﻿NO. 
  1971. 
  NEW 
  SPECIES 
  OF 
  CRABS— 
  BATHBVN. 
  617 
  

  

  Ambulatory 
  legs 
  rougher 
  than 
  usual, 
  the 
  merus 
  joints 
  very 
  wide 
  

   (that 
  of 
  last 
  paii- 
  twice 
  as 
  long 
  as 
  wide), 
  their 
  margins 
  strongly 
  serru- 
  

   late, 
  granules 
  of 
  dorsal 
  surface 
  coarse, 
  scabrous, 
  and 
  rather 
  numerous. 
  

  

  This 
  species 
  in 
  shape 
  approaches 
  U. 
  zamhoangana, 
  but 
  is 
  much 
  

   narrower, 
  even 
  considermg 
  the 
  difference 
  in 
  the 
  sexes 
  ; 
  frontal 
  furrow 
  

   with 
  parallel 
  instead 
  of 
  converging 
  sides 
  ; 
  the 
  accessory 
  row 
  of 
  granules 
  

   on 
  the 
  lower 
  orbit 
  much 
  shorter 
  and 
  not 
  following 
  the 
  line 
  of 
  the 
  

   orbital 
  margin. 
  

  

  It 
  also 
  resembles 
  U. 
  arcuata 
  (de 
  Haan), 
  but 
  that 
  species 
  has 
  very 
  

   sinuous 
  side 
  margins 
  and 
  no 
  accessory 
  granules 
  on 
  the 
  lower 
  orbit. 
  

  

  UCA 
  NOV.ffi;GUINEiE, 
  new 
  species. 
  

   Plate 
  76. 
  

  

  Type-locality.—New 
  Guinea; 
  2 
  males, 
  one 
  left-handed, 
  one 
  right- 
  

   handed; 
  received 
  from 
  the 
  Linnean 
  Society, 
  Sydney, 
  New 
  South 
  

   Wales. 
  

  

  Type.— 
  Cd.t. 
  No. 
  6374, 
  U.S.N.M. 
  

  

  Dimensions. 
  — 
  Male, 
  length 
  of 
  carapace 
  9.3 
  mm., 
  width 
  16 
  mm. 
  

  

  Allied 
  to 
  U. 
  gaimardi 
  (Milne 
  Edwards),^ 
  from 
  which 
  it 
  differs 
  in 
  the 
  

   following 
  particulars: 
  Sides 
  of 
  the 
  carapace 
  more 
  strongly 
  convergent, 
  

   so 
  that 
  the 
  lateral 
  angles 
  are 
  narrower, 
  and 
  project 
  more 
  sideways; 
  the 
  

   front 
  is 
  correspondingly 
  narrower, 
  being 
  less 
  than 
  one-fifth 
  of 
  the 
  

   width 
  of 
  the 
  carapace. 
  

  

  While 
  the 
  large 
  cheUped 
  of 
  the 
  male 
  is 
  of 
  the 
  same 
  general 
  pattern 
  

   as 
  in 
  U. 
  gaimardi, 
  the 
  palm 
  lacks 
  the 
  deep 
  triangular 
  depression 
  at 
  the 
  

   base 
  of 
  the 
  index, 
  so 
  characteristic 
  of 
  that 
  species; 
  the 
  granulation 
  

   is 
  finer; 
  the 
  furrow 
  just 
  below 
  the 
  superior 
  marginal 
  line 
  of 
  granules 
  

   is 
  not 
  deeply 
  impressed; 
  the 
  oblique 
  ridge 
  on 
  the 
  inner 
  surface 
  is 
  

   more 
  prominent 
  and 
  marked 
  with 
  a 
  single 
  row 
  of 
  about 
  eight 
  large 
  

   granules 
  and 
  several 
  smaller 
  ones; 
  as 
  in 
  gaimardi 
  the 
  slender 
  fingers 
  

   are 
  devoid 
  of 
  a 
  groove 
  on 
  the 
  outer 
  surface, 
  and 
  the 
  index 
  has 
  a 
  tooth 
  

   at 
  its 
  middle 
  and 
  a 
  smaller 
  one 
  near 
  the 
  tip 
  ; 
  the 
  dactylus, 
  mstead 
  of 
  

   two 
  enlarged 
  denticles 
  dividing 
  it 
  into 
  three 
  subequal 
  spaces, 
  has 
  

   three 
  denticles, 
  one 
  of 
  which 
  is 
  not 
  far 
  from 
  the 
  tip, 
  and 
  the 
  space 
  

   proximal 
  to 
  which 
  is 
  divided 
  into 
  three 
  subequal 
  spaces. 
  

  

  In 
  the 
  shape 
  of 
  the 
  carapace 
  this 
  species 
  approaches 
  U. 
  triangularis 
  

   CMilne 
  Edwards), 
  but 
  that 
  species 
  has 
  the 
  sides 
  stiU 
  more 
  conver- 
  

   gent, 
  the 
  anterior 
  border 
  of 
  the 
  front 
  more 
  truncate, 
  the 
  movable 
  

   finger 
  longitudinally 
  grooved. 
  

  

  A 
  young 
  left-handed 
  male 
  from 
  Zamboanga, 
  Mindanao, 
  Phihppine 
  

   Islands, 
  Dr. 
  E. 
  A. 
  Mearns, 
  collector, 
  December, 
  1903, 
  probably 
  be- 
  

   longs 
  to 
  this 
  species. 
  Carapace 
  5.8 
  by 
  9.6 
  mm. 
  Front 
  about 
  one- 
  

   fifth 
  width 
  of 
  carapace, 
  its 
  lower 
  edge 
  a 
  Httle 
  straighter 
  than 
  in 
  the 
  

   typical 
  specimens; 
  inner 
  and 
  lower 
  margins 
  of 
  arm 
  of 
  large 
  chehped 
  

  

  » 
  aelanmus 
  Oaimardi 
  Milne 
  Edwards, 
  Ann. 
  Sci. 
  Nat., 
  Zool. 
  (3), 
  vol. 
  18, 
  1862, 
  p. 
  150 
  1114], 
  pi. 
  4, 
  fig. 
  17. 
  

  

  