385 
with  a  single  larger  rufous  or  flavous  spot  on  each  side  behind  the 
pore ,  and  with  sometimes  faint  traces  of  a  median  dorsal  spot  of  the 
same  colour;  anal  somite  paler,  the  posterior  half  of  the  valves  and 
sometimes  the  caudal  process  being  ferruginous. 
Head  smooth  and  shining;  vertex  sulcate;  with  a  fine  transverse 
series  of  striae;  with  two  or  three  small  labral  punctures  on  each 
side;  eyes  separated  by  a  distance  a  little  greater  than  a  diameter, 
composed  of  about  80  ocelli.  Antennoe  in  9  reaching  just  beyond  the 
collum,  in  the  çf  reaching  beyond  the  second  somite. 
Somites  smooth  and  polished  ;  collum  moderately  narrowed  laterally, 
its  anterior  angle  square  in  the  cT  with  thickened  margin,  obtuse  in 
the  9  with  margin  of  the  same  thickness  throughout;  its  posterior 
margin  lightly  concave,  more  so  in  the  gT  than  in  the  9,  almost 
without  stria?.  The  transverse  sulcus  of  the  other  somites  feeble,  some- 
times almost  obsolete  dorsally,  the  anterior  portion  concentrically  striate 
in  front,  the  posterior  portion  longitudinally  striate  inferiorly;  pores 
minute,  situated  in  a  sinuation  of  the  transverse  sulcus  ;  ventral  grooves 
long,  but  scarcely  as  long  as  the  two  basal  segments  of  the  legs. 
Anal  somite  produced  above  into  a  relatively  slender,  pointed,  apically 
upcurled  caudal  process  which  projects  beyond  the  anal  valves  ;  valves 
convex,  with  compressed,  convex  border;  sternite  angled  behind  and 
fused  with  the  preceding  sclerite. 
Number  of  somites  in  9  69-71 ,  in  68  :  length  up  to  about 
200  mm. 
The  single  specimen  obtained  at  Muka-Muka  is  a  small  9  measuring 
only  about  109  mm.  in  length  but  being  provided  with  71  somites; 
the  colour  of  this  example  is  paler  and  the  median  dorsal  series  of 
spots  is  more  pronounced,  moreover  the  anal  somite  appears  to  be 
larger  in  proportion  than  in  large  examples. 
84.  Thyropygus  pachyurus  sp.  n.  Pl.  XXII,  21  — 21b. 
Sumatra:  Manindjau  and  Muka-Muka. 
Colour  (in  alcohol)  ;  head  olivaceo-fuscous  above,  ferruginous  beneath  ; 
legs  and  antennae  flavous,  a  little  darker  at  the  base  ;  somites  olivaceo- 
piceous,  with,  ferruginous  posterior  borders  and  olivaceo-cinereous 
anterior  half,  anterior  border  of  collum  ferruginous;  caudal  process, 
posterior  border  of  sides  of  tergite  and  margins  of  valves  flavous. 
Head  and  face  smooth  and  polished ,  vertex  with  conspicuous  sulcus, 
