383 
Colour  (in  alcohol),  head  and  antennœ  olivaceo-piceous ,  labrum  fer- 
ruginous; legs  fuscous,  flavo-annulate ,  the  extremities  of  each  seg- 
ment being  flavous;  the  rest  of  the  body  jet  black,  the  anterior 
portion  of  the  segments  above  being  olivaceo-cinereous. 
Body  moderately  robust,  or  nearly  parallel  sided. 
Head  smooth  and  shining ,  lower  portion  only  very  lightly  rugutose  ; 
vertex  marked  by  a  deep  sulcus;  6  punctures  above  the  labral  exci- 
sion; upper  surface  of  head  beneath  the  collum  furnished  with  a  trans- 
verse ridge  of  close  set  striae;  eyes  separated  by  a  space  which  is 
equal  to  at  least  a  diameter  and  a  half,  each  composed  of  about  48 
or  50  ocelli;  antennœ  short,  not  projecting  as  far  as  the  hind  border 
of  the  collum  in  9  and  only  just  beyond  it  in  c?. 
Somites  almost  wholly  smooth  and  exceedingly  polished;  the  collum 
wide  laterally,  with  its  anterior  and  posterior  borders  very  lightly 
concave,  the  anterior  angle  thickened  and  a  little  produced  (a  little 
more  in  the  cT  than  in  the  Ç),  posterior  angle  nearly  square,  the 
inferior  border  and  the  anterior  as  high  as  the  eye,  defined  by  a  sul- 
cus ,  with  two  or  one  posterior  abbreviated  sulci  and  ridges ,  the  rest 
of  the  segments  divided  by  a  faintly  marked  transverse  sulcus  (some- 
times obsolete);  the  anterior  part  concentrically  striated  in  front,  the 
posterior  part  longitudinally  striated  below;  pores  minute,  situated 
just  behind  the  transverse  sulcus  ;  ventral  grooves  very  long  and  narrow, 
equalling  in  length  the  two  basal  segments  of  the  legs.  Anal  somite 
produced  above  into  a  simple  straight,  short,  blunt,  subcylindrical 
process  projecting  a  little  beyond  the  upper  angles  of  the  valves; 
valves  large,  convex,  with  borders  very  convex,  strongly  compressed 
throughout  their  length,  projecting  behind  further  than  the  caudal 
process;  sternite  strongly  angled  behind,  fused  with  the  inferior  exten- 
sion of  the  tergite. 
Number  of  somites  in  68,  in  9  66.  Length  up  to  about  190  mm. 
Copulatory  feet  (vide  figure). 
82.  Thyropygus  xanthurus,  sp.  n.  Pl.  XXII,  fig.  20-26. 
Sumatra:  Singkarah.  Two  specimens. 
9.  Colour  (in  alcohol);  head  olivaceo-fuscous  above,  ferruginous 
beneath  the  antennae;  antennœ  pale  fuscous  with  the  distal  end  of 
each  segment  flavo-annulate;  legs  clear  flavous  with  the  basal  segments 
only  brunneous;  somites  with  anterior  half  ochraceo-cinereous,  posterior 
