﻿224 
  REPORT 
  OF 
  NEW 
  JERSEY 
  STATE 
  MUSEUM. 
  

  

  G. 
  affinis 
  Aube. 
  Anglesea 
  (Rob); 
  Staten 
  Island 
  (Coll); 
  "New 
  Jersey" 
  

  

  (U 
  M). 
  

   G. 
  pernitidus 
  Lee. 
  Lakehurst 
  (Rob). 
  

   G. 
  analis 
  Say. 
  Spring 
  Lake 
  (Ch) 
  ; 
  Hammonton 
  VIII 
  (Dke) 
  ; 
  Atlantic 
  Co. 
  

  

  (div); 
  Lahaway 
  V, 
  28, 
  (Coll); 
  Clementon 
  VII, 
  26, 
  Atco 
  IX, 
  2, 
  27 
  

  

  (GG). 
  

   G. 
  marinus 
  Gyll. 
  Anglesea 
  (Rob). 
  

   G. 
  opacus 
  Sahib. 
  Spotswood 
  (Rob). 
  

   G. 
  gibber 
  Lee. 
  Spotswood 
  (Rob). 
  

   G. 
  borealis 
  Aube. 
  Madison 
  (Pr) 
  ; 
  Hammonton 
  VIII 
  (Dke); 
  Atlantic 
  Co. 
  

  

  (div); 
  Lahaway 
  V, 
  28, 
  Jamesburg 
  (Coll). 
  

   G. 
  lugens 
  Lee. 
  Boonton 
  VI, 
  12 
  <GG) 
  ; 
  Spotswood 
  (Rob); 
  Atco 
  (Li). 
  

   G. 
  picipes 
  Aube. 
  Spotswood, 
  Lakehurst 
  (Rob); 
  Atco 
  IX, 
  27 
  (GG). 
  

  

  DINEUTES 
  MacL. 
  

  

  D. 
  vittatus 
  Germ. 
  New 
  Brunswick 
  and 
  southward 
  April 
  to 
  midsummer, 
  

  

  everywhere, 
  singly 
  in 
  ditches 
  and 
  small 
  streams; 
  never 
  in 
  ponds. 
  

   D. 
  emarginatus 
  Say. 
  Westville 
  (Rob); 
  DaCosta, 
  Jamesburg 
  VIII, 
  24 
  

  

  (Coll); 
  Merchantville 
  VI, 
  5, 
  Clementon 
  VII, 
  26 
  (GG). 
  

   D. 
  hornii 
  Rob. 
  Budd's 
  Lake 
  IX, 
  3 
  (Coll); 
  Boonton 
  V, 
  19 
  (GG) 
  ; 
  New 
  

  

  Brunswick 
  (Rob); 
  Westville 
  (Dke); 
  Staten 
  Island 
  VIII, 
  16 
  (Ds). 
  

   D. 
  nigrior 
  Rob. 
  Budd's 
  Lake 
  IX, 
  3, 
  Newark, 
  New 
  Brunswick, 
  Lahaway 
  

  

  (Coll); 
  Spotswood, 
  Lakehurst 
  (Rob); 
  Boonton 
  V, 
  17, 
  Woodbury 
  VI, 
  

  

  8, 
  Clementon 
  VII, 
  26 
  (GG). 
  

   D. 
  assimilis 
  Aube. 
  Common 
  throughout 
  the 
  State 
  nearly 
  all 
  summer. 
  

   D. 
  discolor 
  Aube. 
  With 
  the 
  preceding 
  and 
  equally 
  abundant. 
  

   D. 
  carol 
  inus 
  Lee. 
  Hammonton 
  VIII 
  (Dke). 
  

  

  Family 
  HYDROPHIUD^. 
  

  

  These 
  are 
  the 
  "water 
  scavengers," 
  usually 
  black 
  in 
  color, 
  sometimes 
  

   with 
  yellow, 
  orange 
  or 
  red 
  markings 
  along 
  the 
  margins, 
  usually 
  smooth, 
  

   polished 
  and 
  very 
  convex 
  above, 
  flattened 
  below. 
  The 
  antennae 
  are 
  short 
  

   and 
  clubbed 
  or 
  enlarged 
  at 
  tip; 
  hence 
  the 
  species 
  are 
  easily 
  distinguish- 
  

   able 
  from 
  the 
  divers, 
  which 
  have 
  them 
  filiform 
  or 
  thread-like. 
  A 
  number 
  

   of 
  the 
  smaller 
  species 
  are 
  different 
  in 
  form 
  and 
  have 
  the 
  surface 
  rough 
  or 
  

   pitted; 
  these 
  crawl 
  rather 
  than 
  swim 
  on 
  the 
  soil 
  and 
  vegetation 
  under 
  

   water. 
  Finally 
  there 
  are 
  yet 
  other 
  species 
  structurally 
  like 
  those 
  inhab- 
  

   iting 
  the 
  water, 
  that 
  live 
  in 
  moist 
  earth, 
  dung 
  and 
  decaying 
  or 
  fermenting 
  

   vegetation. 
  They 
  are 
  of 
  no 
  economic 
  importance. 
  As 
  in 
  the 
  other 
  water 
  

   beetles, 
  Mr. 
  Roberts 
  has 
  helped 
  out 
  in 
  this 
  family. 
  

  

  HELOPHORUS 
  Fab. 
  

   H. 
  iacustris 
  Lee. 
  Locally 
  common 
  throughout 
  the 
  State 
  all 
  season. 
  

   H. 
  lineatus 
  Say. 
  Madison 
  (Pr) 
  ; 
  Ft. 
  Lee 
  V 
  (Bt) 
  ; 
  Newark 
  (Soc); 
  Wood- 
  

  

  