﻿6 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  G7 
  

  

  7. 
  Mentum 
  with 
  a 
  short 
  broad 
  tooth. 
  Gulai 
  sutures 
  strongly 
  angulate. 
  

  

  Color 
  uniform 
  piceous 
  or 
  black 
  Silphomorpha 
  Westwood. 
  

  

  Mentum 
  without 
  a 
  tooth. 
  Gular 
  sutures 
  not 
  angulate. 
  Elytra 
  maculate 
  

   or 
  vittate 
  or 
  with 
  broad 
  pale 
  margins 
  (metallic 
  green 
  in 
  speciosa 
  Pascoe). 
  

  

  Sphallomorpha 
  Westwood. 
  

  

  Genus 
  ADELOTOPUS 
  Hope 
  

  

  The 
  following 
  key 
  was 
  prepared 
  in 
  large 
  part 
  from 
  the 
  original 
  

   descriptions 
  only. 
  Such 
  species 
  as 
  could 
  not 
  be 
  identified 
  in 
  the 
  

   material 
  at 
  hand 
  are 
  marked 
  with 
  an 
  asterisk. 
  Specimens 
  of 
  Adelo- 
  

   topus 
  dytiscoides 
  Newman, 
  Adelotopus 
  ipsoides 
  Westwood, 
  and 
  

   Adelotopus 
  rubiginosus 
  Newman 
  which 
  had 
  been 
  compared 
  with 
  

   the 
  types 
  were 
  obtained 
  through 
  the 
  kindness 
  of 
  G. 
  J. 
  Arrow, 
  of 
  

   the 
  British 
  Museum, 
  who 
  also 
  compared 
  a 
  specimen 
  from 
  the 
  collec- 
  

   tion 
  of 
  the 
  American 
  Museum 
  of 
  Natural 
  History 
  with 
  the 
  type 
  of 
  

   Adelotopus 
  gyrinoides 
  Hope 
  and 
  identified 
  it 
  as 
  that 
  species. 
  

   Complete 
  descriptions 
  are 
  given 
  for 
  those 
  species 
  only, 
  believed 
  to> 
  

   be 
  undescribed. 
  

  

  KEY 
  TO 
  STECIES 
  OF 
  GENUS 
  ADLOTOPUS 
  HOPE 
  

  

  1. 
  Head 
  with 
  two 
  horn-like 
  tubercles 
  * 
  cornutus 
  Castelnau. 
  

  

  Head 
  without 
  tubercles 
  2 
  

  

  2. 
  Whole 
  upper 
  surface 
  setose, 
  with 
  pale 
  erect 
  hairs 
  * 
  analis 
  MacLeay. 
  

  

  Upper 
  surface 
  not 
  setose 
  3 
  

  

  3. 
  Head 
  with 
  intraorbital 
  setigerous 
  punctures 
  * 
  insignis 
  Sloane. 
  

  

  Head 
  without 
  intraorbital 
  setigerous 
  punctures 
  4 
  

  

  4. 
  Form 
  very 
  broad. 
  Thorax 
  three 
  times 
  as 
  broad 
  as 
  long. 
  Elytra 
  about 
  

  

  as 
  long 
  as 
  broad 
  * 
  celeripes 
  Lea. 
  

  

  Form 
  elongate. 
  Elytra 
  distinctly 
  to 
  strongly 
  elongate. 
  Thorax 
  not 
  more 
  

   than 
  twice 
  as 
  broad 
  as 
  long 
  5 
  

  

  5. 
  Elytra 
  unicolorous 
  or 
  nearly 
  so 
  6 
  

  

  Elytra 
  bicolored 
  ; 
  maculate, 
  fasciate 
  or 
  with 
  apex 
  rather 
  broadly 
  and 
  defi- 
  

   nitely 
  red 
  25 
  

  

  6. 
  Oolor 
  black 
  or 
  piceous 
  black 
  7 
  

  

  Color 
  pale 
  castaneous 
  or 
  brownish 
  19 
  

  

  7. 
  Elytra 
  with 
  punctation 
  extremely 
  minute 
  8 
  

  

  Elytra 
  distinctly 
  punctate. 
  Abdomen 
  red 
  18 
  

  

  8. 
  Elytra 
  with 
  the 
  minute 
  punctation 
  variolosa 
  Thorax 
  twice 
  as 
  wide 
  

  

  as 
  long 
  * 
  variolosus 
  Lea. 
  

  

  Elytral 
  punctation 
  not 
  variolose 
  9 
  

  

  9. 
  Thorax 
  with 
  all 
  the 
  angles 
  very 
  acute. 
  Form 
  elongate. 
  Elytra 
  three 
  

  

  times 
  the 
  length 
  of 
  the 
  thorax 
  * 
  elongatulusMacLeay. 
  

  

  Thorax 
  with 
  the 
  posterior 
  angles 
  much 
  less 
  distinct 
  10 
  

  

  10. 
  Abdomen 
  ferruginous 
  or 
  red 
  11 
  

  

  Abdomen 
  Mack 
  or 
  piceous 
  black 
  : 
  13 
  

  

  11. 
  Form 
  elongate, 
  narrower 
  * 
  tasmani 
  Blackburn 
  

  

  Form 
  broader 
  12 
  

  

  12. 
  Scutellum 
  and 
  margins 
  of 
  thorax 
  and 
  elytra 
  paler, 
  piceous. 
  

  

  * 
  scolytides 
  Newman. 
  

   Scntelluni 
  and 
  margins 
  of 
  thorax 
  and 
  elytra 
  not 
  paler. 
  

  

  hydrobioides 
  Westwood. 
  

  

  