
  them 
  the 
  common 
  name 
  "spring-tails." 
  Most 
  of 
  the 
  species 
  

   are 
  feeders 
  on 
  vegetable 
  decay, 
  and 
  they 
  occur 
  literally 
  in 
  thousands 
  on 
  

   manure 
  beds, 
  in 
  toad-stools, 
  on 
  stored 
  fermenting 
  vegetables, 
  in 
  cellars 
  

   and 
  generally 
  in 
  damp 
  places. 
  A 
  few 
  species 
  occur 
  on 
  living, 
  healthy 
  

   plants, 
  but 
  not 
  in 
  such 
  a 
  way 
  as 
  to 
  prove 
  injurious. 
  The 
  insects 
  are 
  very 
  

   light, 
  and 
  after 
  a 
  heavy 
  rain 
  thousands 
  may 
  be 
  seen 
  hopping 
  about 
  on 
  

   the 
  surface 
  of 
  the 
  pools 
  formed 
  in 
  low 
  meadows. 
  I 
  have 
  seen 
  millions 
  

   on 
  the 
  water 
  covering 
  a 
  cranberry 
  bog 
  refiowed 
  late 
  in 
  May 
  or 
  early 
  June. 
  

  

  SMYNTHURUS 
  Latr. 
  

  

  S. 
  arvalis 
  Fitch. 
  This 
  and 
  the 
  four 
  next 
  following 
  

   species 
  are 
  found 
  on 
  garden 
  plants 
  and 
  are 
  locally 
  

   common. 
  

  

  S. 
  elegans 
  Fitch. 
  With 
  the 
  preceding. 
  

  

  S. 
  hortensis 
  Fitch. 
  Common 
  on 
  grasses. 
  

  

  S. 
  quadrimaculatus 
  Ryder. 
  Locally 
  common. 
  

  

  S. 
  ciavatus 
  Banks. 
  Under 
  rotten 
  bark, 
  Sea 
  Cliff, 
  Long 
  

   Island. 
  

  

  S. 
  macgillivrayi 
  Banks. 
  Long 
  Island, 
  on 
  weeds, 
  in 
  May. 
  

  

  Fig. 
  2. 
  — 
  Podurid 
  

   with 
  spring 
  

   extended. 
  

  

  