89 
Tergites  granular  throughout,  more  coarsely  behind  than  in  front, 
with  a  single  median  keel. 
Sternites;  the  first  three  entirely  smooth,  the  fourth  very  feebly 
granular  laterally,  the  fifth  finely  granular  throughout,  except  in  the 
middle  in  front,  and  furnished  with  four  granular  keels,  the  external 
of  which  are  abbreviated  in  front  and  behind,  and  the  internal  ab- 
breviated in  front. 
Tail  of  normal  form,  the  1st  segment  furnished  with  the  10  granular 
keels ,  the  2nd ,  3th  and  4th  with  8  granular  keels ,  faint  traces  only  of 
the  median  lateral  keel  being  visible  on  the  2nd,  the  keels  strong  and 
evenly  granular  throughout,  except  in  the  case  of  the  four  superior 
keels  of  the  first  three  segments  in  which  the  posterior  granule  is  the 
largest;  intercarinal  spaces  more  or  less  granular,  the  granules  on  the 
upper  surface  of  the  posterior  segments  showing  a  tendency  to  form 
definite  longitudinal  series  ;  the  5th  segment  with  five  granular  keels,  its 
upper  surface  very  convex ,  being  only  lightly  excavated  in  the  middle. 
Vesicle  somewhat  stout ,  the  spine  under  the  aculeus  strong ,  granularly 
costate  beneath,  aculeus  more  than  half  the  length  of  the  vesicle. 
Palp:  humerus  and  brachium  granular  and  granularly  costate  above, 
smoother  beneath;  manus  furnished  above  with  distinct  granular  keels, 
granular  in  front,  smooth  beneath,  rounded,  a  little  narrower  than  the  bra- 
chium, hand -back  more  than  half  the  length  of  the  movable  digit  ;  digits 
evenly  curved,  the  external  and  internal  series  of  teeth  composed  of  7. 
Legs  anteriorly  granular  and  costate. 
Pectines  short,  furnished  with  10—12  (usually  11)  teeth. 
Measurements  in  millimetres  of  largest  specimen.  Total  length  33.5  ; 
length  of  céphalothorax  3.8  ;  of  tail  19,  of  1st  segm.  2,  of  2*d  2.8,  of  3^d  3, 
of  4th  3.5,  of  5th  4.3,  of  vesicle  2,  of  aculeus  1.5;  width  of  1st  segm. 
1.8,  of  5th  1.4,  of  vesicle  1.3,  height  of  vesicle  1.4;  Palp:  length  of 
humerus  3,  of  brachium  3.5,  of  hand-back  2.5,  of  movable  digits  3.9; 
width  of  humerus  1.2,  of  brachium  1.7,  of  manus  1.5. 
This  species  is  closely  related  to  I.  maculatus ,  melanodactylus ,  and 
assamensis1  but  certainly  differs  from  them  all. 
Unfortunately  only  the  female  of  it  is  known  ;  comparisons  with  the 
other  species  must  consequently  be  limited  to  the  members  of  this  sex. 
From  maculatus  it  may  at  once  be  recognised  by  a  marked  diffe- 
rence in  colouring,  the  whole  creature  being  much  more  deeply  fus- 
