﻿562 
  Transactions 
  South 
  African 
  Philosophical 
  Society, 
  [vol. 
  xii. 
  

  

  the 
  base 
  to 
  a 
  third 
  of 
  the 
  length, 
  emarginate 
  there 
  and 
  slightly 
  

   attenuate 
  towards 
  the 
  apex 
  where 
  it 
  is 
  very 
  deeply 
  sinuate 
  in 
  the 
  

   outer 
  angles, 
  and 
  bi-lobate 
  at 
  the 
  apex 
  ; 
  it 
  is 
  not 
  very 
  convex 
  in 
  the 
  

   median 
  part, 
  but 
  is 
  deeply 
  impressed 
  at 
  apex 
  ; 
  maxillae 
  with 
  the 
  upper 
  

   lobe 
  armed 
  with 
  two 
  sharp 
  teeth 
  bent 
  at 
  right 
  angles, 
  the 
  upper 
  of 
  

   which 
  is 
  a 
  little 
  concave 
  and 
  placed 
  above 
  the 
  second 
  one 
  which 
  is 
  not 
  

   hollowed 
  and 
  is 
  set 
  on 
  the 
  inner 
  margin 
  and 
  a 
  little 
  below 
  the 
  first, 
  

   and 
  below 
  these 
  the 
  inner 
  lobe 
  is 
  produced 
  into 
  a 
  trifid, 
  transverse 
  

   tooth 
  ; 
  palpi 
  and 
  mandibles 
  as 
  in 
  Rhizoplatys, 
  but 
  the 
  mandibles 
  are 
  

   more 
  aculeate 
  and 
  produced 
  at 
  apex 
  into 
  a 
  triangular 
  reflexed 
  tooth. 
  

  

  Ehizoplatodes 
  castaneipennis, 
  Bohem., 
  

   Insect. 
  Caffrar., 
  ii., 
  p. 
  27. 
  

  

  Rhizoplatys 
  ambiguus, 
  Gerst., 
  Deck. 
  Eeis., 
  p. 
  873, 
  p. 
  105, 
  pi. 
  vii., 
  

   fig- 
  2. 
  

  

  Head 
  and 
  prothorax 
  piceous 
  black 
  ; 
  elytra 
  either 
  piceous 
  black 
  or 
  

  

  chestnut-brown, 
  legs 
  piceous 
  red 
  ; 
  head 
  very 
  rugose 
  ; 
  clypeus 
  very 
  

  

  obliquely 
  attenuate 
  laterally, 
  and 
  with 
  the 
  apical 
  part 
  triangular 
  and 
  

  

  reflexed 
  ; 
  in 
  the 
  male 
  the 
  posterior 
  part 
  of 
  the 
  head 
  is 
  deeply 
  

  

  excavate 
  in 
  the 
  middle, 
  and 
  there 
  is, 
  close 
  to 
  the 
  apex 
  of 
  the 
  

  

  clypeus, 
  a 
  conspicuous, 
  vertical 
  tooth, 
  hooked 
  backwards 
  at 
  tip 
  

  

  and 
  about 
  2 
  mm. 
  long 
  ; 
  in 
  the 
  female 
  there 
  is 
  a 
  similar 
  impression, 
  

  

  but 
  much 
  more 
  shallow, 
  the 
  dentate 
  apex 
  of 
  the 
  clypeus 
  is 
  prolonged 
  

  

  towards 
  the 
  median 
  part 
  in 
  a 
  short, 
  high 
  carina, 
  connected 
  often 
  

  

  with 
  a 
  sharp 
  tubercle 
  situated 
  in 
  the 
  centre 
  of 
  the 
  head 
  ; 
  prothorax 
  

  

  briefly 
  retuse 
  in 
  front 
  in 
  the 
  male, 
  the 
  retuse 
  part 
  being 
  divided 
  

  

  nearly 
  into 
  two 
  by 
  a 
  triangular, 
  narrow 
  longitudinal 
  impression 
  

  

  which 
  is 
  continued 
  as 
  a 
  deep 
  furrow 
  along 
  the 
  discoidal 
  part 
  as 
  

  

  far 
  as 
  the 
  base 
  ; 
  in 
  the 
  female 
  the 
  anterior 
  part 
  is 
  not 
  retuse, 
  and 
  

  

  the 
  impression 
  is 
  more 
  in 
  the 
  shape 
  of 
  a 
  groove, 
  also 
  continued 
  as 
  

  

  far 
  as 
  the 
  base 
  ; 
  in 
  both 
  sexes 
  the 
  surface 
  is 
  covered 
  with 
  round 
  

  

  punctures 
  a 
  little 
  remote 
  in 
  the 
  posterior 
  part 
  and 
  denser 
  and 
  a 
  little 
  

  

  deeper 
  in 
  the 
  anterior 
  and 
  lateral 
  parts 
  ; 
  scutellum 
  punctate 
  in 
  the 
  

  

  base 
  and 
  centre 
  ; 
  elytra 
  elongate, 
  somewhat 
  plane, 
  nearly 
  parallel, 
  

  

  declivous 
  at 
  apex, 
  covered 
  with 
  shallow, 
  slightly 
  cicatricose 
  

  

  punctures 
  closely 
  set, 
  and 
  with 
  the 
  striae 
  obliterated 
  ; 
  pygidium 
  

  

  moderately 
  closely 
  punctate 
  in 
  the 
  male, 
  rugose 
  in 
  the 
  female 
  ; 
  

  

  abdominal 
  segments 
  with 
  one 
  median 
  row 
  of 
  setigerous 
  punctures, 
  

  

  but 
  the 
  apical 
  one 
  is 
  smooth 
  in 
  the 
  centre 
  in 
  the 
  male 
  ; 
  this 
  segment 
  

  

  is 
  very 
  rugose, 
  and 
  the 
  others 
  closely 
  punctured, 
  as 
  well 
  as 
  having 
  

  

  