﻿698 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  ECTODESMUS, 
  new 
  genus. 
  

  

  Body 
  ratlier 
  robust, 
  at 
  least 
  more 
  so 
  than 
  the 
  other 
  African 
  genera 
  

   of 
  this 
  family; 
  not 
  constricted 
  ceplialad. 
  

  

  Carinae 
  very 
  small, 
  like 
  those 
  of 
  iScolodesmus, 
  rudimentary 
  and 
  obso- 
  

   lete 
  caudad. 
  

  

  Sterna 
  of 
  the 
  posterior 
  legs 
  of 
  each 
  segment 
  armed 
  with 
  distinct 
  

   conic 
  spines; 
  sternum 
  ot 
  fourth 
  legs 
  with 
  a 
  large, 
  subentire, 
  hirsute 
  

   process; 
  sternum 
  of 
  sixth 
  legs 
  with 
  a 
  distinct 
  rounded-conic, 
  hirsute 
  

   median 
  process. 
  

  

  Legs 
  very 
  long 
  and 
  slender; 
  anterior 
  legs 
  of 
  male 
  with 
  cushions 
  of 
  

   dense 
  hairs; 
  third 
  joint 
  unmodified. 
  

  

  Copulatory 
  legs 
  broad 
  and 
  thick 
  near 
  the 
  middle, 
  and 
  dentate 
  mesad; 
  

   distally 
  they 
  are 
  i)roduced 
  into 
  a 
  gradually 
  attenuate, 
  deeply 
  divided 
  

   armature, 
  which 
  extends 
  at 
  first 
  mesad 
  and 
  lies 
  in 
  contact 
  with 
  the 
  

   base 
  of 
  its 
  fellow; 
  it 
  is 
  then 
  bent 
  downward 
  (caudad) 
  and 
  turned 
  

   laterad, 
  so 
  that 
  the 
  two-pronged 
  apex 
  of 
  the 
  armature 
  lies 
  near 
  its 
  base. 
  

  

  Uctodesmus 
  agrees 
  with 
  kScolodesmus 
  in 
  habit, 
  rudimentary 
  carinae, 
  

   slender 
  legs 
  and 
  antennae, 
  and 
  color 
  pattern. 
  It 
  differs 
  in 
  having 
  the 
  

   body 
  more 
  robust, 
  the 
  i^rocess 
  of 
  the 
  sternum 
  of 
  the 
  fourth 
  pair 
  of 
  legs 
  

   more 
  prominent, 
  thinner 
  and 
  entire, 
  in 
  the 
  possession 
  of 
  a 
  distinct 
  

   rounded 
  process 
  from 
  the 
  sternum 
  of 
  the 
  sixth 
  pair 
  of 
  legs, 
  in 
  having 
  

   the 
  ventral 
  face 
  of 
  the 
  second 
  and 
  third 
  joints 
  of 
  anterior 
  legs 
  mem- 
  

   braneous 
  or 
  fleshy, 
  in 
  being 
  provided 
  with 
  a 
  pad 
  of 
  densely 
  crowded 
  

   hairs 
  on 
  the 
  two 
  distal 
  joints 
  of 
  the 
  anterior 
  male 
  legs, 
  and 
  finally 
  it 
  is 
  

   distinguishable 
  from 
  all 
  known 
  African 
  Strongylosomatidae 
  in 
  that 
  

   the 
  copulatory 
  legs 
  are 
  distally 
  turned 
  laterad. 
  

  

  ECTODESMUS 
  EXTORTUS, 
  new 
  species. 
  

  

  Head 
  slightly 
  narrower 
  than 
  first 
  segment; 
  sulcus 
  rather 
  shallow; 
  

   clypeus 
  smooth, 
  sparsely 
  hirsute. 
  

  

  First 
  segment 
  oblong, 
  the 
  corners 
  rounded 
  and 
  the 
  interior 
  margin 
  

   slightly 
  curved 
  laterad. 
  

  

  Second 
  and 
  third 
  segments 
  equal 
  in 
  width 
  to 
  the 
  first 
  and 
  fourth, 
  

   there 
  being 
  no 
  trace 
  of 
  the 
  neck-like 
  constriction 
  which 
  appears 
  in 
  

   Scolodesmus 
  ; 
  the 
  second 
  segment 
  has 
  the 
  carinae 
  very 
  distinct 
  and 
  

   extended 
  obliquely 
  cephalad 
  on 
  a 
  large 
  triangular 
  process. 
  

  

  Segments 
  dorsally 
  smooth, 
  but 
  not 
  shining, 
  a 
  distinct 
  transverse 
  sul- 
  

   cus 
  on 
  the 
  fifth 
  and 
  following 
  segments 
  to 
  the 
  eighteenth. 
  

  

  Carinae 
  of 
  anterior 
  poriferous 
  segments 
  consisting 
  of 
  a 
  slight 
  sub- 
  

   triangular 
  prominence, 
  those 
  of 
  poreless 
  segments 
  scarcely 
  defined, 
  

   except 
  by 
  the 
  superior 
  impressed 
  line; 
  on 
  posterior 
  segments 
  the 
  carinae 
  

   are 
  obsolete, 
  even 
  the 
  impressed 
  line 
  being 
  deficient. 
  The 
  pores 
  are 
  

   rather 
  large 
  and 
  are 
  surrounded 
  by 
  a 
  fine 
  ring. 
  

  

  Transverse 
  sulcus 
  rather 
  deep, 
  not 
  crenulate. 
  

  

  Last 
  segment 
  with 
  the 
  ai^ex 
  rather 
  broad 
  and 
  rounded 
  ; 
  between 
  the 
  

   four 
  setiferous 
  puuctatious 
  is 
  a 
  small 
  denticule. 
  

  

  