﻿400 
  REPORT 
  OF 
  NEW 
  JERSEY 
  STATE 
  MUSEUM. 
  

  

  Family 
  SCOLYTID.E. 
  

  

  Commonly 
  known 
  as 
  "bark 
  beetles." 
  They 
  are 
  usually 
  cylindrical, 
  or 
  

   nearly 
  so, 
  often 
  with 
  the 
  end 
  of 
  the 
  elytra 
  truncate 
  or 
  armed 
  with 
  teeth 
  

   in 
  the 
  male; 
  the 
  head 
  bent 
  down, 
  often 
  retracted 
  and 
  overshadowed 
  by 
  

   the 
  prothorax, 
  which 
  may 
  be 
  roughened 
  or 
  rugose, 
  and 
  the 
  mouth 
  parts 
  

   forming 
  none 
  or 
  only 
  a 
  very 
  short 
  snout. 
  The 
  legs 
  are 
  generally 
  short, 
  

   often 
  broad 
  and 
  somewhat 
  flattened, 
  capable 
  of 
  being 
  very 
  closely 
  folded 
  

   to 
  the 
  body. 
  They 
  are 
  all 
  borers 
  in 
  bark, 
  bast 
  or 
  heart-wood, 
  and 
  almost 
  

   every 
  species 
  is 
  as 
  well 
  characterized 
  by 
  its 
  work 
  as 
  by 
  its 
  structure. 
  

   In 
  the 
  common 
  type 
  of 
  which 
  the 
  "fruit 
  bark 
  beetle" 
  is 
  an 
  example, 
  the 
  

   adult 
  beetle 
  makes 
  a 
  central 
  gallery 
  on 
  each 
  side 
  of 
  which 
  eggs 
  are 
  laid 
  in 
  

   little 
  recesses. 
  From 
  these 
  eggs 
  hatch 
  grub-like 
  larvae, 
  which 
  bore 
  between 
  

   bark 
  and 
  wood, 
  diverging 
  as 
  they 
  increase 
  in 
  size. 
  When 
  these 
  larvae 
  

   are 
  full 
  grown 
  they 
  pupate 
  at 
  the 
  end 
  of 
  the 
  boring, 
  and 
  in 
  due 
  time 
  the 
  

   adult 
  emerges 
  through 
  a 
  little 
  round 
  hole. 
  Species 
  of 
  this 
  type 
  usually 
  

   attack 
  trees 
  not 
  quite 
  healthy 
  or 
  badly 
  injured, 
  and 
  when 
  once 
  they 
  have 
  

   secured 
  a 
  footing 
  in 
  an 
  orchard 
  tree 
  it 
  might 
  as 
  well 
  be 
  cut 
  out 
  and 
  

   burned. 
  

  

  Other 
  species 
  bore 
  into 
  the 
  solid 
  wood, 
  and 
  as 
  readily 
  Into 
  healthy 
  as 
  

   sickly 
  trees. 
  Here 
  the 
  galleries 
  are 
  often 
  blackened 
  and 
  serve 
  for 
  the 
  

   propagation 
  of 
  "Ambrosia," 
  a 
  peculiar 
  fungus 
  upon 
  which 
  both 
  larvae 
  and 
  

   adult 
  beetles 
  feed. 
  Some 
  of 
  these 
  forms 
  are 
  of 
  extreme 
  interest, 
  and 
  

   their 
  injury 
  is 
  not 
  only 
  direct 
  as 
  affecting 
  the 
  life 
  of 
  the 
  tree, 
  but 
  indirect 
  

   as 
  affecting 
  the 
  value 
  of 
  the 
  wood 
  for 
  timber. 
  

  

  The 
  classification 
  of 
  the 
  family 
  is 
  in 
  an 
  unsatisfactory 
  condition 
  at 
  

   present. 
  There 
  are 
  many 
  undescribed 
  species 
  and 
  many 
  that 
  are 
  undeter- 
  

   mined 
  in 
  collections. 
  Dr. 
  A. 
  D. 
  Hopkins, 
  of 
  the 
  U. 
  S. 
  Department 
  of 
  Agri- 
  

   culture, 
  has 
  been 
  studying 
  the 
  group 
  for 
  some 
  years, 
  but 
  has 
  not 
  yet 
  pub- 
  

   lished 
  the 
  results 
  of 
  his 
  labors 
  except 
  in 
  "Dendroctonus." 
  The 
  present 
  

   list, 
  therefore, 
  merely 
  adds 
  a 
  few 
  species, 
  some 
  new 
  localities 
  and 
  a 
  little 
  

   additional 
  information 
  concerning 
  food 
  habits. 
  

  

  PLATYPUS 
  Hbst. 
  

  

  P. 
  flavicornis 
  Fab. 
  Sea 
  Isle 
  VII, 
  4 
  (Brn); 
  Anglesea 
  V, 
  21 
  (div). 
  

  

  CORTHYLUS 
  Er. 
  

  

  C. 
  punctatissimus 
  Zimm. 
  Eagle 
  Rock 
  (Bf) 
  ; 
  Staten 
  Island 
  (Lg) 
  ; 
  Cape 
  

   May 
  C. 
  H. 
  X, 
  22, 
  cut 
  out 
  of 
  roots 
  of 
  huckleberry, 
  readily 
  noted 
  by 
  

   yellow 
  dust 
  on 
  surface 
  of 
  ground 
  (W) 
  ; 
  boring 
  in 
  green 
  sassafras 
  

   (Hpk). 
  

  

  C. 
  columbianus 
  Hopk. 
  5-mile 
  beach, 
  cut 
  out 
  of 
  toad 
  stomachs 
  VII, 
  4; 
  

   bores 
  into 
  healthy 
  oak 
  and 
  other 
  hardwood 
  trees 
  (W). 
  

  

  