﻿2i8 
  REPORT 
  OF 
  NEW 
  JERSEY 
  STATE 
  MUSEUM. 
  

   Family 
  DYTISCID^. 
  

  

  These 
  are 
  the 
  "diving 
  beetles," 
  and 
  their 
  larvae 
  are 
  known 
  as 
  "water 
  

   tigers" 
  from 
  their 
  predatory 
  habits, 
  voracity 
  in 
  feeding 
  and 
  powerful 
  

   mandibles. 
  The 
  adults 
  are 
  also 
  predatory, 
  oval 
  and 
  somewhat 
  flattened, 
  

   with 
  rather 
  short, 
  stout 
  swimming 
  legs; 
  the 
  posterior 
  longest 
  and 
  oar- 
  

   Jike. 
  They 
  live 
  in 
  water 
  of 
  all 
  kinds 
  and 
  may 
  often 
  be 
  seen 
  in 
  clear 
  

   springs 
  rising 
  to 
  the 
  surface, 
  discharging 
  a 
  bubble 
  of 
  tainted 
  air 
  from 
  

   the 
  anal 
  extremity 
  and 
  then 
  swimming 
  again 
  to 
  the 
  bottom. 
  They 
  are 
  

   interesting 
  in 
  structure 
  and 
  habits, 
  but 
  not 
  of 
  economic 
  importance. 
  

  

  CANTHYDRUS 
  Sharp. 
  

  

  C. 
  puncticolMs 
  Cr. 
  Staten 
  Island 
  V, 
  20 
  (Lg) 
  ; 
  Ocean 
  Co. 
  (Rob); 
  Cape 
  

   May 
  C. 
  H. 
  (W). 
  

  

  C. 
  punctipennis 
  Sharp. 
  Linwood 
  (Rob); 
  Clementon 
  IV, 
  16, 
  Petersburg 
  

  

  V, 
  19 
  (Brn); 
  Anglesea 
  IV, 
  V 
  (Coll). 
  Mr. 
  Roberts 
  says 
  that 
  "C. 
  

   bicolor" 
  Say 
  does 
  not 
  occur 
  in 
  New 
  Jersey, 
  and 
  that 
  the 
  records 
  

   under 
  that 
  name 
  in 
  the 
  last 
  edition 
  refer 
  to 
  this 
  species. 
  

  

  HYDROCANTHUS 
  Say. 
  

  

  H. 
  iricolor 
  Say. 
  Recorded 
  from 
  Newark 
  to 
  the 
  Delaware, 
  and 
  south 
  to 
  

  

  Cape 
  May 
  V, 
  VIII, 
  IX; 
  taken 
  by 
  all 
  collectors. 
  

   H. 
  oblongus 
  Sharp. 
  Ocean 
  Co. 
  1 
  spec; 
  it 
  is 
  common 
  in 
  Florida 
  (Rob). 
  

  

  LACCOPHILUS 
  Leach. 
  

   L. 
  maculosus 
  Germ. 
  Common 
  throughout 
  the 
  State 
  in 
  early 
  spring 
  and 
  

  

  again 
  in 
  fall; 
  hibernates 
  as 
  an 
  adult. 
  

   L, 
  proximus 
  Say. 
  Ft. 
  Lee 
  (Bt) 
  ; 
  Monmouth 
  and 
  Ocean 
  Co. 
  (Rob); 
  De- 
  

   lair 
  (Coll); 
  Anglesea 
  V 
  (div). 
  

   , 
  L. 
  fasciatus 
  Aube. 
  Throughout 
  the 
  State 
  in 
  spring 
  and 
  fall; 
  common. 
  

   L. 
  undatus 
  Aube. 
  Summit 
  V, 
  1, 
  Paterson 
  IV-, 
  2, 
  Millburn 
  IV, 
  30, 
  West- 
  

   ville 
  VI, 
  11 
  (Coll) 
  ; 
  Madison 
  (Pr) 
  ; 
  Ft. 
  Lee 
  district 
  (Bt) 
  ; 
  Monmouth, 
  

   Ocean 
  Co. 
  (Rob); 
  Merchantville 
  IV, 
  24 
  (Brn). 
  

  

  HYDROVATUS 
  Mots. 
  

   H. 
  cuspidatus 
  Germ. 
  Ft. 
  Lee 
  district, 
  Staten 
  Island 
  (Bt) 
  ; 
  Camden 
  (Li); 
  

  

  Atco 
  V, 
  29, 
  Brigantine 
  VII, 
  25, 
  Anglesea 
  V, 
  28 
  (Brn); 
  in 
  stagnant 
  

  

  water. 
  

   H. 
  pustulatus 
  Mels. 
  Staten 
  Island 
  (Bt) 
  ; 
  Monmouth 
  and 
  Ocean 
  Cos. 
  

  

  (Rob); 
  New 
  Brunswick 
  VI, 
  11, 
  Anglesea 
  V, 
  28 
  (Coll). 
  

   H. 
  compressus 
  Sharp. 
  Anglesea 
  V, 
  28 
  (Coll). 
  

  

  DESMOPACHRIA 
  Bab. 
  

  

  D. 
  convexa 
  Aube. 
  Great 
  Piece 
  Meadows 
  V, 
  2. 
  VIII, 
  22, 
  Delair, 
  Anglesea 
  

  

  IV, 
  12 
  (Coll); 
  Madison 
  VII, 
  28 
  (Pr) 
  ; 
  Orange 
  VI, 
  5, 
  at 
  light 
  (Ch) 
  ; 
  

   Camden 
  (Li) 
  ; 
  in 
  stagnant 
  water. 
  

  

  