﻿Subfamily 
  of 
  Lamellicorn 
  Beetles. 
  611 
  

  

  from 
  Senegal 
  was 
  described 
  by 
  Fairmaire 
  as 
  Xanthelceus 
  

   pltcifirons 
  and 
  assigned 
  to 
  the 
  Dynastinae. 
  This 
  insect 
  I 
  

   have 
  found 
  to 
  be 
  undoubtedly 
  congeneric 
  with 
  the 
  Asiatic 
  

   species, 
  but, 
  although 
  the 
  external 
  aspect 
  of 
  the 
  insect, 
  and 
  

   especially 
  the 
  form 
  of 
  the 
  head, 
  with 
  its 
  transverse 
  ridges, 
  

   suggest 
  the 
  Dynastinse 
  more 
  than 
  any 
  of 
  the 
  Geotrupine 
  

   subfamilies, 
  this 
  is 
  an 
  illusion, 
  for 
  the 
  position 
  of 
  the 
  

   spiracles 
  between 
  the 
  abdominal 
  segments 
  and 
  the 
  thick 
  

   extruded 
  labium 
  dissipate 
  that 
  idea. 
  With 
  the 
  Coprinae 
  

   it 
  has 
  nothing 
  in 
  common 
  but 
  the 
  concealed 
  mandibles 
  

   and 
  labrum. 
  There 
  is 
  some 
  resemblance 
  to 
  yEgialia, 
  but 
  

   this 
  is 
  not 
  borne 
  out 
  by 
  a 
  careful 
  comparison 
  of 
  the 
  head 
  and 
  

   mouth-structure. 
  To 
  the 
  Ochodaeinae 
  there 
  is 
  little 
  resem- 
  

   blance, 
  except 
  in 
  the 
  peculiar 
  branched 
  tibial 
  spurs, 
  and 
  to 
  the 
  

   Orphninae 
  there 
  is 
  scarcely 
  more. 
  So 
  completely 
  character- 
  

   istic 
  of 
  these 
  groups 
  and 
  of 
  the 
  Hybosorinae 
  are 
  the 
  large 
  

   extruded 
  mandibles 
  and 
  labrum 
  and 
  short 
  flat 
  clypeus, 
  that 
  

   it 
  seems 
  equally 
  impossible 
  to 
  find 
  a 
  place 
  for 
  this 
  remarkable 
  

   form 
  in 
  any 
  of 
  them, 
  and 
  the 
  only 
  remaining 
  solution 
  of 
  the 
  

   problem 
  is 
  the 
  formation 
  of 
  a 
  new 
  subfamily, 
  Dynamopinse. 
  

   It 
  is 
  not 
  impossible 
  that 
  other 
  enigmatical 
  genera, 
  two 
  or 
  

   three 
  of 
  which 
  have 
  not 
  yet 
  been 
  carefully 
  studied, 
  may 
  

   eventually 
  find 
  their 
  proper 
  place 
  in 
  this 
  group. 
  

  

  The 
  distinctive 
  features 
  may 
  be 
  summarized 
  as 
  follows 
  : 
  — 
  

   The 
  body 
  is 
  very 
  compact 
  and 
  convex, 
  the 
  legs 
  short, 
  the 
  

   coxae 
  of 
  each 
  pair 
  contiguous, 
  the 
  femora 
  and 
  tibiae 
  very 
  

   massive, 
  and 
  the 
  tarsi 
  relatively 
  minute. 
  The 
  front 
  tibiae 
  are 
  

   strongly 
  curved 
  inwards, 
  the 
  outer 
  edge 
  forming 
  three 
  strong 
  

   blunt 
  lobes. 
  The 
  four 
  posterior 
  tibiae 
  are 
  greatly 
  dilated 
  at 
  

   the 
  ends 
  and 
  each 
  has 
  a 
  strong 
  transverse 
  outer 
  carina. 
  

   The 
  spur 
  of 
  the 
  front 
  tibia 
  is 
  flat 
  and 
  pectinate 
  along 
  its 
  

   inner 
  edge, 
  and 
  those 
  of 
  the 
  posterior 
  tibiae 
  are 
  laminar, 
  broad 
  

   at 
  the 
  end, 
  and 
  cleft 
  into 
  radiating 
  lobes, 
  two 
  or 
  three 
  in 
  

   number 
  in 
  the 
  inner 
  spur 
  and 
  eight 
  or 
  ten 
  in 
  the 
  outer 
  one. 
  

   The 
  basal 
  joint 
  of 
  the 
  tarsi 
  is 
  long 
  and 
  the 
  claws 
  are 
  very 
  

   small 
  and 
  slender. 
  The 
  antennae 
  are 
  10-jointed, 
  with 
  a 
  

   short 
  3-jointed 
  simple 
  and 
  compact 
  club. 
  The 
  eyes 
  are 
  

   moderately 
  large, 
  coarsely 
  facetted, 
  and 
  divided 
  by 
  a 
  canthus 
  

   in 
  front. 
  The 
  head 
  bears 
  two 
  sharp 
  transverse 
  carinae 
  above, 
  

   the 
  clypeus 
  is 
  produced 
  into 
  a 
  rather 
  sharp 
  point 
  in 
  the 
  

   middle, 
  and 
  the 
  genae 
  are 
  produced 
  into 
  a 
  pair 
  of 
  long, 
  nearly 
  

   parallel 
  processes, 
  curving 
  a 
  little 
  upwards, 
  pointed, 
  and 
  

   highly 
  chitinous. 
  

  

  The 
  labrum 
  is 
  protruded, 
  thick, 
  short, 
  and 
  broad, 
  studded 
  

   with 
  stiff 
  bristles 
  and 
  having 
  its 
  lateral 
  angles 
  prominent. 
  

   The 
  mandibles 
  are 
  very 
  short, 
  completely 
  hidden 
  within 
  the 
  

  

  