342 
segments  of  the  mandibles  very  conspicuous  laterally.  Gnathochilarium 
resembling  in  plan  that  of  e.  g.  Craspedosoma  (cf.  figure). 
First  tergite,  wider  than  the  head  but  slightly  narrower  than  or 
about  as  wide  as  the  head  and  mandibles. 
The  rest  of  the  segments  strongly  convex  above,  furnished  with 
large  slightly  depressed,  anteriorly  shouldered  keels,  which  rise  just 
below  the  middle  of  the  side;  the  keel-bearing  part  of  the  segments 
covered  with  short  pale  hairs  and  furnished  with  the  usual  six  seti- 
ferous  tubercles,  two  of  these  are  close  together  on  the  dorsal  part, 
the  other  is  situated  near  the  middle  of  the  lateral  border  of  the  keel; 
setae  short  clavate;  there  is  a  transverse  granular  ridge  in  front  of  the 
posterior  border;  the  cylindrical  part  of  the  segments,  with  a  deep 
transverse  groove  behind ,  the  anterior  part  elevated  and  densely  gra- 
nular or  finely  ridged.  Anal  tergite  wider  than  long,  not  carinate, 
with  the  six  granules  along  its  posterior  border;  sternite  triangular. 
Copulatory  feet  of  the  cf  somewhat  simple  ;  the  two  pairs  of  appendages 
of  the  7th  segment  modified;  both  these  appendages  have  lost  their  three 
distal  segments  and  the  femora  of  the  1st  pair  are  much  inflated;  from 
the  coxge  of  both  pairs  springs  a  downwardly  directed  process  and  an 
additional  process  springs  from  the  front  of  the  first  pair  of  appendages. 
Femur  of  the  5th  leg  in  front  of  the  copulatoryapparatus  modified. 
39.  Heterochordeuma  monticola  sp.  n.  Pl.  XIX,  fig.  14  — 14Ä. 
Sumatra:  Mount  Singalang.  Several  specimens. 
Colour  fuscous,  paler  beneath,  head  black,  the  hairs  of  the  dorsal  sur- 
face white. 
Head  smooth  above,  hairy  below.  Eyes  sub-circular,  composed  of 
9-10  not  contiguous  ocelli,  arranged  in  three  vertical  series.  An- 
tennae shorter  than  in  H.  doriae,  the  shortness  especially  affecting 
the  3rd  and  segments. 
The  segments  resembling  those  of  H.  doriae  in  build  but  the  keels 
are  distinctly  slenderer,  with  the  anterior  angle  of  the  lateral  border 
less  convex. 
The  legs  are  shorter  than  in  H.  doriae  and  the  trochanter  and 
femur  are  subequal  in  length;  claw  longish. 
Copulatory  feet  completely  external ,  cut  off  at  the  femur ,  this  seg- 
ment in  the  anterior  pair  strongly  inflated  (cf.  figure). 
Length  6  mm. 
